STC SA2833WE-D

600 Jefferson Street Houston, Texas 77002

Part 4b of the Civil Air Regulations

4A28, Rev. A

Boeing

720-022 Description of Type Design Change: Installs two HF communications systems per United Air Lines drawing COA 4-1723. The system design is as much like Boeing installation on W. A. L. airplanes as possible but using Aeronautical Engineers Inc. design dual wire antenna systems per drawings AE2257 and AE2264 and South Eastern Region STC No. ST564SO.

Limitations and Conditions: This approval should not be extended to other specific airplanes of this model on which other previously approved modifications are incorporated, unless it is determined that the interrelationship between this cha nge and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that airplane. 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: March 12, 1975

Date of issuance: March 27, 1975

Date reissued: November 30, 2011

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

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