STC SA5260NM

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA5260NM This certificate issued to: Stevens Aviation, Inc.

Part 23 of the Federal Aviation Regulations.

Original Product Type Certificate Number: A31CE Make: Beech Model: F90 Description of Type Design Change:

Installation of a Bendix/King Model EFS-50 two tube Electronic Flight Instrument System in accordance with Turbo West Installation Master Drawing No. TW-A-491-000, Revision A, dated August 25, 1992, FAA approved September 4, 1992, or later FAA approved revision.

1. FAA approved Flight Manual Supplement No. TW-167, dated September 4, 1992, or later FAA approved revision is required.

2. The equipment and wiring installed by this STC are in compliance with FAA High Intensity Radiated Field (HIRF) protection requirements for systems which perform critical functions. To maintain the HIRF integrity, repairs and/or future interfaces to the wiring installation must be in accordance with the continued airworthiness procedures as outlined in Turbo West Report No. TW-A-491-023, dated July 17, 1992, or later approved revision.

3. Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any other previously approved modifications will introduce no adverse effect upon the airworthiness of the aircraft. A copy of this Certificate and Flight Manual Supplement dated September 4, 1992 must be maintained as part of the permanent records for the modified aircraft.

Date of Application: July 6, 1992 Date Reissued: February 28, 1995 Date of Issuance: September 4, 1992 Date Amended:

FEDERAL AVIATION By Direction of the Administrator ROMAN T. GABRYS (Signature) Acting Manager HOMINIS TRA TON Denver Aircraft Certification Office Northwest Mountain Region, Denver, Colorado (Title)