1 Exhibit 4.6 SUPPLEMENT NO. 3 MODIFICATION AND AMENDMENT DATED AS OF MARCH 14, 1997 AMENDING TRUST INDENTURE DATED AS OF DECEMBER 17, 1993 AND SUPPLEMENTED SEPTEMBER 12, 1996 BY AND AMONG SIMULA, INC. AS ISSUER, THE SUBSIDIARY GUARANTORS AS GUARANTORS AND BANK ONE TRUST COMPANY, NA AS TRUSTEE 12% SENIOR SUBORDINATED NOTES DUE 1998 SERIES C 10% SENIOR SUBORDINATED NOTES 2 NOTE MODIFICATION SUPPLEMENT DATED MARCH 14, 1997 This Indenture Note Modification and Amendment ("Supplement") is dated as of March 14, 1997, among Simula, Inc., an Arizona corporation (hereinafter the "Company"), having its principal office at 2700 North Central Avenue, Suite 1000, Phoenix, Arizona 85004, and each of its subsidiaries appearing hereafter (hereinafter the "Subsidiary Guarantors"), having the same principal office as the Company, and Bank One Trust Company NA, having its principal office at 100 East Broad Street, Columbus, Ohio 43271. RECITALS The Company has duly authorized the creation of an issue of one or more series of its Notes of the tenor and amount set forth in its indenture dated December 17, 1993, (the "Indenture"). The capitalized terms herein have the same meaning as provided in the Indenture. Pursuant to the Indenture, the Company authorized and issued its 12% Senior Subordinated Notes and Series C 10% Senior Subordinated Notes (collectively the "Notes"). This Supplement sets forth a modification to the covenants of the Company respecting incurrence of additional Indebtedness and the making of Restricted Payments. The Indenture, pursuant to Article 9 thereof, provides for the execution and delivery, upon the consent of holders of not less than a majority in principal amount of Notes, of one or more supplemental indentures in connection with adding, changing or modifying the provisions of the Indenture. In accordance therewith, the Company, Subsidiary Guarantors and Trustee hereby enter into this Supplement No. 3 dated March 14, 1997. NOW THEREFORE, for and in consideration of the foregoing, it is mutually covenanted and agreed, for the benefit of the holders of the Notes, as follows: 3 ARTICLE 10 COVENANTS SECTION 10.9 The covenant regarding Incurrence of Additional Indebtedness in Section 10.9 is amended to read as follows: SECTION 10.9 Limitation on Incurrence of Additional Indebtedness. - Entire Section Deleted. SECTION 10.10 The covenant regarding limitation of Restricted Payments in section 10.10 is amended to read as follows: SECTION 10.10 Limitation on Restricted Payments. - Entire Section Deleted. MISCELLANEOUS No Other Changes. No other changes to the Indenture are hereby made. Governing Law. This Supplement No. 3 shall be deemed to be a contract made under the internal laws of the State of Arizona and for all purposes shall be construed in accordance with the internal laws of said State. Counterparts. This Supplement may be executed in any number of counterparts and each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. IN WITNESS WHEREOF, Simula, Inc. and each of its Subsidiaries have caused this Supplement to be signed in their respective corporate names by their respective authorized officers and Bank One Trust Company, NA, Trustee, has caused this Supplemental Indenture to be executed in its corporate name by one of its authorized officers, all as of the date and year first above written. SIMULA, INC., an Arizona corporation By____________________________________________ Sean K. Nolen Vice President and Chief Financial Officer BANK ONE TRUST COMPANY, NA, as Trustee By____________________________________________ Trust Officer -2- 4 SUBSIDIARY GUARANTORS: SIMULA GOVERNMENT PRODUCTS, INC., an Arizona corporation By__________________________________________ Sean K. Nolen, Assistant Treasurer INTAERO, INC., an Arizona corporation By__________________________________________ Sean K. Nolen, Assistant Treasurer AIRLINE INTERIORS, INC., an Arizona corporation By__________________________________________ Sean K. Nolen, Assistant Treasurer COACH AND CAR EQUIPMENT CORPORATION, an Arizona corporation By__________________________________________ Sean K. Nolen, Assistant Treasurer ARTCRAFT INDUSTRIES CORP., an Arizona corporation By__________________________________________ Sean K. Nolen, Assistant Treasurer -3- 5 SIMULA AUTOMOTIVE SAFETY DEVICES, INC. an Arizona corporation By_____________________________________________ Sean K. Nolen, Assistant Treasurer SAFETY EQUIPMENT, INC., an Arizona corporation By_____________________________________________ Sean K. Nolen, Assistant Treasurer SEDONA SCIENTIFIC, INC., an Arizona corporation By_____________________________________________ Sean K. Nolen, Assistant Treasurer INTERNATIONAL CENTER FOR SAFETY EDUCATION, INC., an Arizona corporation By_____________________________________________ Sean K. Nolen, Assistant Treasurer VIATECH, INC., a Delaware corporation By_____________________________________________ Sean K. Nolen, Assistant Treasurer -4- 6 STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1997, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen, to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Vice President and Chief Financial Officer of SIMULA, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this ____________ day of _______________________________, 1996. ____________________________________________ Notary Public (Seal) STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared ___________________________ to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say: That he/she is a Trust Officer of BANK ONE TRUST COMPANY, NA, one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he/she acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this ____________ day of _______________________________, 1996. ____________________________________________ Notary Public (Seal) -5- 7 STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of SIMULA GOVERNMENT PRODUCTS, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of INTAERO, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) -6- 8 STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of AIRLINE INTERIORS, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of COACH AND CAR EQUIPMENT CORPORATION, one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) -7- 9 STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of ARTCRAFT INDUSTRIES CORP., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of SIMULA AUTOMOTIVE SAFETY DEVICES, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) -8- 10 STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of SAFETY EQUIPMENT, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of SEDONA SCIENTIFIC, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) -9- 11 STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of INTERNATIONAL CENTER FOR SAFETY EDUCATION, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) STATE OF ) ) ss. County of ) On this _____ day of ______________________, 1996, before me, a Notary Public in and for said county and state, personally appeared Sean K. Nolen to me personally known and known to me to be the same person who executed the within and foregoing instrument, who, being by me duly sworn, did depose, acknowledge and say that he is the Assistant Treasurer of VIATECH, INC., one of the corporations described in and which executed the foregoing instrument; that said instrument was executed on behalf of said corporation by authority of its Board of Directors; and he acknowledged the execution of said instrument to be the voluntary act and deed of said corporation by it voluntarily executed. IN WITNESS WHEREOF, I have hereunto set my hand and official seal this _____________ day of ____________________________ 1996. ____________________________________________ Notary Public (Seal) -10-