STC SA1157NW

This Certificate issued to United Air Lines, Inc.

600 Jefferson Street Houston, Texas 77002 Part 25 of the Federal Aviation Regulations.

A20WE

Boeing

747-100 Description of Type Design Change: Removal of the JT9D-3A engine fan case splitter (per United Air Lines COA 8-1464, ER #6) from the Boeing – 100A nacelles (blow-in-door inlets). FAA Approved Airplane Flight Manual Supplement for the Model 747-122 is required as part of this approval.

Limitations and Conditions: The approval of this change in type design applies basically to the above model aircraft only. This approval should not be ex tended to other specific airplanes of this model on which other previously approved modifications ar e incorporated unless it is determined 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 e 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. A copy of this Certificate No. SA1157NW shall be maintained as part of the permanent records for the modified aircraft.

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: January 9, 1981

Date of issuance: January 21, 1981

Date reissued: November 30, 2011

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

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