STC SA1489CE

This certificate issued to: AVCON Industries, Inc 516 N. Oliver, Hangar J P.O. Box 748 Newton, KS 37114

Part 25 of the Federal Aviation Regulations. Effective February 1, 1965, plus amendments and special conditions as listed on the type certificate data sheet.

Original Product - Type Certificate Number: A10CE Make: Learjet, Inc Model: 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A, 36, 36A

Description of Type Design Change: Removal of 24-inch wide executive door and installation of 36-inch wide cargo door per AVCON Drawing List 36000 stamped “FAA Approved” with a date of May 8, 1979, July 3, 1980, November 15, 2010, or later approved revision for Learjet Models 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A, 36, and 36A.

1. Compatibility of this design change with previously approved modifications must be determined by the installer. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

2. Proof pressure test of each modified aircraft to 1.33 times normal operating pressure required.

3. Installation of this STC required limitation of the maximum operating altitude to 45,000 ft MSL for the Learjet Models 31 and 31A in accordance with FAA Approved Airplane Flight Manual Supplement dated July 13, 2001 or later FAA approved revision.

4. Amended July 13, 2001 to add Models 31 and 31A.

Date reissued: July 13, 2001; November 15, 2010

Date amended: July 3, 1980; July 13, 2001

Original signed by Grant E. Youngdahl

( Signature) Grant E. Youngdahl Program Manager Wichita Aircraft Certification Office (Title) Date of application: March 26, 1979 Date of issuance: May 8, 1979

FAA FORM 8110-2-1(10-69) PAGE 2 of 2 PAGES