PLEDGE AND SECURITY AGREEMENT


                  PLEDGE  AND  SECURITY  AGREEMENT,  dated as of April 1,  1997,
among Triton Aviation  Services V LLC, a California  limited  liability  company
("Borrower"),  Triton Aviation Services Limited, a Bermuda corporation ("TASL"),
the other parties  executing the signature  pages hereto as pledgors  (Borrower,
TASL,  and  such  other  parties,  collectively,  "Pledgors"  and  each  of them
individually  a  "Pledgor")  and Polaris  Aircraft  Income Fund V, a  California
limited partnership ("Lender").

                                R E C I T A L S:

                  WHEREAS, Pledgors are the sole members of Borrower; and

                  WHEREAS,  Pledgors are the record and beneficial owners of the
membership  interests described in Schedule I hereto (the "Pledged Interests" of
each such Pledgor) issued by Borrower; and

                  WHEREAS,  Borrower  has  executed  and  delivered  to Lender a
Promissory Note (as the same may be amended,  modified or supplemented from time
to time,  the  "Note"),  pursuant to the  Purchase,  Assignment  and  Assumption
Agreement, dated as of April 1, 1997 (the "Purchase Agreement"),  between Lender
and Borrower; and

                  WHEREAS,  Pledgors,  as the sole  members  of  Borrower,  will
derive  substantial  direct and indirect  economic benefit from the transactions
contemplated  by the Purchase  Agreement and the delivery of the Note to Lender;
and

                  WHEREAS,  in  connection  with  the  making  of  the  Purchase
Agreement  and  the  delivery  of  the  Note  and  as  security  for  all of the
Obligations, Lender is requiring that Pledgors shall have executed and delivered
this  Pledge  and  Security   Agreement   and  granted  the  security   interest
contemplated hereby;

                  NOW,  THEREFORE,  in  consideration  of the  premises  and the
covenants  hereinafter contained the receipt and sufficiency of which are hereby
agreed and  acknowledged  and to induce  Lender to provide the seller  financing
evidenced by the Note, it is agreed as follows:







1. Definitions.  Unless otherwise defined herein,  terms defined in the Note are
used herein as therein defined,  and the following shall have (unless  otherwise
provided  elsewhere in this Agreement) the following  respective  meanings (such
meanings  being  equally  applicable to both the singular and plural form of the
terms defined):

                  "Additional  Holder"  shall have the meaning  assigned to such
term in Section 7(d) hereof.

                  "Agreement"  shall mean this  Pledge and  Security  Agreement,
including all  amendments,  modifications  and  supplements  and any exhibits or
schedules to any of the foregoing, and shall refer to this Agreement as the same
may be in effect at the time such reference becomes operative.

                  "Ancillary  Agreements"  shall have the meaning assigned to it
in the Purchase Agreement.

                  "Bankruptcy  Code" shall mean title 11, United States Code, as
amended from time to time, and any successor statute thereto

                  "Equity  Dividend  Amount"  means,  (i) for any calendar month
that  ends  prior to the  first  Effective  Time to  occur  under  the  Purchase
Agreement,  an amount equal to $64,760 and (ii) for the calendar  month in which
the first  Effective  Time  occurs  under the  Purchase  Agreement  and for each
calendar month thereafter,  the Purchase Agreement, an amount equal to $107,933,
and for any period that is less than a calendar  month, a  proportionate  amount
thereof  calculated  using the same  proportion  that the number of days in such
period bears to thirty days.

                  "General  Intangibles" shall mean all "general intangibles" as
such term is defined in Section 9-106 of the Uniform  Commercial Code, now owned
or hereafter  acquired by any Pledgor relating to the collateral of such Pledgor
pledged hereby.

                  "Governmental  Authority"  shall mean (a) any federal,  state,
provincial or similar government,  and any body, board, department,  commission,
court,  tribunal,  author  ity,  agency  or  other  instrumentality  of any such
government  or  otherwise  exercising  any  executive,  legislative,   judicial,
administrative  or  regulatory  functions  of such  government  or (b) any other
government  entity  having  jurisdiction  over any matter  contemplated  by this
Agreement,  the Purchase Agreement or any other Ancillary Agreements or relating
to the observance or performance of the obligations of any of the parties hereto
or thereto.



                                        2







                  "Interests" shall mean all shares, options,  warrants, general
or limited partnership interests, membership interests,  participations or other
equivalents (regardless of how designated) of or in a corporation,  partnership,
limited  liability  company or equivalent  entity  whether  voting or nonvoting,
including,  without  limitation,  common stock,  preferred  stock,  or any other
"equity  security"  (as such term is defined in Rule 3a11-1 of the General Rules
and Regulations  promulgated by the Securities and Exchange Commission under the
Securities Exchange Act of 1934, as amended).

                  "Keep Well" shall mean that certain Keep Well Agreement, dated
as of the date hereof, among TASL, Borrower and Lender.

                  "Keep Well  Guaranty"  shall mean that certain  Guaranty (Keep
Well), dated as of the date hereof, among TIL, Lender and Borrower.

                  "Loan  Guaranty"   shall  mean  that  certain   Guaranty  (SPV
Indebtedness), dated as of the date hereof, between TIL and Borrower.

                  "Obligations"  shall  mean  (i) all  loans,  advances,  debts,
liabilities and  obligations,  for monetary amounts (whether or not such amounts
are liquidated or determinable)  owing by Borrower to Lender,  and all covenants
and duties  regarding  such amounts,  of any kind or nature,  present or future,
whether or not  evidenced by any note,  agreement or other  instrument,  arising
under the Purchase  Agreement or the Note  including,  without  limitation,  all
interest, fees, charges, expenses,  attorneys' fees and any other sum chargeable
to Borrower under the Purchase  Agreement or the Note,  (ii) all  obligations of
any kind or nature,  present or future,  of TASL under the Keep Well,  (iii) all
obligations of any kind or nature, present or future, of TIL under the Keep Well
Guaranty and (iv) all obligations of any kind or nature,  present or future,  of
TIL under the Loan Guaranty.

                  "Person"  shall  mean  any  individual,  sole  proprietorship,
partnership,  limited liability company,  joint venture,  trust,  unincorporated
organization, association, corporation, institution, public benefit corporation,
entity or  government  (whether  Federal,  state,  county,  city,  municipal  or
otherwise, including, without limitation, any instrumentality, division, agency,
body or department thereof).


                  "Pledged  Collateral"  shall have the meaning assigned to such
term in Section 2 hereof.



                                        3







                  "Pledged  Interests"  shall have the meaning  assigned to such
term in the recitals hereof.

                  "Secured  Obligations" shall have the meaning assigned to such
term in Section 3 hereof.

                  "Termination   Date"   shall   mean  the  date  on  which  all
determinable and liquidated Obligations have been completely discharged.

                  "TIL"  shall  mean  Triton  Investments   Limited,  a  Bermuda
corporation.

                  "Transferee"  shall have the meaning  assigned to such term in
Section 7(d) hereof.

                  "Uniform  Commercial  Code" shall mean the Uniform  Commercial
Code  as the  same  may,  from  time to  time,  be in  effect  in the  State  of
California;  provided,  however,  in the event  that,  by  reason  of  mandatory
provisions  of law,  any or all of the  attachment,  perfection  or  priority of
Lender's  security  interest  in any  Collateral  is  governed  by  the  Uniform
Commercial  Code  as in  effect  in a  jurisdiction  other  than  the  State  of
California, Uniform Commercial Code shall mean the Uniform Commercial Code as in
effect in such other jurisdiction for purposes of the provisions hereof relating
to such  attachment,  perfec tion or priority  and for  purposes of  definitions
related to such provisions.

                  2. Pledge.  Each Pledgor hereby pledges to Lender,  and grants
to Lender,  a first  priority  security  interest in, all of the following  (the
"Pledged Collateral"):

                  (a) in the  case of each  Pledgor  other  than  Borrower,  the
Pledged  Interests  of such  Pledgor  and all  dividends,  distributions,  cash,
instruments  and  other  property  or  proceeds  from  time  to  time  received,
receivable or otherwise distributed by Borrower in respect of or in exchange for
any or all of the Pledged  Interests of such Pledgor;  provided,  however,  that
Pledged  Collateral shall not include any  distributions  made by Borrower which
are permitted to be made by it under Section 7(b) hereof;

                  (b) in the  case of each  Pledgor  other  than  Borrower,  all
additional  Interests  issued by Borrower  to such  Pledgor or from time to time
acquired by such Pledgor in any manner  (which  Interests  shall be deemed to be
part of the Pledged Interests), and the certificates,  if any, representing such
additional Interests,  and all dividends,  distributions,  cash, instruments and
other property or proceeds from time to time  received,  receivable or otherwise
distributed in respect of or in exchange for any or all of such Interests;



                                        4







                  (c) in the case of  Borrower,  all rights under the Keep Well,
the Keep Well Guaranty and the Loan Guaranty;

                  (d) in the case of each Pledgor, all General Intangibles; and

                  (e) all proceeds of any of the foregoing.

                  3. Security for Obligations.  This Agreement secures,  and the
Pledged Collateral is security for, the prompt payment in full when due, whether
at stated  maturity,  by  acceleration  or  otherwise,  and  performance  of the
Obligations, whether for principal, premium, interest, fees, costs and expenses,
and all  obligations of Pledgors now or hereafter  existing under this Agreement
(collectively, the "Secured Obligations").

                  4. Delivery of Pledged Collateral.  All certificates,  if any,
representing or evidencing the Pledged  Interests shall be delivered to and held
by or on behalf of  Lender  pursuant  hereto  and shall be  accompanied  by duly
executed  instruments  of  transfer  or  assignment  in  blank,  all in form and
substance  satisfactory  to Lender.  Lender shall have the right, at any time in
its discretion and without notice to Pledgors,  to transfer to or to register in
the  name of  Lender  or any of its  nominees,  as  pledgees,  any or all of the
Pledged  Interests.  In  addition,  Lender  shall  have the right at any time to
exchange   certificates  or  instruments   representing  or  evidencing  Pledged
Interests for certificates or instruments of smaller or larger denominations.

                  5. Representations and Warranties. Each Pledgor represents and
warrants to Lender that:

                  (a)  Such  Pledgor  is,  and at the  time of  delivery  of the
Pledged  Interests  to Lender  pursuant  to  Section 4 hereof  will be, the sole
holder of record and the sole beneficial owner of the Pledged Collateral pledged
by such  Pledgor  free and  clear of any Lien  thereon  or  affecting  the title
thereto, except for the Lien created by this Agreement.

                  (b) All of the Pledged  Interests  of such  Pledgor  have been
duly authorized, validly issued and are fully paid and nonassessable.




                                        5







                  (c) Such  Pledgor  has the right and  requisite  authority  to
pledge, assign,  transfer,  deliver, deposit and set over the Pledged Collateral
pledged by such Pledgor to Lender as provided herein.

                  (d) None of the  Pledged  Interests  of such  Pledgor has been
issued or transferred in violation of the  securities  registration,  securities
disclosure  or  similar  laws of any  jurisdiction  to which  such  issuance  or
transfer may be subject.

                  (e)  As  of  the  date  hereof,  the  authorized,  issued  and
outstanding  Interests of Borrower  consist solely of the  membership  interests
that are  described in Schedule I hereto.  As of the date  hereof,  there are no
existing  options,  warrants,  calls or commitments of any character  whatsoever
relating  to any  Interests  of  Borrower  other  than as set forth on Exhibit A
hereto.

                  (f) No consent, approval,  authorization or other order of any
Person  and no  consent,  authorization,  approval,  or other  action by, and no
notice to or filing  with,  any  Governmental  Authority,  other than as already
obtained,  given or filed,  is required by Pledgor  either (i) for the pledge by
such  Pledgor of the Pledged  Collateral  pursuant to this  Agreement or for the
execution, delivery or performance of this Agreement or the Ancillary Agreements
to which such  Pledgor is a party,  by such  Pledgor or (ii) for the exercise by
Lender of the  voting or other  rights  provided  for in this  Agreement  or the
remedies in respect of the Pledged Collateral pursuant to this Agreement, except
as may be required in connection  with such  disposition  by laws  affecting the
offering and sale of securities generally.

                  (g)  The  pledge,  assignment  and  delivery  of  the  Pledged
Collateral pursuant to this Agreement will create a valid first priority lien on
and a first  priority  perfected  security  interest in the  Pledged  Collateral
pledged by such Pledgor,  and the proceeds thereof,  securing the payment of the
Secured Obligations.

                  (h) This Agreement and the Ancillary  Agreements to which such
Pledgor is a party have been duly  authorized,  executed  and  delivered by such
Pledgor and  constitute  legal,  valid and binding  obligations  of such Pledgor
enforceable  in accordance  with their terms,  except as  enforceability  may be
limited by bankruptcy, insolvency, or other similar laws affecting the rights of
creditors generally or by the application of general equity principles.

                  (i)      Borrower has no subsidiaries.



                                        6







                  The representations and warranties set forth in this Section 5
shall survive the execution and delivery of this Agreement.

                  6.       Covenants.

                  (a) Each Pledgor  jointly and  severally  covenants and agrees
that until the Termination Date:

                           (i)  Subject  to  Section  7(d),  without  the  prior
         written  consent  of  Lender,  such  Pledgor  will  not  sell,  assign,
         transfer,  pledge or otherwise  encumber any of its rights in or to the
         Pledged  Collateral  pledged by such Pledgor or any unpaid dividends or
         other distributions or payments with respect thereto or grant a Lien in
         any therein.

                           (ii) Such  Pledgor  will,  at its  expense,  promptly
         execute, acknowledge and deliver all such instruments and take all such
         action as Lender from time to time may  reasonably  request in order to
         ensure  to  Lender  the  benefits  of the  Liens in and to the  Pledged
         Collateral  intended  to be created by this  Agreement,  including  the
         filing of any necessary Uniform  Commercial Code financing  statements,
         which may be filed by Lender  with or  without  the  signature  of such
         Pledgor,  and will cooperate with Lender, at such Pledgor's expense, in
         obtaining all necessary governmental approvals and making all necessary
         filings under federal or state law in connection with such Liens or any
         sale or transfer of the Pledged Collateral.

                           (iii) Such  Pledgor  has and will defend the title to
         the  Pledged  Collateral  and the Liens of Lender  thereon  against the
         claim of any Person and will maintain and preserve such Liens until the
         Termination Date.

                           (iv) Each of them will, upon obtaining any additional
         Interest of Borrower, which Interest is not already Pledged Collateral,
         promptly  (and in any event within three (3) business  days) deliver to
         Lender  a  Pledge  Amendment,   duly  executed  by  such  Pledgor,   in
         substantially the form of Schedule II hereto (a "Pledge Amendment"), in
         respect of the  additional  Pledged  Interests  which are to be pledged
         pursuant to this Agreement.  Each Pledgor hereby  authorizes  Lender to
         attach  each Pledge  Amendment  to this  Agreement  and agrees that all
         Pledged  Interests listed on any Pledge  Amendment  delivered to Lender
         shall for all purposes hereunder be considered Pledged Collateral.



                                        7







                           (v) None of them will take any action to amend, alter
         or change  Borrower's articles  of organization or  operating agreement
         (other than amendments  permitted  under the Note),  the Keep Well, the
         Keep Well  Guaranty or the Loan  Guaranty or permit  Borrower to repeal
         its articles of organization.

                           (vi)  None of them will take any  action  that  would
         authorize  or permit  Borrower to take any of the actions  specified in
         Paragraph 2.4 of its operating agreement.

                           (vii) TASL  covenants  and agrees  that it will cause
         Borrower  to comply  with the  terms of and  limitations  contained  in
         Borrower's articles of organization or in its operating agreement.

                  (b) TASL  shall  deliver to Lender  written  notice of (i) any
payments made by it to Borrower  pursuant to the Keep Well and (ii) any dividend
or distribution received by it from Borrower other than Equity Dividend Amounts,
in each case no later than three (3) business days after disbursing such payment
or the receipt of any such dividend or distribution, as applicable.

                  (c) TASL covenants and agrees that it will at all times during
the term of this Agreement maintain  management  personnel who are qualified and
competent to manage and direct the business and  operations  of Borrower and who
have experience in the commercial aviation industry.

                  (d) TASL  covenants  and agrees  that,  at all  times,  Triton
Members  shall  hold,  in the  aggregate,  at least fifty  percent  (50%) of the
Economic Interests of Borrower. TASL covenants and agrees that, at all times, it
shall be the sole  manager of Borrower and shall have all  responsibilities  and
duties allocated to TASL as manager of Borrower pursuant to Borrower's operating
agreement  or  articles of  organization  and shall not make any  delegation  or
assignment  to any  other  Person  of  such  responsibility  or duty  except  as
permitted thereby.

                  7.  Pledgors'  Rights.  (a) As long as no  Default or Event of
Default shall have occurred and be continuing  and until written notice shall be
given to each Pledgor in accordance with Section 8(a) hereof, such Pledgor shall
have the right, from time to time, to vote and give consents with respect to the
Pledged  Collateral or any part thereof for all purposes not  inconsistent  with
the provisions of this Agreement, the Note or any Ancillary Agreement; provided,
however,  that no vote shall be cast,  and no  consent  shall be given or action
taken,  which  would have the effect of  impairing  the  position or interest of



                                        8






Lender in respect of the Pledged  Collateral or which would  authorize or effect
(i) the dissolution or liquidation,  in whole or in part, of Borrower,  (ii) the
consolidation  or merger of  Borrower  with any other  Person,  (iii)  except as
permitted under this Agreement or the Note, the sale, disposition or encumbrance
of all or substantially all of the assets of Borrower,  (iv) except as permitted
by Section 7(d) hereof and Section 4.4 of the Note, any change in the authorized
number of  Interests  or the stated  capital of Borrower and the issuance of any
additional  Interests,  (v) the  alteration of the voting rights with respect to
the Interests of Borrower,  or (vi) any change,  alteration or  modification  of
Borrower's articles of organization,  operating agreement (other than amendments
permitted  under the Note,  the Keep Well,  the Keep Well  Guaranty  or the Loan
Guaranty.

                  (b) No Pledgor  shall be  entitled  to collect and receive any
dividend or other  distribution paid in respect of the Pledged Interests whether
paid or payable in cash,  instruments or other property other than (1) beginning
as of April 1, 1997,  payable in the next calendar  month,  the Equity  Dividend
Amount  and any  accrued  and  unpaid  Equity  Dividend  Amount  for each  month
thereafter, (2) with respect to TASL only, amounts equal to equity contributions
made by TASL pursuant to the Keep Well which have not been  previously  recouped
through the payment of any dividend or  distribution by Borrower and (3) amounts
equal to any  reduction  of the Cash Amount  pursuant to Section 4(c) or Section
4(d)(ii) of the Purchase Agreement; provided, however, that during any period in
which any  payment  under the Note is overdue or a Default has  occurred  and is
continuing,  no Pledgor shall be entitled to collect and receive any dividend or
other  distribution  whatsoever  but Borrower may continue to accrue a liability
equal to the Equity  Dividend  Amount  during such period and  Borrower may make
payments in respect of any such accrued  liability so long as no amounts due and
payable under the Note are overdue and no Default thereunder is continuing,  and
provided,  further,  that any permitted dividends or distributions in respect of
the Pledged  Interests shall be paid only to the extent  permitted by applicable
law.

                  (c) Other than  dividends  and  distributions  permitted to be
received by a Pledgor  pursuant to subsection (b) above,  all dividends or other
distributions paid in respect of any of the Pledged Interests,  whenever paid or
made,  shall be delivered to Lender to hold as Pledged  Collateral and shall, if
received by such  Pledgor,  be  received in trust for the benefit of Lender,  be
segregated  from the other  property or funds of such Pledgor,  and be forthwith
delivered to Lender as Pledged  Collateral in the same form as so received (with
any necessary endorsement).



                                        9







                  (d) (i)  Borrower  shall  be  permitted  to  issue  additional
Interests to any Person (each,  an "Additional  Holder") and (ii) each member of
Borrower shall be permitted to sell or otherwise  transfer Pledged  Interests to
any Person  (each,  a  "Transferee");  provided,  in each case that after giving
effect to any such  issuance or  transfer  (A) the number of members of Borrower
who are not Triton  Members  shall not exceed  three (3) as a result of any such
issuance or transfer,  (B) the Triton Members shall hold, in the  aggregate,  at
least 50% of the Economic  Interests of Borrower,  (C) the Additional  Holder or
Transferee  of such  equity  interest  shall  be a  Qualified  Holder,  (D) such
Additional  Holder or  Transferee  shall  expressly  agree to the pledge of such
Interests  under  this  Agreement  and to be bound by the terms  and  conditions
hereof by delivery of a duly executed Pledge Amendment,  and (E) after notice to
Lender by the  applicable  Pledgor,  pursuant to the terms of Section 19 hereof,
Lender  shall  consent to such  transfer  or  issuance,  such  consent not to be
unreasonably  withheld;  provided,  however,  that if Lender does not respond to
such notice  within ten (10) days after  receipt by Lender of such notice,  such
consent shall be deemed granted. Notwithstanding the foregoing, no such issuance
or transfer  shall be permitted if such  issuance or transfer  would violate any
applicable law or cause the Aircraft owned, directly or indirectly,  by Borrower
then registered  under the Act to no longer be eligible for  registration  under
the Act.

                  8. Defaults and Remedies.  (a) Upon the occurrence of an Event
of Default and during the continuation of such Event of Default,  then or at any
time  after  the  declaration  of such  Event of  Default  (provided  that  such
declaration  is not  rescinded by Lender) and following  written  notice to each
Pledgor,  Lender  (personally  or  through  an agent) is hereby  authorized  and
empowered to transfer and register in its name or in the name of its nominee the
whole or any part of the Pledged Collateral,  to exercise the voting rights with
respect  thereto,  to collect and receive all dividends and other  distributions
made  thereon,  to sell in one or more sales after seven (7) days' notice of the
time and place of any public sale or of the time after  which a private  sale is
to take place (which notice each Pledgor agrees is commercially reasonable), but
without  any  previous  notice  or  advertisement,  the whole or any part of the
Pledged  Collateral and to otherwise act with respect to the Pledged  Collateral
as though Lender was the outright owner thereof, each Pledgor hereby irrevocably
constituting  and appointing  Lender as the proxy and  attorney-in-fact  of such
Pledgor,  with full power of substitution to do so;  provided,  however,  Lender
shall not have any duty to exercise  any such right or to preserve  the same and
shall not be liable  for any  failure to do so or for any delay in doing so. Any
sale shall be made at a public or private sale at Lender's place of business, or
at any public  building in the City and County of San  Francisco or elsewhere to
be named in the  notice of sale,  either  for cash or upon  credit or for future
delivery at such price as Lender may deem fair,  and Lender may be the purchaser
of the  whole or any part of the  Pledged  Collateral  so sold and hold the same



                                       10







thereafter  in its own right free from any claim of such Pledgor or any right of
redemption.  Each sale shall be made to the highest bidder,  but Lender reserves
the right to reject any and all bids at such sale which, in its  discretion,  it
shall  deem  inadequate.  Demands of  performance,  except as  otherwise  herein
specifically  provided for, notices of sale,  advertisements and the presence of
property at sale are hereby waived and any sale hereunder may be conducted by an
auctioneer or any officer or agent of Lender.

                  (b) If, at the original  time or times  appointed for the sale
of the whole or any part of the Pledged Collateral, the highest bid, if there be
but  one  sale,  shall  be  inadequate  to  discharge  in full  all the  Secured
Obligations, or if the Pledged Collateral be offered for sale in lots, if at any
of such sales,  the  highest bid for the lot offered for sale would  indicate to
Lender, in its discretion,  the unlikelihood of the proceeds of the sales of the
whole of the Pledged  Collateral  being  sufficient to discharge all the Secured
Obligations,  Lender  may,  on  one or  more  occasions  and in its  discretion,
postpone  any of said  sales by public  announcement  at the time of sale or the
time of previous  postponement of sale, and no other notice of such postponement
or  postponements  of sale need be given,  any other notice being hereby waived;
provided,  however, that any sale or sales made after such postponement shall be
after seven (7) days' notice to Pledgors.

                  (c) In the event of any sales  hereunder  Lender shall,  after
deducting all costs or expenses of every kind (including  reasonable  attorneys'
fees and disbursements) for care,  safekeeping,  collection,  sale,  delivery or
otherwise,  apply the  residue of the  proceeds  of the sales to the  payment or
reduction,  either in whole or in part, of the Secured Obligations in accordance
with the agreements and instruments  governing and evidencing such  Obligations,
returning the surplus, if any, to Pledgors.

                  (d) If, at any time when Lender  shall  determine  to exercise
its right to sell the  whole or any part of the  Pledged  Collateral  hereunder,
such Pledged Collateral or the part thereof to be sold shall not, for any reason
whatsoever,  be  effectively  registered  under the  Securities  Act of 1933, as
amended (or any similar statute then in effect) (the "Act"),  Lender may, in its
discretion  (subject only to applicable  requirements of law), sell such Pledged
Collateral  or part  thereof  by  private  sale in such  manner  and under  such
circumstances  as Lender may deem  necessary  or  advisable,  but subject to the
other  requirements  of this Section 8, and shall not be required to effect such
registration  or  to  cause  the  same  to be  effected.  Without  limiting  the
generality of the foregoing, in any such event Lender in its discretion (x) may,
in accordance with applicable securities laws, proceed to make such private sale
notwithstanding  that a  registration  statement for the purpose of  registering
such Pledged  Collateral or part thereof could be or shall have been filed under



                                       11







the Act, (y) may  approach and  negotiate  with a single  possible  purchaser to
effect  such  sale  and (z) may  restrict  such  sale to a  purchaser  who  will
represent and agree that such purchaser is purchasing  for its own account,  for
investment  and not  with a view  to the  distribution  or sale of such  Pledged
Collateral or part thereof.  In addition to a private sale as provided  above in
this  Section  8,  if  any  of  the  Pledged  Collateral  shall  not  be  freely
distributable  to the public without  registration  under the Act at the time of
any proposed  sale pursuant to this Section 8, then Lender shall not be required
to  effect  such  registration  or cause  the same to be  effected  but,  in its
discretion  (subject only to applicable  requirements  of law), may require that
any sale  hereunder  (including  a sale at  auction)  be  conducted  subject  to
restrictions  (i) as to the financial  sophistication  and ability of any Person
permitted to bid or purchase at any such sale, (ii) as to the content of legends
to be placed upon any certificates  representing the Pledged  Collateral sold in
such sale,  including  restrictions on future transfer thereof,  (iii) as to the
representations required to be made by each Person bidding or purchasing at such
sale relating to that Person's  access to financial  information  about Pledgors
and such Person's intentions as to the holding of the Pledged Collateral so sold
for  investment,  for its own account,  and not with a view to the  distribution
thereof,  and (iv) as to such other  matters as Lender may,  in its  discretion,
deem  necessary  or  appropriate  in order that such sale  (notwithstanding  any
failure so to register) may be effected in compliance  with the Bankruptcy  Code
and other laws affecting the  enforcement  of creditors'  rights and the Act and
all applicable state securities laws.

                  (e) Each  Pledgor  recognizes  that any such  private sale may
result in prices and other terms less  favorable to the seller than if such sale
were a public sale and, notwithstanding such circumstances, agrees that any such
private  sale  shall be deemed to have  been made in a  commercially  reasonable
manner.  Lender  shall  be  under  no  obligation  to delay a sale of any of the
Pledged Collateral for the period of time necessary to permit the  registrant to
register  such  securities  for public sale under the Act,  or under  applicable
state securities laws, even if any Pledgor would agree to do so.

                  (f) Each Pledgor  agrees that  following  the  occurrence  and
during the  continuance  of an Event of  Default it will not at any time  plead,
claim  or  take  the  benefit  of any  appraisal,  valuation,  stay,  extension,
moratorium  or  redemption  law now or hereafter in force in order to prevent or
delay the  enforcement of this  Agreement,  or the absolute sale of the whole or
any part of the Pledged Collateral or the possession thereof by any purchaser at
any sale hereunder,  and each Pledgor waives the benefit of all such laws to the
extent it lawfully  may do so. Each  Pledgor  agrees that it will not  interfere
with any right, power and remedy of Lender provided for in this Agreement or now
or  hereafter  existing at law or in equity or by statute or  otherwise,  or the



                                       12







exercise  or  beginning  of the  exercise  by  Lender of any one or more of such
rights,  powers  or  remedies.  No  failure  or delay on the part of  Lender  to
exercise  any such right,  power or remedy and no notice or demand  which may be
given to or made upon any  Pledgor by Lender with  respect to any such  remedies
shall operate as a waiver thereof, or limit or impair Lender's right to take any
action or to exercise any power or remedy  hereunder,  without notice or demand,
or prejudice its rights as against any Pledgor in any respect.

                  (g) Each  Pledgor  further  agrees that a breach of any of the
covenants  contained in this Section 8 will cause irreparable  injury to Lender,
that  Lender has no  adequate  remedy at law in respect of such breach and, as a
consequence,  agrees that each and every  covenant  contained  in this Section 8
shall be specifically  enforceable against such Pledgor, and such Pledgor hereby
waives  and agrees not to assert  any  defenses  against an action for  specific
performance of such covenants except for a defense that the Secured  Obligations
are not then due and payable in accordance  with the agreements and  instruments
governing and evidencing such obligations.

                  9. Application of Proceeds. Any cash held by Lender as Pledged
Collateral  and all cash proceeds  received by Lender in respect of any sale of,
liquidation  of,  or  other  realization  upon  all or any  part of the  Pledged
Collateral  or  pursuant to Section  8(g)  hereof  shall be applied by Lender as
follows:

                  (a) First,  to the  payment of the costs and  expenses of such
sale,  including  reasonable  compensation to Lender and its agents and counsel,
and all  expenses,  liabilities  and  advances  made or  incurred  by  Lender in
connection therewith;

                  (b)      Next, to the payment of the Secured Obligations; and

                  (c) Finally, after payment in full of all Secured Obligations,
to the payment to Pledgors, or their successors or assigns, or to whomsoever may
be lawfully entitled to receive the same or as a court of competent jurisdiction
may direct, of any surplus then remaining from such proceeds.

                  10. Waiver.  No delay on Lender's part in exercising any power
of sale, Lien,  option or other right  hereunder,  and no notice or demand which
may be given to or made upon  Pledgors  by Lender  with  respect to any power of
sale, Lien, option or other right hereunder,  shall constitute a waiver thereof,
or limit or impair Lender's right to take any action or to exercise any power of
sale, Lien,  option, or any other right hereunder,  without notice or demand, or
prejudice Lender's rights as against Pledgors in any respect.



                                       13







                  11.  Assignment.  Lender may assign,  endorse or transfer  any
instrument evidencing all or any part of the Secured Obligations as provided in,
and in accordance  with, the Note, the Keep Well, the Keep Well Guaranty and the
Loan  Guaranty,  as  applicable,  and the  holder  of such  instrument  shall be
entitled to the benefits of this Agreement.

                  12.  Termination.  Immediately  following  the  payment of all
Secured Obligations, Lender shall deliver to each Pledgor the Pledged Collateral
pledged  by  such  Pledgor  at the  time  subject  to  this  Agreement  and  all
instruments of assignment  executed in connection  therewith,  free and clear of
the Liens hereof and,  except as  otherwise  provided  herein,  all of Pledgors'
obligations hereunder shall at such time terminate.

                  13. Lien  Absolute.  All rights of Lender  hereunder,  and all
obligations  of  Pledgors   hereunder,   shall  be  absolute  and  unconditional
irrespective of:

                  (a) any lack of validity or  enforceability  of the Note,  the
Purchase Agreement,  the Keep Well, the Keep Well Guaranty, the Loan Guaranty or
any  other   agreement  or  instrument   governing  or  evidencing  any  Secured
Obligations;

                  (b) any change in the time,  manner or place of payment of, or
in any other term of, all or any part of the Secured  Obligations,  or any other
amendment or waiver of or any consent to any departure  from the Note,  the Keep
Well,  the Keep Well  Guaranty,  the Loan  Guaranty  or any other  agreement  or
instrument governing or evidencing any Secured Obligations;

                  (c)  any  exchange,  release  or  nonperfection  of any  other
collateral,  or any release or  amendment  or waiver of or consent to  departure
from any guaranty, for all or any of the Secured Obligations; or

                  (d) any other circumstance which might otherwise  constitute a
defense available to, or a discharge of, any Pledgor.

                  14. Release.  Each Pledgor consents and agrees that Lender may
at any time, or from time to time, in its discretion (a) renew, extend or change
(pursuant to any right to do so provided in the relevant  agreement) the time of
payment,  and/or the manner, place or terms of payment of all or any part of the
Secured Obligations and (b) exchange, release and/or surrender all or any of the
Pledged Collateral,  or any part thereof, by whomsoever deposited,  which is now
or may hereafter be held by Lender in connection  with all or any of the Secured
Obligations;  all in such manner and upon such terms as Lender may deem  proper,



                                       14







and without  notice to or further  assent  from such  Pledgor,  it being  hereby
agreed  that  such  Pledgor  shall be and  remain  bound  upon  this  Agreement,
irrespective  of the  existence,  value  or  condition  of  any  of the  Pledged
Collateral,   and  notwithstanding  any  such  change,   exchange,   settlement,
compromise,  surrender,  release, renewal or extension, and notwithstanding also
that the Secured  Obligations may, at any time,  exceed the aggregate  principal
amount thereof set forth in the Note, the Keep Well, the Keep Well Guaranty, the
Loan Guaranty or any other  agreement  governing any Secured  Obligations.  Each
Pledgor  hereby  waives  notice  of  acceptance  of  this  Agreement,  and  also
presentment,  demand,  protest  and  notice  of  dishonor  of any and all of the
Secured Obligations,  and promptness in commencing suit against any party hereto
or liable  hereon,  and in giving any notice to or of making any claim or demand
hereunder  upon such  Pledgor.  No act or omission of any kind on Lender's  part
shall in any event affect or impair this Agreement.

                  15. Indemnification. Each Pledgor jointly and severally agrees
to indemnify and hold Lender  harmless from and against any taxes,  liabilities,
claims and damages, including reasonable attorney's fees and disbursements,  and
other  expenses  incurred  or arising by reason of the taking or the  failure to
take action by Lender,  in good faith,  in respect of any  transaction  effected
under  this  Agreement  or in  connection  with the Lien  provided  for  herein,
including, without limitation, any taxes payable in connection with the delivery
or  registration  of any of the  Pledged  Collateral  as provided  herein.  Each
Pledgor jointly and severally agrees to promptly reimburse Lender for all actual
reasonable  out-of-pocket  costs and expenses,  including,  without  limitation,
reasonable   counsel  fees,   incurred  by  Lender,   in  connection   with  the
administration  and  enforcement  of this  Agreement  and all  reasonable  fees,
expenses and disbursements,  including the reasonable fees of Lender's agents or
representatives,  incurred in connection with any lien searches and filings made
by Lender, any amendments hereto or waivers or modifications  hereof;  provided,
however,  that  Pledgors  shall not be  obligated  to pay any costs or  expenses
(including attorney's fees) incurred by Lender in connection with preparation of
this Agreement or any other Ancillary  Agreement or any ordinary  administrative
costs and expenses of Lender in the absence of a Default by Borrower  under this
Agreement, the Note or any other Ancillary Agreement or a Default by any Pledgor
under this Agreement or any other Ancillary  Agreement;  and provided,  further,
that  nothing  contained  herein  shall limit or be deemed to limit any right of
Borrower under Section 13 of the Purchase Agreement. The obligations of Pledgors
under this Section 15 shall survive the termination of this Agreement.

                  16.  Reinstatement.  This Agreement shall remain in full force
and effect and  continue  to be  effective  should any  petition  be filed by or
against any Pledgor for liquidation or reorganization, should any Pledgor become



                                       15







insolvent  or make an  assignment  for the  benefit  of  creditors  or  should a
receiver  or  trustee  be  appointed  for  all or any  significant  part  of any
Pledgor's  assets,  and shall continue to be effective or be reinstated,  as the
case may be, if at any time payment and performance of the Secured  Obligations,
or any part thereof,  is,  pursuant to applicable  law,  rescinded or reduced in
amount,  or must otherwise be restored or returned by any obligee of the Secured
Obligations,  whether as a "voidable  preference,"  "fraudulent  conveyance," or
otherwise,  all as though such payment or performance  had not been made. In the
event that any payment, or any part thereof, is rescinded,  reduced, restored or
returned, the Secured Obligations shall be reinstated and deemed reduced only by
such amount paid and not so rescinded, reduced, restored or returned.

                  17.  Miscellaneous.  (a) Lender may  execute any of its duties
hereunder by or through  agents or employees  and shall be entitled to advice of
counsel concerning all matters pertaining to its duties hereunder.

                  (b)  Neither  Lender  nor  any  of  its  officers,  directors,
employees,  agents or counsel shall be liable for any action  lawfully  taken or
omitted to be taken by it or them  hereunder or in connection  herewith,  except
for its or their own gross negligence or willful misconduct.

                  (c) This  Agreement  shall be binding upon  Pledgors and their
successors  and assigns,  and shall inure to the benefit of, and be  enforceable
by,  Lender  and its  successor  and  assigns,  and shall be  governed  by,  and
construed  and enforced in accordance  with,  the internal laws in effect in the
State of  California  without  giving effect to principles of conflicts of laws,
and none of the terms or  provisions of this  Agreement may be waived,  altered,
modified  or amended  except in writing  duly signed for and on behalf of Lender
and Pledgors.

                  18.   Severability.   If  for  any  reason  any  provision  or
provisions  hereof are  determined to be invalid and contrary to any existing or
future law,  such  invalidity  shall not impair the operation of or affect those
portions of this Agreement which are valid.

                  19. Notices.  Except as otherwise provided herein, whenever it
is  provided  herein  that  any  notice,  demand,  request,  consent,  approval,
declaration or other  communication  shall or may be given to or served upon any
of the parties by any other  party,  or whenever  any of the parties  desires to
give or serve upon any other a  communication  with  respect to this  Agreement,
each such notice,  demand,  request,  consent,  approval,  declaration  or other
communication  shall be in writing and either  shall be delivered in person with



                                       16







receipt  acknowledged  or sent by registered or certified  mail,  return receipt
requested,  postage prepaid, or by telecopy and confirmed by telecopy answerback
addressed as follows:

                  (a)      If to Lender, at

                           c/o Polaris Investment Management Corporation
                           201 Mission Street, 27th Floor
                           San Francisco, CA  94105
                           Attention:   President
                           Telecopy Number:  (415) 284-7460

                           With copies to

                           c/o Polaris Investment Management Corporation
                           201 Mission Street, 27th Floor
                           201 High Ridge Road, 1st Floor
                           Stamford, CT  06927-4900
                           Attention:  Portfolio Management
                           Telecopy Number:  (203) 357-4585

                  (b)      If to any Pledgor other than Rosemont Leasing, Inc.,
                           at

                           c/o Triton Aviation Services Limited
                           55 Green Street, Suite 500
                           San Francisco, CA  94111
                           Attention:  President
                           Telecopy Number:  (415) 398-9184


                  (c)      If to Rosemont Leasing, Inc., at

                           200 West Madison Street, 42nd Floor
                           Chicago, Illinois  60606
                           Attention:  Kenneth R. Posner



                                       17







or at such  other  address  as may be  substituted  by  notice  given as  herein
provided.  The giving of any notice required  hereunder may be waived in writing
by the party  entitled to receive such notice.  Every notice,  demand,  request,
consent, approval,  declaration or other communication hereunder shall be deemed
to have been duly  given or  served on the date on which  personally  delivered,
with receipt  acknowledged,  telecopied and confirmed by telecopy  answerback or
three (3) business  days after the same shall have been  deposited in the United
States  mail.  Failure  or delay in  delivering  copies of any  notice,  demand,
request,  consent,  approval,  declaration or other communication to the persons
designated  above  to  receive  copies  shall  in no way  adversely  affect  the
effectiveness of such notice, demand, request, consent, approval, declaration or
other communication.

                  20.   Confidentiality.   Lender   agrees  that  it  will  keep
confidential  all  information   regarding  Pledgors  that  it  may  receive  in
connection with the transactions  contemplated hereunder and agrees that it will
only use such  information  in connection  with such  transactions  and will not
disclose  any of such  information  other than (i) to its  directors,  officers,
employees, advisors, auditors, agents or representatives who are or are expected
to be involved in the  evaluation of such  information  in connection  with such
transactions and who are advised of the confidential  nature of such information
(and for whose  compliance  Lender  shall be  liable),  (ii) to the extent  such
information  presently  is  or  hereafter  becomes  available  to  Lender  on  a
non-confidential  basis from a source other than a Pledgor,  (iii) to the extent
such information has been independently  acquired or developed by Lender without
violating any of its obligations under the Purchase Agreement  or any  Ancillar
Agreement or (iv) to the extent  disclosure  is required by law,  regulation  or
judicial order.

                  21.  Section  Titles.  The Section  titles  contained  in this
Agreement  are and shall be without  substantive  meaning or content of any kind
whatsoever and are not a part of the agreement between the parties hereto.

                  22. Counterparts. This Agreement may be executed in any number
of  counterparts,  which shall,  collectively  and  separately,  constitute  one
agreement.

                  23. Limited Recourse. Notwithstanding anything to the contrary
contained  herein,  in the Ancillary  Agreements,  the Keep Well,  the Keep Well
Guaranty,  the Loan Guaranty or any other  document or  instrument  executed and
delivered in connection with the consummation of the  transactions  contemplated
hereby and  thereby  (the "Loan  Documents"),  none of Rosemont  Leasing,  Inc.,
Edward P.  Schneider,  Steven C.  Wight and John E. Flynn  shall  have  personal
liability  for  the  payment  or  performance  of the  Obligations  or  for  the
representations,  warranties or covenants  contained in the Loan Documents,  and



                                       18







Lender and each  transferee,  holder or  assignee of all or any part of the Loan
Documents agree not to seek any damages or personal money judgement  against any
of Rosemont Leasing, Inc., Edward P. Schneider, Steven C. Wight or John E. Flynn
for any default under any or all of the Loan  Documents,  but in any such event,
will look solely to the Pledged Collateral. Nothing herein or in any of the Loan
Documents  shall be construed to prevent Lender and each  transferee,  holder or
assignee of any such Loan  Document  from  exercising  and  enforcing  any other
remedy (not  involving  personal  liability)  allowed at law or equity or by any
statute. The foregoing  exculpation shall not limit or be construed to limit the
personal liability of any Rosemont Leasing, Inc., Edward P. Schneider, Steven C.
Wight or John E. Flynn to the extent  that after a default  shall have  occurred
under one or more of the Loan Documents, any thereof shall collect rents, issues
or profits of any of the property  secured by the Loan  Documents  and shall not
promptly  apply  the  same in the  manner  required  or  permitted  by the  Loan
Documents,  it being intended that Rosemont Leasing,  Inc., Edward P. Schneider,
Steven C. Wight and John E. Flynn shall be personally  liable to the full extent
of such misapplication after a default.



                                       19







                  IN WITNESS WHEREOF, the parties hereto have caused this Pledge
and Security Agreement to be duly executed as of the date first written above.


                                    TRITON AVIATION SERVICES V LLC
                                    By:  Triton Aviation Services Limited, its
                                         Manager

                                    By:  /S/ John E. Flynn
                                         ---------------------------------------
                                         Title: John E. Flynn, President


                                    TRITON AVIATION SERVICES LIMITED


                                    By:  /S/ John E. Flynn
                                         ---------------------------------------
                                         Title: John E. Flynn, President


                                    ROSEMONT LEASING INC.


                                    By:  /S/ H. Handelsman
                                         ---------------------------------------
                                         Title: VP - H. Handelsman

                                    /S/ Edward Schneider
                                    --------------------------------------------
                                    Edward Schneider

                                    /S/ Steven C. Wight
                                    --------------------------------------------
                                    Steven C. Wight

                                    /S/ John E. Flynn
                                    --------------------------------------------
                                    John E. Flynn



                                       20







Accepted and Acknowledged by:

POLARIS AIRCRAFT INCOME FUND V
By:  Polaris Investment Management
     Corporation, General Partner

By:  /S/ Marc A. Meiches
    --------------------------------------
    Title: Marc A. Meiches, Vice President



                                       21







                                   SCHEDULE I

                    Attached  to a d forming a part of that  certain  Pledge and
Security  Agreement dated as of April 1, 1997 among Triton  Aviation  Services V
LLC, a  California  limited  liability  company  ("Borrower"),  Triton  Aviation
Services Limited,  a Bermuda  corporation  ("TASL"),  Rosemont Leasing,  Inc., a
Delaware  corporation,  Edward  Schneider,  Steven C.  Wight  and John E.  Flynn
(collectively,  "Pledgors" and each of them individually a "Pledgor") to Polaris
Aircraft Income Fund V, a California limited partnership.

Name and
Address of
 Pledgor                                                               Interests
- ----------                                                             ---------

Triton Aviation Services Limited                                         48.5%
55 Green Street, Suite 500
San Francisco, California 94111

Rosemont Leasing, Inc.                                                   48.5%
200 West Madison Street, 42nd Floor
Chicago, Illinois  60606

Edward Schneider                                                            1%

c/o Triton Aviation Services Limited
    55 Green Street, Suite 500
    San Francisco, California 94111

Steven C. Wight                                                             1%

c/o Triton Aviation Services Limited
    55 Green Street, Suite 500
    San Francisco, California 94111

John E. Flynn                                                               1%

c/o Triton Aviation Services Limited
    55 Green Street, Suite 500
    San Francisco, California 94111







                                   SCHEDULE II
                      to the Pledge and Security Agreement

                                PLEDGE AMENDMENT

                    This  Pledge  Amendment,  dated  ______,  19__ is  delivered
pursuant to [Section 6(a)(iv)/Section 7(d)] of the Pledge and Security Agreement
referred to below. The undersigned  hereby agrees that this Pledge Amendment may
be attached to that certain  Pledge and Security  Agreement,  dated ________ __,
1997 among the undersigned and others,  as Pledgors,  to Polaris Aircraft Income
Fund V, a California limited  partnership,  that the Pledged Interests listed on
this  Pledge  Amendment  shall be and  become a part of the  Pledged  Collateral
referred to in said Pledge and Security  Agreement  and shall secure all Secured
Obligations  referred  to in said  Pledge and  Security  Agreement  and that the
undersigned  shall be deemed to be a Pledgor  under  said  Pledge  and  Security
Agreement.

                                           [Name of Pledgor]

                                           By:
                                               ---------------------------------
                                               Title:


Name and
Address of
 Pledgor                                                         Interests
- ----------                                                       ---------







                                    EXHIBIT A

                    Agreement,  dated  April  2,  1997,  by and  among  Rosemont
Leasing, Inc., Edward P. Schneider,  Steven C. Wight and John E. Flynn regarding
mutual options on the Pledged Interests.