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: Marlin and Myron Harms (No address provided), Unknown, NM REGION Unknown, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA4-1404	Status: Current	App Date:	Rev Date: 01/01/1960
Description: Vacuum system 121 and 121A. (Eligible only on engines with dampened crankshafts).
TC Nos.: 3A12, A-799
Models: The Cessna Aircraft Company170, 172 Series
ACO: AIR-770: West Certification Branch SEA

STC Holder: Marlin and Myron Harms (No address provided), Unknown, NM REGION Unknown, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA4-1404	Status: Historical	App Date:	Rev Date:
Description: Vacuum system 121 and 121A. (Eligible only on engines with dampened crankshafts).
TC Nos.: 3A12, A-799
Models: The Cessna Aircraft Company170, 172 Series
ACO: Seattle ACO Branch, Tel: +1 (206) 231-3500