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: 6

STC Holder: Leth & Associates 85 222nd Place SE, Sammamish, WA 98074, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA3437NM	Status: Current	App Date: 06/23/1986	Rev Date: 07/16/2002
Description: Modification to permit an increase in maximum allowable zero fuel weight of DC-8-62 airplanes, (1) which are certified to a 335,000 lbs. maximum takeoff gross weight or (2) which are certified to a 350,000 lbs. maximum takeoff gross weight.
TC Nos.: 4A25
Models: McDonnell Douglas CorporationDC-8-62
ACO: AIR-770: West Certification Branch LA

STC Holder: Leth & Associates 85 222nd Place SE, Sammamish, WA 98074, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA4844NM	Status: Current	App Date:	Rev Date: 03/01/1990
Description: Modification in accordance with FAA-approved data to permit an increase in maximum landing weight above 2,000 ft.
TC Nos.: 4A25
Models: McDonnell Douglas CorporationDC-8-63
ACO: AIR-770: West Certification Branch SEA

STC Holder: Leth & Associates 85 222nd Place SE, Sammamish, WA 98074, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA4912NM	Status: Current	App Date: 04/14/1990	Rev Date: 03/27/1990
Description: Increase in the maximum zero fuel weight.
TC Nos.: A3WE
Models: The Boeing Company727-100 Series
ACO: AIR-770: West Certification Branch SEA

STC Holder: Leth & Associates 85 222nd Place SE, Sammamish, WA 98074, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: ST00094SE	Status: Current	App Date:	Rev Date: 05/31/1994
Description: Increase in the maximum zero fuel weight.
TC Nos.: A3WE
Models: The Boeing Company727-200 Series
ACO: AIR-770: West Certification Branch SEA

STC Holder: Leth & Associates 85 222nd Place SE, Sammamish, WA 98074, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: ST01857SE	Status: Current	App Date: 06/19/2006	Rev Date: 12/19/2014
Description: Increase of the Maximum Zero Fuel Weight
TC Nos.: A2NM
Models: The Boeing Company757-200 Series
ACO: AIR-770: West Certification Branch SEA

STC Holder: Leth & Associates 85 222nd Place SE, Sammamish, WA 98074, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: ST01857SE	Status: Historical	App Date: 06/19/2006	Rev Date: 07/03/2008
Description: Increase of the Maximum Zero Fuel Weight of Boeing 757-200 series aircraft converted under Precision Conversions, LLC, STC Number ST01529SE,
TC Nos.: A2NM
Models: The Boeing Company757-200 Series
ACO: Seattle ACO Branch, Tel: +1 (206) 231-3500