STC ST10157SC-D

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number ST 10157 SC-D This certificate issued to: American Airlines, Inc.

3900 N. Mingo Road Engineering Dept., MD 208 Tulsa, Oklahoma 74116 Part 25 of the Federal Aviation Regulations:

Original Product -Typeertificate Number: AGWE Make: McDonnell Douglas Model: DC-9-82, -83 Description of Type Design Change:

Modify the wing fuel tanks access cover installation by replacing the existing rubstrip and seal with a new encapsulated wire mesh gasket and a new seal in accordance with Master Data List K3176, Rev Original dated November 10, 2005, or later DAS 700094-SW approved revision.

This approval should not be incorporated in any aircraft of this specific model until compatibility of this modification with previously approved modifications has been 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.

Limitations and Conditions: continued on page 3 of 3)

Date of Application: April 21, 2005 Date Reissued:

Date of Issuance: November 16, 2005 Date Amended:

FEDERAL KVIATION * AMINISTRATO C. E. Williams Signature) DAS 700094-SW Administrator (Title)

47.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number ST 10157 SC-D Certification Basis:

Based on 14CFR 21.115 and 21.101, and the FAA policy for non-significant changes in FAA Order 8110.48, the certification basis for the McDonnell Douglas Model DC-9-82, -83 series aircraft for the change is as follows:

a. The Type Certification basis for McDonnell Douglas Model DC-9-82, -83 series airplanes is shown on TCDS A6WE for parts not changed or not affected by the change.

b. The certification basis for parts changed or affected by the change since the reference date of application, April 21, 2005, is based upon Part 25, as amended by Amendment 25-117. Based on 14 CFR 21.115 and 21.101, and the FAA policy for non significant changes in FAA Order 8110.48, the certification basis for this modification was determined to be:

Regulations at the latest amendment 25-0 through 25-117

25.21.a.1, 25.29, 25.581.a, b, 25.601, 25.603, 25.609.a, 25.954.a, b, 25.965.a, 25.981.a.3, b,

25.1301, 25.1309.a, 25.1529 Regulations at an intermediate amendment none Regulations at the amendment level in TCDS A6WE none --END--

47.