UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                           ---------------------------

                                    FORM 8-K

                           ---------------------------



                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


         Date of report (date of earliest event reported): May 28, 1997

                           ---------------------------

                          Commission File No. 33-15551

                           ---------------------------




                        POLARIS AIRCRAFT INCOME FUND IV,
                        A California Limited Partnership


                        State of Organization: California
                   IRS Employer Identification No. 94-3039169
         201 Mission Street, 27th Floor, San Francisco, California 94105
                           Telephone - (415) 284-7400













                       This document consists of 6 pages.









Item 2.

On May  28,  1997,  Polaris  Investment  Management  Corporation  (the  "General
Partner"  or  "PIMC"),  on  behalf  of  Polaris  Aircraft  Income  Fund  IV (the
"Partnership"), executed definitive documentation for the purchase of all of the
Partnership's  13 remaining  aircraft (the  "Aircraft") and certain of its notes
receivables by Triton  Aviation  Services IV LLC, a special purpose company (the
"Purchaser").  The final  closings  for the purchase of 9 of the 13 Aircraft had
occurred  as of June 6,  1997.  The  Purchaser  is  managed  by Triton  Aviation
Services,  Ltd. ("Triton  Aviation"),  a privately held aircraft leasing company
which was formed in 1996 by Triton  Investments,  Ltd., a company which has been
in the marine cargo container  leasing business for 17 years and is diversifying
its portfolio by leasing commercial aircraft.  Each Aircraft was sold subject to
the existing leases.

The General Partner's Decision To Approve The Transaction

In  determining  whether  the  transaction  was in  the  best  interests  of the
Partnership  and its  unitholders,  the General Partner  evaluated,  among other
things, the risks and significant expenses associated with continuing to own and
remarket  the  Aircraft  (many of which were subject to leases that were nearing
expiration).  The General Partner  determined that such a strategy could require
the  Partnership  to  expend a  significant  portion  of its cash  reserves  for
remarketing  and that  there was a  substantial  risk that this  strategy  could
result  in the  Partnership  having  to  reduce  or  even  suspend  future  cash
distributions  to limited  partners.  The  General  Partner  concluded  that the
opportunity  to sell the Aircraft at an attractive  price would be beneficial in
the present  market  where  demand for Stage II aircraft  is  relatively  strong
rather than attempting to sell the aircraft  "one-by-one"  over the coming years
when the demand for such Aircraft might be weaker.  During the months of intense
negotiations,  GE Capital  Aviation  Services,  Inc.  ("GECAS"),  which provides
aircraft  marketing and management  services to the General  Partner,  sought to
obtain the best price and terms  available for these Stage II aircraft given the
aircraft market and the conditions and types of planes owned by the Partnership.
Both the General  Partner and GECAS  approved the sale terms of the Aircraft (as
described  below)  as being  in the best  interest  of the  Partnership  and its
unitholders  because  both  believe  that this  transaction  will  optimize  the
potential cash  distributions to be paid to limited partners.  To ensure that no
better offer could be obtained, the terms of the transaction negotiated by GECAS
included a "market-out"  provision  that  permitted the  Partnership to elect to
accept an offer for all (but no less than all) of the assets to be sold by it to
the Purchaser on terms which it deemed more  favorable,  with the ability of the
Purchaser to match the offer or decline to match the offer and be entitled to be
compensated in an amount equal to 1 1/2% of the  Purchaser's  proposed  purchase
price.  The Partnership did not receive any other offers and,  accordingly,  the
General Partner believes that a valid market check has occurred  confirming that
the terms of this  transaction  were the most  beneficial  that  could have been
obtained.

The Terms of the Transaction

The total purchase price (the "Purchase  Price") to the Purchaser is $29,748,000
which is  allocable  to the  Aircraft  and to certain  notes  receivable  by the
Partnership.  The  Purchaser  is not  receiving  any of the  Partnership's  cash
reserves,  estimated to be approximately  $10,400,000 after the anticipated July
cash distribution is made to limited partners. The Purchaser paid into an escrow
account  $3,351,410 of the Purchase Price in cash at the closing and delivered a
promissory  note (the  "Promissory  Note") for the  balance of  $26,396,590.  As
described  below,  this transaction will enable the Partnership to distribute to
limited  partners the cash down payment received on the sale of the Aircraft and
permit the Partnership to distribute to limited  partners a substantial  portion
of cash  reserves  which  have been  held by the  Partnership.  The  Partnership
intends  to  make  this   distribution  as  part  of  its  July  1997  quarterly
distribution to limited partners.

The  Promissory  Note is to be repaid  beginning  June 30, 1997 in 28  quarterly
installments of principal and interest in the amount of $1,294,663 over a period



                                        2





of seven  years  bearing  interest  at a rate of 12% per  annum  with a  balloon
principal  payment  in the  amount  of  $4,812,392  due on March 31,  2004.  The
Purchaser has the right to voluntarily prepay the Promissory Note in whole or in
part at any time without penalty. In addition, the Promissory Note is subject to
mandatory partial prepayment in certain specified instances.

Under the terms of the transaction, the Purchaser's assets, which are limited to
the  Aircraft,  including any income or proceeds  therefrom,  and any funds made
available to Purchaser under the working capital line described below constitute
the sole  source of payments  under the  Promissory  Note.  Although no security
interest over the Aircraft or the leases is granted in favor of the Partnership,
the equity interests in the Purchaser have been pledged to the  Partnership.  In
connection  with  that  pledge,  the  Purchaser  is  prohibited  from  incurring
indebtedness other than (i) the Promissory Note; (ii) deferred taxes not yet due
and  payable;  (iii)  indebtedness  incurred  to hushkit  Aircraft  owned by the
Purchaser;  (iv) demand loans to another SPC (defined below) at a market rate of
interest;  and (v) debt to trade  creditors  incurred in the ordinary  course of
business. In addition,  the Purchaser undertakes to keep the Aircraft and leases
free of any lien, security interest or other encumbrance other than (i) inchoate
taxes and materialmen's liens and the like, (ii) in the event that the Purchaser
elects to install  hushkits on any  Aircraft,  secured debt to the extent of the
full cost of such hushkit and other  hushkits  acquired  with  proceeds from the
same loan facility;  (iii) liens lessees are customarily permitted to incur that
are  required  to be  removed.  The  Purchaser  has the right to sell any of the
Aircraft without the consent of the Partnership,  except that the  Partnership's
consent  would be  required  in the event  that the sale  price is less than the
portion of the outstanding  balance of the Promissory Note which is allocable to
the Aircraft in question and the  Purchaser  does not have  sufficient  funds to
make up the  difference.  In the event that any of the  Aircraft are sold by the
Purchaser,  the  Promissory  Note is subject to a  mandatory  prepayment  of the
portion of the Promissory Note which is allocable to the Aircraft sold.

Polaris  Aircraft  Income Fund II,  Polaris  Aircraft  Income Fund III,  Polaris
Aircraft  Income  Fund V and  Polaris  Aircraft  Income  Fund VI have  also sold
certain  aircraft  assets to separate  special  purpose  companies  under common
management with the Purchaser  (collectively,  together with the Purchaser,  the
"SPC's") on terms  similar to those set forth above,  with the  exception of the
Polaris Aircraft Income Fund VI aircraft, which were sold on an all cash basis.

Under the terms of the  transaction,  the Purchaser's  Manager has undertaken to
make  available a working  capital line to the Purchaser of up to  approximately
$2,598,000 to fund operating obligations of the Purchaser.  This working capital
line is guaranteed by Triton  Investments,  Ltd., the parent of the  Purchaser's
Manager and such  guarantor  provided  the  Partnership  with a copy of its most
recent  balance  sheet  showing  a  consolidated  net  worth  (net  of  minority
interests)  of at least  $150-million  at December 31, 1996.  Provided  that the
Purchaser is not in default in making  payments due under the Promissory Note to
the Partnership,  the Purchaser is permitted to dividend to its equity owners an
amount  not to  exceed  approximately  $70,000  per  month.  The  Purchaser  may
distribute  additional  dividends  to the  equity  owners  to the  extent of the
working  capital  advances  made by the  Purchaser's  Manager  provided that the
working capital line available to the Purchaser will be deemed  increased to the
extent of such dividends.

The   Purchaser   purchased   the  Aircraft   effective  as  of  April  1,  1997
notwithstanding  the actual closing dates.  The utilization of an effective date
facilitated the determination of rent and other allocations between the parties.
The Purchaser has the right to receive all income and proceeds,  including rents
and  receivables,  from the Aircraft  accruing from and after April 1, 1997, and
the Promissory Note commenced bearing interest as of April 1, 1997.



                                        3





Neither PIMC nor GECAS will receive a sales  commission in  connection  with the
transaction. In addition, PIMC will not be paid a management fee with respect to
the  collection  of the  Promissory  Note.  Neither PIMC nor GECAS or any of its
affiliates  holds any  interest in Triton  Aviation or any of Triton  Aviation's
affiliates.  John Flynn, the current President of Triton Aviation, was a Polaris
executive  until  May 1996 and has over 15 years  experience  in the  commercial
aviation  industry.  At the time  Mr.  Flynn  was  employed  at PIMC,  he had no
affiliation with Triton Aviation or its affiliates.


With  respect  to the 4  Aircraft  that  have  not yet been  transferred  to the
Purchaser  as of  June 6,  1997,  the  Partnership  has  agreed  to  obtain  the
Purchaser's  consent before undertaking any significant action, such as making a
material modification or waiving a default under a lease.

Anticipated July Cash Distribution

The Partnership  anticipates  making a cash distribution to the limited partners
of approximately  $8,664,376  ($17.33 per limited  partnership unit) by July 30,
1997. Such distribution would be comprised of (i) the cash down payment received
from the sale of the Aircraft, less estimated transaction expenses (representing
approximately  $6.00 per  limited  partnership  unit);  (ii) the  portion of the
Partnership's  cash reserves which the General  Partner  determined is available
for  distribution  (representing  approximately  $9.00 per  limited  partnership
unit);  and (iii) the Promissory Note payment due from the Purchaser on June 30,
1997  (representing  approximately  $2.33 per  limited  partnership  unit).  The
foregoing anticipated distribution is based on the assumptions that the closings
for all the Aircraft  being sold to the  Purchaser  occur prior to July 1, 1997,
the  Partnership  timely  receives all payments due from the  Purchaser  and the
Partnership incurs estimated  operating and administrative  expenses  (including
expenses in connection with the transaction) of  approximately  $177,000 for the
quarter ended June 30, 1997. The Partnership's  estimated cash  distributions to
limited partners  constitutes  forward looking  information based upon the above
assumptions that may, for any number of reasons, not occur.  Accordingly,  there
can be no assurance that the  Partnership  will make a cash  distribution in the
amount anticipated.

Estimated Cash Reserves

The Partnership  estimates its cash reserves will be  approximately  $10,400,000
($18.72 per limited  partnership  unit) after the cash  distribution  to limited
partners  anticipated  to be made in July  1997.  PIMC has  determined  that the
Partnership maintain these cash reserves as a prudent measure to insure that the
Partnership  has available  funds in the event the Purchaser  defaults under the
Promissory  Note  and  for  other   contingencies   including  expenses  of  the
Partnership.  The  Partnership's  cash  reserves  will be  monitored  and may be
revised  from  time to time as  further  information  becomes  available  in the
future.



                                        4





Item 7.     Financial Statements, Pro Forma Financial Information and Exhibits.

       a)   Financial Statements.        None

       b)   Pro Forma Information.       None

       c)   Exhibits.

            2.1      Purchase, Assignment and Assumption Agreement
            2.2      Escrow Agreement
            2.3      Pledge and Security Agreement
            2.4      Keep Well Agreement
            2.5      Promissory Note
            2.6      Guaranty (Keep Well)
            2.7      Guaranty (SPV Indebtedness)


                                        5







                                    SIGNATURE



Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                POLARIS AIRCRAFT INCOME FUND IV
                                (Registrant)
                                By:     Polaris Investment
                                        Management Corporation,
                                        General Partner




        June 6, 1997                    By:     /S/Marc A. Meiches
- -----------------------------                   ------------------
                                                Marc A. Meiches
                                                Chief Financial Officer
                                                (principal financial officer and
                                                principal accounting officer of
                                                Polaris Investment Management
                                                Corporation, General Partner of
                                                the Registrant)


                                        6