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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