The STC search system is a complimentary service provided to the aviation community. We hope you find it useful. Our primary product is a comprehensive library of aviation regulations and standards, including tools for generating Airworthiness Directive compliance reports.

No. of STCs: 25

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA135CE	Status: Historical	App Date: 02/26/1963	Rev Date: 05/12/2011
Description: Installation of Lycoming O-320-A1A, A1B, A3A, A3B or Lycoming O-320-B1A, B1B, B3A, B3B engine, Hartzell HC-82X or HC-A2X series propellers with 7636D-4 blades and Woodward Model 210080 Governor. Data required: Doyn drawing 2000 dated February 21, 1063 and Doyn installation instructions dated February 21, 1963.
TC Nos.: A-799
Models: Cessna Aircraft Company170, 170A, 170B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA135CE	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Lycoming O-320-A1A, -A1B, -A3A, -A3B, or O-320-B1A, -B1B, -B3A, or B3B engine, Hartzell HC-82X or-A2X Series propellers with 7636D-4 blades and Woodward 210080 governor.
TC Nos.: A-799
Models: The Cessna Aircraft Company170, 170A, 170B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA164CE	Status: Historical	App Date:	Rev Date: 03/09/1978
Description: Installation of Hartzell HC-A3XK-2B/7636D-4 propellers and C-2513-2P spinners.
TC Nos.: 1A10
Models: The New Piper Aircraft Inc.PA-23-250
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA164CE	Status: Historical	App Date: 08/07/1963	Rev Date: 05/12/2011
Description: Installation of Hartzell HC-A3XK-2B/7636D-4 Propellers and C-2513-2P spinners. Data required: Doyn Dwg. 2100 dated August 5, 1963.
TC Nos.: 1A10
Models: Piper Aircraft Inc.PA-23-250 (Navy UO-1)
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA179CE	Status: Historical	App Date: 08/07/1963	Rev Date: 05/12/2011
Description: Installation of the following: Engines: Lycoming IO-540-A1A5 or Lycoming IO-540-G1A5; Propellers: Hartzell HC-A3XK-2C/8433-10 or HC A3XK-2B/7636D-4; Data required: Doyn approved Drawing List 2200.
TC Nos.: 1A10
Models: The New Piper Aircraft Inc.PA-23-250
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA179CE	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Installation of the following: Lycoming IO-540-A1A5 or IO-540-G1A5 engines, Hartzell HC-A3XK-2C/8433-10 or HC-A3XK-2B/7636D-4 propellers.
TC Nos.: 1A10
Models: The New Piper Aircraft Inc.PA-23-250
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA272CE	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Installation of Lycoming IO-360-B1A engines and Hartzell HC-C2YK-2RA/7666A-2 propellers. Gross weight increase to 4000 lbs.
TC Nos.: 1A10
Models: The New Piper Aircraft Inc.PA-23-160
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA272CE	Status: Historical	App Date: 08/27/1964	Rev Date: 05/12/2011
Description: Installation of Lycoming IO-360-B1A engines and Hartzell HC-C2YK-2RA/7666A-2 propellers. Gross weight increase to 4000 lbs. Data required: Eight photographs for Doyn 180 HP Piper Apache Fuel Injection dated May 20, 1964. Doyn dwg. 1800, Rev. C dated 3/23/62, except for propeller specified and fuel system (dwg. 1807). Hartzell Type Certification Data Sheet P-920-5 for propeller installation.
TC Nos.: 1A10
Models: Piper Aircraft Inc.PA-23-160
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA285CE	Status: Historical	App Date:	Rev Date: 05/12/2011
Description: Installation of Lycoming IO-360-B1B engines and Hartzell HC-C2YR-2RA/7666A-2 propellers. Gross weight increase to 3684 lbs on PA-23 and 4000 lbs on PA-23-160. Data required: PA-23: Doyn dwg 1500, Rev. C, except for Hartzell HC-922K-2B/8447-12A props. Doyn dwg 1507, Rev. C, PA-23-160: Doyn dwg. 1800, Rev. C, except for Hartzell HC-922K-2B/8447-12A props. Dwg. 1807, Rev. C.
TC Nos.: 1A10
Models: Piper Aircraft Inc.PA-23, PA-23-160
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA285CE	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Lycoming IO-360-B1B engines and Hartzell HC-C2YK-2RA/7666A-2 propellers. Gross weight increase to 3,684 lbs. on PA-23 and to4,000 lbs. on PA-23-160.
TC Nos.: 1A10
Models: The New Piper Aircraft Inc.PA-23, PA-23-160
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA2CE	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Installation of Doyn Model 1600 dorsal fin.
TC Nos.: 1A10
Models: The New Piper Aircraft Inc.PA-23, PA-23-160
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-126	Status: Historical	App Date:	Rev Date: 05/12/2011
Description: Lycoming O-340-A1A engine and Hartzell HC-82XG-1DB/8433-12 propeller.
TC Nos.: 3A12
Models: Cessna Aircraft Company172
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-126	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Lycoming O-340-A1A engine and Hartzell HC-82XG-1DB/8433-12 propeller.
TC Nos.: 3A12
Models: The Cessna Aircraft Company172 Series
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-13	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Install 170 hp Lycoming O-340-A1A engine and Hartzell HC-82XL-1DB/8433-12 propeller.
TC Nos.: A-799
Models: The Cessna Aircraft Company170A, 170B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-13	Status: Historical	App Date: 12/31/1956	Rev Date: 05/12/2011
Description: Install 170 hp Lycoming O-340-A1A engine and Hartzell HC-82XL-1DB/8433-12 propeller according to Doyn data listed on Engineering Releases 100 (3/22/58), 1010 (3/16/57), 1011 (8/28/57), 1012 (7/15/57), 1014 (3/30/57), 1050 (7/13/57), 1051 (& DCN 1, 12/10/57), 1052 (7/19/57), 1053 (7/19/57), 1099 (3/22/58), and Instructions (2 sheets, undated) Data required for parts manufacture: As listed on Engineering Releases 1001 (1/18/57), 1002 (12/21/57), 1003 (5/1/57), 1004 (7/13/57), 1005 (7/12/57), 1006 (3/30/57), 1007 (4/12/57), 1008 (2/27/57), 1009 (10/23/57), 1015 (2/25/56).
TC Nos.: A-799
Models: The Cessna Aircraft Company170A, 170B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-333	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Installation of Doyn fiberglass wheel fairings.
TC Nos.: 3A12, 3A13, 3A17, 5A6, A-799
Models: The Cessna Aircraft Company170, 172, 175, 180, 182
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-363	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Installation of Doyn fiberglass wheel fairings.
TC Nos.: 1A6
Models: The New Piper Aircraft Inc.PA-22 Series
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-571	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Lycoming O-360-A1D engine, McCauley 2D36C14/78KM-4 or Hartzell HC-C2YK-1A/7666-2 propellers.
TC Nos.: 3A12
Models: The Cessna Aircraft Company172, 172A, 172B, 172C, 172D, 172E, 172F (USAF T-41A), 172G, 172H (USAF T-41A)
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-571	Status: Historical	App Date: 11/11/1959	Rev Date: 05/12/2011
Description: Lycoming O-360-A1D engine, McCauley 2D36C14/78KM-4 or Hartzell HC-C2YK-1A/7666-2 propellers.
TC Nos.: 3A12
Models: The Cessna Aircraft Company172, 172A, 172B, 172C, 172D, 172E, 172F (USAF T-41A), 172G, 172H (USAF T-41A)
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-672	Status: Historical	App Date: 07/25/1961	Rev Date: 05/12/2011
Description: Installation of Lycoming O-360-A1A, A1D, or B1B engine with McCauley 2D36C14-X/78KM-4 propeller or Lycoming O-360-A1A and A1D engines with Hartzell HC-C2YK-1A/7666A-2 propeller. Data required: Doyn Aircraft, Inc. Drawings: 1000, 1005 Rev. C, 1006 Rev. C, 1009, 1010 Rev. A, 1011, 1012 Rev. A, 1013, 1014, 1015, 1016, 1099, 1100 Rev. B, 1101 Rev. A, 1102, 1103 Rev. A, 1104, 1107, 1150. Drawing Changes Notices: 1005-5A, 1006-8A, 1006-6, 1009-2A, 1199-1A, 1199-2A, and 1199-3A.
TC Nos.: A-799
Models: The Cessna Aircraft Company170A, 170B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-672	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Lycoming O-360-A1A, A1D or B1B engine and McCauley2D36C14-X/78KM-4 propeller or Lycoming O-360-A1A and A1D engines with Hartzell HC-C2YK-1A/7666A-2 propeller.
TC Nos.: A-799
Models: The Cessna Aircraft Company170A, 170B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-674	Status: Historical	App Date: 07/21/1961	Rev Date: 05/12/2011
Description: Installation of Lycoming O-360-A1D engine and McCauley 2D36C14/78KM-4 or Hartzell HC-C2YK-1A/7666-2 propeller in accordance with Doyn Aircraft Drawing List for Model 1700 conversion dated May 6, 1964; for Cessna Model 175B: Atlas Aviation Oil Cooler Installation dated September 12, 1967, is required.
TC Nos.: 3A17
Models: Cessna Aircraft Company175, 175A, 175B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-674	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Lycoming O-360-A1D engine and McCauley 2D36C14/78KM-4 or Hartzell HC-C2YK-1A/7666-2 propeller.
TC Nos.: 3A17
Models: The Cessna Aircraft Company175, 175A, 175B
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-690	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Installation of Doyn swept-tail asembly kit 1400.
TC Nos.: 3A12
Models: The Cessna Aircraft Company172 Series
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500

STC Holder: KWAD Company 4530 Jettridge Dr. N.W., Atlanta, GA 30327, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3-691	Status: Historical	App Date:	Rev Date: 03/09/1979
Description: Installation of Doyn swept-tail assembly kit 1400.
TC Nos.: 3A17
Models: The Cessna Aircraft Company175 Series
ACO: Atlanta ACO Branch, Tel: +1 (404) 474-5500