Parts · Engine

Thermal Bypass

2 failure reports named the thermal bypass in the last ten years, 3 since 2010, most often on the Airbus Helicopters EC-135 now H135; the condition most often found was "failed". 4 FAA approvals let 2 companies make a replacement thermal bypass, Parker Hannifin CORP holding the most (3).

Reports by year

Reports by year, as a table

	reports
2010	1
2016	2

Which system the reports file it under last ten years

Engine2

Reports by system, as a table

	reports
Engine	2

Models most often reporting it last ten years

Airbus Helicopters EC-135 now H1351Piper PA-31 Navajo and Chieftain1

Models most reported, as a table

	reports
Airbus Helicopters EC-135 now H135	1
Piper PA-31 Navajo and Chieftain	1

How it failed the condition found, last ten years

failed1loose1

Conditions found, as a table

	reports
failed	1
loose	1

Engines most often reporting it

Lycoming LTIO-540-J2BD 1Pratt & Whitney Canada PW206B2 1

Approved replacement parts 4 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a thermal bypass and sell it as an approved part for the models named. These are the companies holding such approvals for a thermal bypass:

Parker Hannifin CORP 3United Technologies, Hamilton Sundstrand 1

Maker	Part	Replaces	Fits	Granted	Status
Parker Hannifin CORP	Thermal Bypass Valve 975244-3	GX473-0105-3	Bombardier Inc. Canadair) (BD-700-1A10	2011-10-23	current
Parker Hannifin CORP	Thermal Bypass Valve 975244-3	GX473-0105-3	Bombardier Inc. Canadair) (BD-700-1A10	2011-10-23	current
Parker Hannifin CORP	Thermal Bypass Valve 975244-3	GX473-0105-3	Bombardier Inc. Canadair) (BD-700-1A10	2011-10-17	current
United Technologies, Hamilton Sundstrand	Thermal Bypass Valve, GTA67-1 1001807-2	5405342	Pratt & Whitney PW6122-1D, PW6124	2002-10-03	current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.