STC SA2-1554

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA2-1554 This certificate issued to: Signature Flight Support Corporation, a Delaware Corporation 7511 Lemmon Avenue, Hangar C Dallas, TX 75209 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meet's the airworthiness requirement's of Part SRADT of the CiVi1 Air Regulations Original Product Type Certificate Number: 723 Make: Lockheed Model: 18 Description of Type Design Change:

Increase gross weight to 22,050 pounds take-off, and 20,500 pounds landing in accordance with Howard Aero, Inc. Engineering Report 275 Revision H dated 10/26/64, or later FAA approved revision.

Prior to release to service of a Howard 250 under this STC, each aircraft must have an airplane flight manual submitted and approved by the Aircraft Certification Division, Federal Aviation Administration.

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

Date of Application: May 11, 1962 Date Reissued: 9/4/92; 12/21/98; 8/31/00 Date of Issuance: May 20, 1963 Date Amended: May 20, 1982 Rev. 7 FEDERAL AVIATION By Direction of the Administrator Fan BRoach (Signature) o's. Frances Cox TOMINSTRATOR Manager, Special Certification Office, Southwest Region (Title)

FAA Form 8110-2(10-€8) Page 1 of 2

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 ZIP code) Extent of Authority (if licensing agreement): - Date of Transfer:

Signature of grantor (In ink):

FAA AC 69-5536