STC SA3942WE-D

This Certificate issued to United Air Lines, Inc.

600 Jefferson Street Houston, Texas 77002

Part 25 of the Federal Aviation Regulations.

A20WE

Boeing

747-122 Description of Type Design Change: Rework of High-Frequency Communications System to install singlesideband capability in accordance with United Air Li nes, DAS-1-WE, Approved Drawing List No. 3942 dated March 27, 1980 or later FAA approved revisions.

Limitations and Conditions: The approval of this change in type design applies only to 747-122 aircraft.

This approval does not extend to other aircraft of this model on which ot her 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. This determ ination should include consideration of significant changes in weight distribution such as increase in the fixed disposable weight in the fuselage. If the holder agrees to permit another person to use this certif icate 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: March 26, 1980

Date of issuance: March 27, 1980

Date reissued: November 30, 2011

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

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