STC SA4-577

United States Of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate This certificate has been reissued to replace the original certificate reported as lost.

This Certificate issued to United Air Lines, Inc.

600 Jefferson Street Houston, Texas 77002 Part 4a & 4b of the Civil Air Regulations CAR4a dated November 1, 1943 and CAR 4b dated November 9, 1945N bOriginal Product Type Certificate Number :

Boeing

DC-6 Description of Type Design Change: Modification of Aileron Trim Control Gearing per United Air Lines Drawing 1F-8342, Change “C”; 3F- 6934, Change “C”; 6F-6932, Change “A”; 9F- 3731, Change “F”.

Limitations and Conditions: This approval should not be extended to other specific aircraft of this model on which other previously appr oved modifications are 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 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.

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: November 11, 1957

Date of issuance: August 16, 1958

Date reissued: November 30, 2011

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

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