EXHIBIT 4.11 ================================================================================ TRANSDIGM INC., THE GUARANTORS named herein and STATE STREET BANK AND TRUST COMPANY, as Trustee --------------- SUPPLEMENTAL INDENTURE Dated as of June 26, 2001 To Indenture Dated as of December 3, 1998 By and Among TRANSDIGM INC., the Guarantors named therein and the Trustee --------------- Pursuant to which were issued $200,000,000 of 10-3/8% Senior Subordinated Notes due 2008 of TransDigm Inc. --------------- ================================================================================ SUPPLEMENTAL INDENTURE SUPPLEMENTAL INDENTURE (this "SUPPLEMENTAL INDENTURE"), dated as of June 26, 2001 among Champion Aerospace Inc., a Delaware corporation, Christie Electric Corp., a California corporation (collectively, the "GUARANTEEING SUBSIDIARIES" and, each, a "GUARANTEEING SUBSIDIARY"), each a subsidiary of TransDigm Inc., a Delaware corporation (the "COMPANY"), the Company, TransDigm Holding Company, a Delaware corporation ("HOLDINGS"), Adams Rite Aerospace, Inc., a California corporation ("ADAMS RITE"), ZMP, Inc., a California corporation ("ZMP"), and Marathon Power Technologies Company, a Delaware corporation ("MARATHON" and, together with Adams Rite, ZMP, Holdings and the Guaranteeing Subsidiaries, the "GUARANTORS") and State Street Bank and Trust Company, as trustee under the indenture referred to below (the "TRUSTEE"). W I T N E S S E T H WHEREAS, the Company, Holdings and Marathon have heretofore executed and delivered to the Trustee an indenture (the "Indenture"), dated as of December 3, 1998 providing for the issuance of an aggregate principal amount of up to $200.0 million of 10 3/8% Senior Subordinated Notes due 2008 (the "NOTES") and the guarantees thereof by Holdings and Marathon; WHEREAS, the Indenture provides that under certain circumstances newly acquired Subsidiaries of the Company shall execute and deliver to the Trustee a supplemental indenture pursuant to which such Subsidiaries shall unconditionally guarantee all of the Company's Obligations under the Notes and the Indenture on the terms and conditions set forth therein (the "GUARANTEE"); WHEREAS, the Company, Holdings, Marathon, Adams Rite and ZMP have heretofore executed and delivered to the Trustee a supplemental indenture, dated as of April 23, 1999 providing for Adams Rite and ZMP to become Guarantors under the Indenture; and WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture. NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, each Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. 2. AGREEMENT TO GUARANTEE. Each Guaranteeing Subsidiary hereby agrees as follows: (a) Along with all Guarantors named in the Indenture, to jointly and severally Guarantee to each Holder of a Note authenticated and delivered by the Trustee and to the Trustee and its successors and assigns, irrespective of the validity and enforceability of the Indenture, the Notes or the obligations of the Company hereunder or thereunder, that: (i) the principal of and interest on the Notes will be promptly paid in full when due, whether at maturity, by acceleration, redemption or otherwise, and interest on the overdue principal of and interest on the Notes, if any, if lawful, and all other obligations of the Company to the Holders or the Trustee hereunder or thereunder will be promptly paid in full or performed, all in accordance with the terms hereof and thereof; and (ii) in case of any extension of time of payment or renewal of any Notes or any of such other obligations, that same will be promptly paid in full when due or performed in accordance with the terms of the extension or renewal, whether at stated maturity, by acceleration or otherwise. Failing payment when due of any amount so guaranteed or any performance so guaranteed for whatever reason, the Guarantors shall be jointly and severally obligated to pay the same immediately. (b) The obligations hereunder shall be unconditional, irrespective of the validity, regularity or enforceability of the Notes or the Indenture, the absence of any action to enforce the same, any waiver or consent by any Holder of the Notes with respect to any provisions hereof or thereof, the recovery of any judgment against the Company, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of a Guarantor. (c) The following is hereby waived: diligence, presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Company, any right to require a proceeding first against the Company, protest, notice and all demands whatsoever. (d) This Guarantee shall not be discharged except by complete performance of the obligations contained in the Notes and the Indenture or pursuant to Section 6 hereof. (e) If any Holder or the Trustee is required by any court or otherwise to return to the Company, the Guarantors, or any custodian, Trustee, liquidator or other similar official acting in relation to either the Company or the Guarantors, any amount paid by either to the Trustee or such Holder, this Guarantee, to the extent theretofore discharged, shall be reinstated in full force and effect. (f) Each Guaranteeing Subsidiary shall not be entitled to any right of subrogation in relation to the Holders in respect of any obligations guaranteed hereby until payment in full of all obligations guaranteed hereby. 2 (g) As between the Guarantors, on the one hand, and the Holders and the Trustee, on the other hand, (x) the maturity of the obligations guaranteed hereby may be accelerated as provided in Article 6 of the Indenture for the purposes of this Guarantee, notwithstanding any stay, injunction or other prohibition preventing such acceleration in respect of the obligations guaranteed hereby, and (y) in the event of any declaration of acceleration of such obligations as provided in Article 6 of the Indenture, such obligations (whether or not due and payable) shall forthwith become due and payable by the Guarantors for the purpose of this Guarantee. (h) The Guarantors shall have the right to seek contribution from any non-paying Guarantor so long as the exercise of such right does not impair the rights of the Holders under the Guarantee. (i) Pursuant to Section 11.03 of the Indenture, after giving effect to any maximum amount and any other contingent and fixed liabilities that are relevant under any applicable Bankruptcy or fraudulent conveyance laws, and after giving effect to any collections from, rights to receive contribution from or payments made by or on behalf of any other Guarantor in respect of the obligations of such other Guarantor under Article 11 of the Indenture, the obligations of each Guaranteeing Subsidiary shall be limited to the maximum amount as will result in the obligations of such Guarantor under its Guarantee not constituting a fraudulent transfer or conveyance. 3. SUBORDINATION. The obligations of each Guaranteeing Subsidiary under its guarantee pursuant to this Supplemental Indenture shall be junior and subordinated to the Senior Debt of each such Guaranteeing Subsidiary on the same basis as the Notes are junior and subordinated to the Senior Debt of the Company. For the purposes of the foregoing sentence, the Trustee and the Holders shall have the right to receive and/or retain payments by each Guaranteeing Subsidiary only at such time as they may receive and/or retain payments in respect of the notes pursuant to the indenture, including Article 10 thereof. 4. EXECUTION AND DELIVERY. Each Guaranteeing Subsidiary agrees that the Guarantees shall remain in full force and effect notwithstanding any failure to endorse on each note a notation of such Guarantee. 5. GUARANTEEING SUBSIDIARY MAY CONSOLIDATE, ETC. ON CERTAIN TERMS. Each Guaranteeing Subsidiary will be subject to Section 11.05 of the Indenture. 6. RELEASES. (a) In the event of a sale or other disposition of all of the assets of any Guarantor, by way of merger, consolidation or otherwise, or a sale or other disposition of all to the capital stock of any Guarantor, then such Guarantor (in the event of a sale or other disposition, by way of merger, consolidation or otherwise, of all of the capital stock of such Guarantor) or the corporation 3 acquiring the property (in the event of a sale or other disposition of all or substantially all of the assets of such Guarantor) will be released and relieved of any obligations under its Guarantee; PROVIDED that the net proceeds of such sale or other disposition are applied in accordance with the applicable provisions of the Indenture, including without limitation Section 4.10 of the Indenture. Upon delivery by the Company to the Trustee of an Officers' Certificate and an Opinion of Counsel to the effect that such sale or other disposition was made by the Company in accordance with the provisions of the indenture, including without limitation Section 4.10 of the Indenture, the Trustee shall execute any documents reasonably required in order to evidence the release of any Guarantor from its obligations under its Guarantee. (b) Any Guarantor not released from its obligations under its Guarantee shall remain liable for the full amount of principal of and interest on the and for the other obligations of any guarantor under the indenture as provided in Article 10 of the indenture. 7. NO RECOURSE AGAINST OTHERS. No past, present or future director, officer, employee, incorporator, stockholder or agent of either Guaranteeing Subsidiary, as such, shall have any liability for any obligations of the Company or any Guaranteeing Subsidiary under the Notes, any Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of the Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. Such waiver may not be effective to waive liabilities under the federal securities laws and it is the view of the Commission that such a waiver is against public policy. 8. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY. 9. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. 10. EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof. 11. THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Company. 4 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written. TRANSDIGM, INC. Dated: June 26, 2001 By: /s/ GREGORY RUFUS ------------------------------------- Name: Gregory Rufus Title: Vice President, Chief Financial Officer and Assistant Secretary TRANSDIGM HOLDING COMPANY By: /s/ GREGORY RUFUS ---------------------------------------- Name: Gregory Rufus Title: Vice President, Chief Financial Officer and Assistant Secretary MARATHON POWER TECHNOLOGIES COMPANY By: /s/ GREGORY RUFUS ---------------------------------------- Name: Gregory Rufus Title: Chief Financial Officer and Assistant Secretary ADAMS RITE AEROSPACE, INC. By: /s/ GREGORY RUFUS ---------------------------------------- Name: Gregory Rufus Title: Treasurer, Chief Financial Officer and Assistant Secretary ZMP, INC. By: /s/ GREGORY RUFUS --------------------------------------- Name: Gregory Rufus Address Title: Treasurer, Chief Financial Officer and Assistant Secretary CHAMPION AEROSPACE INC. By: /s/ GREGORY RUFUS --------------------------------------- Name: Gregory Rufus Title: Vice President and Secretary CHRISTIE ELECTRIC CORP. By: /s/ GREGORY RUFUS --------------------------------------- Name: Gregory Rufus Title: STATE STREET BANK AND TRUST COMPANY, as Trustee By: /s/ MICHAEL M. HOPKINS --------------------------------------- Name: Michael M. Hopkins Title: Vice President