The STC search system is a complimentary service provided to the aviation community. We hope you find it useful. We do not provide access to STC engineering. For that you need to contact the STC holder directly. Our primary product is a comprehensive library of aviation regulations and standards, including tools for generating Airworthiness Directive compliance reports.

No. of STCs: 3

STC Holder: Excalibur 421 LLC 335 Santa Bella, Paso Robles, CA 93446, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA1361SO	Status: Historical	App Date: 04/30/1980	Rev Date: 07/19/2012
Description: Replaces original reciprocating engines with Pratt & Whitney of Canada PT6A-135 or PT6A-112 turbopropeller engines and related changes.
TC Nos.: A7CE
Models: Cessna Aircraft Company421C
ACO: Los Angeles ACO Branch, Tel: +1 (562) 627-5200

STC Holder: Excalibur 421 LLC 335 Santa Bella, Paso Robles, CA 93446, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA1807NM	Status: Historical	App Date: 12/31/1981	Rev Date: 02/13/2013
Description: Installation of two 68.5 U. S. Gallon usable fuel nacelle tanks and fuel system
TC Nos.: A7CE
Models: Cessna Aircraft Company421
ACO: Los Angeles ACO Branch, Tel: +1 (562) 627-5200

STC Holder: Excalibur 421 LLC 4550 South El Pomar Road, Templeton, CA 93465, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA1807NM	Status: Current	App Date: 12/31/1981	Rev Date: 04/13/2017
Description: Installation of two 68.5 U. S. Gallon usable fuel nacelle tanks and fuel system
TC Nos.: A7CE
Models: Cessna Aircraft Company421
ACO: AIR-770: West Certification Branch LA