STC SA2-639

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA2-639 This certificate issued to: Signature Flight Support Corporation, a Delaware Corporation 7511 Lemmon Avenue, Hangar C Dallas, TX 75209 Part of the Foegulations.

Aero Bulletin 7A of the Bureau of Air Commerce Original Product Type Certificato Number : 669 Make: McDonnell Douglas Model: DC-3 Description of Type Design Change:

Installation of Surface Combustion Heater, P/N A97A28, and related equipment in accordance with data listed on Dallas Aero Service Drawing List titled "Combustion Heater Installation - DC3" Rev. 1 dated 9/25/58, or later FAA approved revision.

Not eligible on aircraft certificated under SR-407 unless AFM Supplement is submitted and approved by Aircraft Certification Division.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

Date of Application: September 10, 1958 Date Reissued: 7/10/92; 12/21/98; 8/31/00 Date of Issuance: November 30, 1959 Date Amended: April 19, 1982 Rev. 5 By Direction of the Administrator (Signature) S. Frances Cox TOMINISTRATIO Manager, Special Certification Office, Southwest Region (Title)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code ) from (Name of grantor) (Print or type).

(Address of grantor) (Number and street) (City, State, and RIP code ) Extent of Authority (if licensing agreement); - Date of Transfer:

Signature of grantor (In ink):

FAA AC 69-5536