STC SA1553NM

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate NumberSA1553NM This certificate issued to: Avcon Industries, Inc.

714 N. Oliver Road, Hanger M Newton City County Airport Newton, KS 67114 Part 25 of the Federal. Aviution Requlations Original Product Type Certificate Number: A10CE, ASCE Make: Learjet Inc.

Model: 55, 55B and 55C Installation of one or two 90 U. S gallons fuselage auxiliary fuel tank(s), in accordance with Branson List of Drawings Description of Type Design Change:

and Documents, No. 61A000, Revision B, FAA approved May 16, 1983, or later FAA approved revision.

The installer must determine whether this design change is compatible with previously approved modifications. If the Limitations and Conditions:

holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

Lute of upplicution: August 17, 1982 Date Reissued: 12/24/97; 7/21/05; 06/03/10 Date of Issuance: May 16, 1983 Bute umended: 12/20/88; 3/30/90 FEDERAL AVIATION By Direction of the Administrator Moria Ment (Signature) M. Monica Merritt, Manager TOMINS TRATO Airplane Certification Office, Southwest Region (Title)

FAR Form 8110-2(10-68) Page 1 of 3

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SAI553NM Date of Issuance: March 07, 1978 Reissuance Date: June 03, 2010 Limitations and Conditions: (Continued):

1. The two (2) tank installation is approved for the Learjet Model 55C only.

2. FAA approved Flight Manual Supplement, dated May 16, 1983, or later FAA approved revision is required for the single tank installation.

4. FAA approved Maintenance Manual Supplement, dated May 16, 1983, or later FAA approved revision is FAA approved Flight Manual Supplement for the Learjet Model 55C, VAC DOC FMS-602, dated March 30, 1990, or later FAA approved revision is required for the two (2) tank installation.

6. The installer must determine whether this design change is compatible with previously approved modifications. 5. This approval should not be extended to other aircraft of these models on which other previously approved If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission modifications are incorporated unless it is determined that the interrelationship between this chang and any other previously approved modification will introduce no adverse effect upon the airworthiness of the aircraft.

FAA Form 8110-2-1(10-691 Page 3 of 3