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: 2

STC Holder: Efficiency Aircraft P.O. Box 37, Kent, WA 98031, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA113NW	Status: Historical	App Date:	Rev Date: 05/24/1974
Description: Installation of EAC 3D40-401 AG-100-2 propeller with 4M121-1 propeller governor.
TC Nos.: A3SW, A4SW
Models: Ayres Corporation600 S-2D, 600 S2D
ACO: Seattle ACO Branch, Tel: +1 (206) 231-3500

STC Holder: Efficiency Aircraft P.O. Box 37, Kent, WA 98031, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA99NW	Status: Historical	App Date:	Rev Date: 03/29/1974
Description: Installation of HSP 3D40-401 hub with EAC-100-2 blades.
TC Nos.: 1A16
Models: Ag Cat CorporationG-164A
ACO: Seattle ACO Branch, Tel: +1 (206) 231-3500