STC SA2785NM-D

This Certificate issued to United Air Lines, Inc.

600 Jefferson Street Houston, Texas 77002 Part 25 of the Federal Aviation Regulations. * Reference Type Certificate Data Sheet A16WE for Special Conditions.

Original Product Type Certificate Number : A16WE Make: Boeing Model: 737-291/2A1 Series Description of Type Design Change : Installation of dual Mode-S/ATCRB S transponders and Traffic Alert Collision Avoidance System (TCAS) in accordance with United Air Lines DAS-1-WE Approved Master Drawing List No. 2785 dated February 8, 1991 or later FAA ap proved revision. United Air Lines AFM Supplement to FAA Approved Flight Manual D6-8737.291A and D6-8737.4A1A dated February 8, 1991 or later FAA approved revisions is required as part of this installation.

Limitations and Conditions : This approval does not extend to other ai rcraft of this model on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those other previously a pproved modifications will introduce no adverse effect upon the airworthiness of that aircraft. 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. Refer to AFM Supplement.

Date of application : January 7, 1991

Date of issuance : February 8, 1991

Date reissued : November 30, 2011

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

Transfer the ownership of Supplemental Type Certificate Number

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from (Name of grantor) (Print or type)

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Signature of grantor (In ink):

U.S. GPO 1987-763-28