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No. of STCs: 6

STC Holder: Williams Barbara or Bob PO Box 431, 213 N Clark, Udall, KS 67146, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA1558SW	Status: Current	App Date: 06/06/1972	Rev Date: 01/28/1982
Description: Installation of vortex generators, wing leading edge cuffs, wing tips, fairings, de-icing boots and stall strips.
TC Nos.: A6CE
Models: Cessna Aircraft Company337, 337A, 337B, 337C, 337D, 337E, 337F, 337G, 337H, P337H, T337B, T337G, T337H-SP
ACO: AIR-760: Central Certification Branch WI

STC Holder: Williams Barbara or Bob PO Box 431, 213 N Clark, Udall, KS 67146, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA1568SW	Status: Current	App Date: 08/29/1972	Rev Date: 09/05/1979
Description: Installation of wing leading edge cuff, flow fences, optional wing tips and dorsal fin.
TC Nos.: A3SO
Models: Piper Aircraft Inc.PA-32-260, PA-32-300
ACO: AIR-760: Central Certification Branch WI

STC Holder: Williams Barbara or Bob PO Box 431, 213 N Clark, Udall, KS 67146, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA420CE	Status: Historical	App Date: 01/28/1966	Rev Date: 09/05/1979
Description: Installation Lycoming O-360-A1A or A1D engine and McCauley 2D36C14/78KM-4 propeller or Hartzell HC-C2YK-1B/766602 propeller.
TC Nos.: 3A12
Models: The Cessna Aircraft Company172, 172A, 172B, 172C, 172D, 172E, 172F (USAF T-41A), 172G, 172H (USAF T-41A)
ACO: Wichita ACO Branch, Tel: +1 (316) 946-4100

STC Holder: Williams Barbara or Bob PO Box 431, 213 N Clark, Udall, KS 67146, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA421CE	Status: Current	App Date: 01/28/1966	Rev Date: 07/20/1993
Description: Installation of a Lycoming O-360-A1A or O-360-A1D 180 hp engine or O-360-B1B 168 hp engine and constant speed propeller
TC Nos.: A-799
Models: The Cessna Aircraft Company170A, 170B
ACO: AIR-760: Central Certification Branch WI

STC Holder: Williams Barbara or Bob PO Box 431, 213 N Clark, Udall, KS 67146, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA424CE	Status: Historical	App Date: 01/28/1966	Rev Date: 09/05/1979
Description: Installation of Lycoming O-360-A1A or O-360-A1D engine and Hartzell HC-C2YK-1A/7666-2, HC-92ZK-8D/8447-12A or McCauley 2D36C14/78KM-4 propeller
TC Nos.: 3A17
Models: The Cessna Aircraft Company175, 175A, 175B
ACO: AIR-7K0: Wichita ACO Branch

STC Holder: Williams Barbara or Bob PO Box 431, 213 N Clark, Udall, KS 67146, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA545CE	Status: Current	App Date: 12/11/1967	Rev Date: 02/22/1989
Description: Installation of Lycoming O-360(180 h.p.) engine and new Hartzell Sensenich or McCauley propellers. Delete limitation pertinent to utility category operation.
TC Nos.: A13CE
Models: Cessna Aircraft Company177
ACO: AIR-760: Central Certification Branch WI