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: 5

STC Holder: Diamond Upgrades, LLC 920 North King Street 2nd Floor, Wilmingon, DE 19801, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH7961SW-D	Status: Current	App Date: 04/28/1989	Rev Date: 04/17/2013
Description: Installation of two Allison 250-C20R engines.
TC Nos.: H11EU
Models: Eurocopter FranceAS355F1
ACO: AIR-750: East Certification Branch NY

STC Holder: Diamond Upgrades, LLC 920 North King Street 2nd Floor, Wilmingon, DE 19801, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH7962SW-D	Status: Current	App Date: 01/24/1989	Rev Date: 04/17/2013
Description: Installation of two Allison 250-C20R engines and enhanced antitorque system.
TC Nos.: H11EU
Models: Eurocopter FranceAS355F2
ACO: AIR-750: East Certification Branch NY

STC Holder: Diamond Upgrades, LLC 920 North King Street 2nd Floor, Wilmingon, DE 19801, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR01124LA	Status: Historical	App Date: 12/01/2000	Rev Date: 08/05/2013
Description: Installation of Pratt & Whitney PT6T-3DE, or -3DF Twin-Pac in place of PT6T-3 or PT6T-3B Twin-Pac
TC Nos.: H4SW
Models: Bell Helicopter Textron212
ACO: Los Angeles ACO Branch, Tel: +1 (562) 627-5200

STC Holder: Diamond Upgrades, LLC 920 North King Street 2nd Floor, Wilmingon, DE 19801, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR01124LA	Status: Historical	App Date: 12/01/2000	Rev Date: 10/11/2012
Description: Installation of Pratt & Whitney PT6T-3DF Twin-Pack in place of PT6T-3B Twin-Pack.
TC Nos.: H4SW
Models: Bell Helicopter Textron212
ACO: Los Angeles ACO Branch, Tel: +1 (562) 627-5200

STC Holder: Diamond Upgrades, LLC 920 North King Street 2nd Floor, Wilmingon, DE 19801, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR01180LA	Status: Current	App Date: 04/22/2001	Rev Date: 10/11/2012
Description: Installation of Pratt & Whitney PT6T-3DF Twin-Pack in place of PT6T-3B, -3BE, -3BF, -3BG Twin Pack
TC Nos.: H4SW
Models: Bell Helicopter Textron412
ACO: AIR-770: West Certification Branch LA