STC SA2739NM-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 :

A20WE

Boeing

747 SP Series Description of Type Design Change: Modifies the plumbing of the aircraft forward cargo compartment smoke detection system. The installation is in accordance with DAS-1-WE Approved United Air Lines Drawing List No. 2739 dated March 21, 1991, or later FAA approved revisions.

Limitations and Conditions: The approval of this installation applies basically to the 747 SP series only. This approval should not be extended to other aircraft 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 a ny of those previously approved modifications will introduce no adverse effect upon the airworthiness of this 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.

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: February 25, 1991

Date of issuance: March 21, 1991

Date reissued: November 30, 2011

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

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