STC ST165CH

United States Of America Department of Transportation - Federal Aviation Administration Certificate issued to replace certificate reported lost Supplemental Type Certificate

This Certificate issued to USA JET AIRLINES, INC.

HANGAR 2064 D Street Willow Run Airport Belleville, Michigan 48111 Part 4b* of the Civil Air Regulations. *Certification basis is set forth in Type Certificate Data Sheet TCDS No. A6WE Original Product Type Certificate Number :

A6WE McDonnell Douglas DC-9-31, -32, -32F, -33F, -34, -34F, DC-9-41, DC-9-51 Description of Type Design Change : Fabrication and installation of Stage 3 Hushkits on the above models when powered by Pratt & Whitney JT8D -7, -9, -11, -15, or -17 series engines in accordance with ABS Partnership Master Dr awing List No. MDL- 009-002-91, Rev. G, dated December 13, 1993, or later FAA approved revisions.

Limitations and Conditions: The installation should not be incor porated in any aircraft unless it is determined that the interrelationship between this installation and any previously approved configuration will not introduce any adverse effect upon the airworthiness of the aircraft. The approval of this modification applies to the above noted airplane model series only. A copy of this STC must be included in the permanent records of the modified aircraft.

If the holder agrees to permit another person to us e this certificate to alter the product, the holder shall give the other person written evidence of that permission. (See Page 3 for continuation)

Date of application : January 18, 1991

Date of issuance : January 26,1994

Date reissued : Mar. 27, 2002; Dec. 24, 2003 August 1, 2008

Date amended : April 29, 1997; April 30, 1999

( Signature) Manager, Propulsion Branch Los Angeles Aircraft Certification Office ( Title)

NOTE:

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Number ST165CH

Limitations and Conditions: (Cont.)

1. Compatibility of this design change with pr eviously approved modifications must be determined by the installer.

2. Aircraft Model and eligibly combinations are as follows:

Aircraft Model Pratt & Whitney Engine Models

DC-9-31, -32, -32F, -33F, -34, -34F JT8D-7, -7A, -9, -9A, -11, -15, -15A, -17, -17A DC-9-41 JT8D-9, -11, -15 DC-9-51 JT8D-15, -15A, -17, -17A

3. FAA approved Airplane Flight Manual S upplement FMS-K51000-093 for McDonnell Douglas DC-9-31, -32, -32F, -33F, -34, -34F series w ith Pratt & Whitney JT8D-7, -9, -11, -15, -17 series engines with ABS Partnership Stage 3 Hushkit installed, dated January 26, 1994, or later FAA approved revision is required with this modification.

FAA approved Airplane Flight Manual S upplement FMS-K51001-093 for McDonnell Douglas DC-9-41 series with Pratt & Whitney JT8D-9, -11, -15, series engines with ABS Partnership Stage 3 Hushkit installed, dated January 26, 1994, or late r FAA approved revision is required with this modification.

FAA approved Airplane Flight Manual S upplement FMS-K51002-093 for McDonnell Douglas DC-9-51 series with Pratt & Whitney JT8D-15, -17 series engines with ABS Partnership Stage 3 Hushkit installed, Revision A, Dated June 18, 1997, or later FAA approved revision is required with this modification.

4. The instruction for continued airworthiness of the basic aircraft and engines are still applicable.

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