STC SA2718NM-D

This Certificate issued to United Air Lines, Inc.

600 Jefferson Street Houston, Texas 77002

Part 25 of the Federal Aviation RlOriginal Product Type Certificate Number :

A16WE

Boeing

737-222 Description of Type Design Change: Replacement of the No. 1 transponder system with a Mode S/ATCRBS transponder system certified for ATCRBS Mode C use, in accordance with United Air Lines, DAS-1-WE, Approved Drawing List No. 2718 dated January 23, 1987, or later FAA approved revisions.

Limitations and Conditions: This approval does not extend to othe r aircraft of this model on which other previously approved modifications are incorporat ed unless it is determined by the installer that the interrelationship between this cha nge and any of those other previ ously approved modifications will introduce no adverse effect upon the airworthiness of th at aircraft. Approved Flight Manual Supplement dated January 24, 1987, applies to this modification. If the holder agrees to permit another person to use this certificate to alter the product, the holder sh all give the other person written evidence of that permission.

This certificate and the supporting data, which is the basis for approval, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration.

Date of application: December 4, 1986

Date of issuance: January 24, 1987

Date reissued: November 30, 2011

( Signature) Haifa Haj-Eid Supervisor, Technical & Administrative Support Staff, Los Angeles Aircraft Certification Office (Title)

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