Parts · Heating, ice protection and utility systems

Bypass Valve

116 failure reports named the bypass valve in the last ten years, 376 since 1995, most often on the Airbus Helicopters EC-135 now H135; the condition most often found was "failed". 35 FAA approvals let 11 companies make a replacement bypass valve, Hartzell Engine Technologies LLC holding the most (18).

Reports by year

Reports by year, as a table

	reports
1995	15
1996	10
1997	16
1998	8
1999	5
2000	8
2001	10
2002	8
2003	8
2004	7
2005	4
2006	11
2007	15
2008	18
2009	12
2010	14
2011	15
2012	25
2013	21
2014	14
2015	16
2016	10
2017	5
2018	10
2019	12
2020	13
2021	9
2022	6
2023	11
2024	13
2025	12
2026	15

Which system the reports file it under last ten years

Heating, ice protection and utility systems44Engine36Landing gear26Flight controls5Fuel system2Airframe structure2Rotorcraft systems1

Reports by system, as a table

	reports
Heating, ice protection and utility systems	44
Engine	36
Landing gear	26
Flight controls	5
Fuel system	2
Airframe structure	2
Rotorcraft systems	1

Models most often reporting it last ten years

Models most reported, as a table

	reports
Airbus Helicopters EC-135 now H135	18
Boeing 767	15
Airbus A319	10
Airbus A320	9
Boeing 737	9
Airbus A321	8
Bombardier CL-600 Challenger and CRJ	6
Boeing 777	5
Embraer ERJ 170 E170 and E175	5
Boeing 757	4
Bombardier BD-100 Challenger 300 and 350	3
Agusta Aerospace Corp AW119	2

How it failed the condition found, last ten years

failed22faulted19leaking12malfunctioned11defective10inoperative9faulty5unserviceable4cracked3bypassing2

Conditions found, as a table

	reports
failed	22
faulted	19
leaking	12
malfunctioned	11
defective	10
inoperative	9
faulty	5
unserviceable	4
cracked	3
bypassing	2

Engines most often reporting it

Pratt & Whitney Canada PW206B2 9 Pratt & Whitney Canada PW150A 5 Pratt & Whitney Canada PT6B-37A 3 Pratt & Whitney Canada PW206B 3 Allison (Rolls-Royce) 250-C47B 1 Allison (Rolls-Royce) 501-D13 series 1 General Electric CF6-80C2B6 1 Lycoming O-235-L2C 1 Pratt & Whitney Canada PW207C 1 Pratt & Whitney Canada PW305A 1

Approved replacement parts 35 parts manufacturer approvals

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

Hartzell Engine Technologies LLC 18 Honeywell International US LLC 7 Shimadzu Precision Instruments, INC. 2 Whippany Actuation Systems LLC 1 United Technologies, Hamilton Sundstrand 1 Triumph Actuation Systems LLC (Formerly Frisby Aerospace) 1 Shimadzu Precision Instru INC 1 Parker Hannifin CORP 1 Honeywell International INC. 1 F H INC 1 Eaton Aerospace Sterer Engineering 1

For these models most: Cessna 402 (10), Cessna 401 (7), Cessna 335 (7), Cessna 421 Golden Eagle (6), Cessna 414 Chancellor (6), Cessna 340 (4), Cessna TU206 (3), Cessna T210 Turbo Centurion (3), Cessna T207 (3), Cessna P210 Pressurized Centurion (3), Cessna 404 (3), Boeing 767 (3).

Maker	Part	Replaces	Fits	Granted	Status
Shimadzu Precision Instruments, INC.	Bypass Valve, Motor Operated 732-18600-02	S256T005-8	The Boeing Company 767-200	2023-11-27	current
Honeywell International INC.	Bypass Valve 398626-1-1	398626-1-1	Fokker Services B.V. F28 Mark 1000, F28 Mark 2000, F28 Mark 3000	2023-04-05	current
Triumph Actuation Systems LLC (Formerly Frisby Aerospace)	Bypass Valve 1FA01137-3	48301-3	DE Havilland Aircraft DHC-8-400	2022-11-23	current
Shimadzu Precision Instruments, INC.	Bypass Valve, Motor Operated 732-18600-02	732-18600-02	Boeing 767-200	2015-05-14	current
Whippany Actuation Systems LLC	Bypass Valve Actuator R4055	H10368627SC	Airbus A380-841, A380-842, A380-861	2015-05-12	current
Hartzell Engine Technologies LLC	Bypass Valve 470780-0015	Cessna Aircraft 5050154-15	Cessna 335, 401, 401A	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470830-0010	Cessna Aircraft C165006-0401	Cessna 421A, 421B	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 481064-0001	Cessna Aircraft C165006-0113	Cessna 421C	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470830-0020	Cessna Aircraft C165006-0402	Cessna 335, 401, 401A	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470780-0016	Cessna Aircraft 5050154-16	Cessna 335, 401, 401A	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0015	Cessna Aircraft C165006-0109	Cessna 404	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0011	Cessna Aircraft C165006-0105	Cessna 206 A thru C, T, P	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0012	Cessna Aircraft C165006-0106	Cessna P210N, P 340A, 414	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0013	Cessna Aircraft C165006-0107	Cessna 340A, 402C, 414	2013-02-24	current
Hartzell Engine Technologies LLC	Bypass Valve 470780-0016	Cessna Aircraft 5050154-16	Cessna 335, 401, 401A	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0011	Cessna Aircraft C165006-0105	Cessna 206 A thru C, T, P	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 470830-0020	Cessna Aircraft C165006-0402	Cessna 335, 401, 401A	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 481064-0001	Cessna Aircraft C165006-0113	Cessna 421C	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 470830-0010	Cessna Aircraft C165006-0401	Cessna 421A, 421B	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0015	Cessna Aircraft C165006-0109	Cessna 404	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 470780-0015	Cessna Aircraft 5050154-15	Cessna 335, 401, 401A	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0013	Cessna Aircraft C165006-0107	Cessna 340A, 402C, 414	2010-10-21	current
Hartzell Engine Technologies LLC	Bypass Valve 470908-0012	Cessna Aircraft C165006-0106	Cessna P210N, P 340A, 414	2010-10-21	current
Shimadzu Precision Instru INC	Bypass Valve Module 732-18600-02	S256T006-10	Boeing 767-200	2000-11-27	current
Eaton Aerospace Sterer Engineering	L.G. Bypass Valve 69220	69220	deHavilland DHC-8-101	2000-11-07	current
F H INC	Bypass Valve 4391 H1	Fokker Services B.V. 4391 H1	Fokker F28MK0070, MK0100	2000-08-30	current
Parker Hannifin CORP	Bypass Valve 3910027-103	Boeing Commercial Airplane Group S293W110-1	Boeing 777-200 Series, 777-300 Series	1999-07-28	current
Honeywell International US LLC	Bypass Valve 470830-0010, 470830-0020	Cessna C165006-0401 C165006-0402	Cessna 421(A), 421(B)	1996-07-10	current
Honeywell International US LLC	Bypass Valve 481064-0001	Cessna C165006-0113	Cessna 421C	1996-07-10	current
Honeywell International US LLC	Bypass Valve 470908-0011	Cessna C165006-0105	Cessna T(P, U) 206A-C, T(P	1996-07-10	current
Honeywell International US LLC	Bypass Valve 470908-0013	Cessna C165006-0107	Cessna 340A, 402C, 414	1996-07-10	current
Honeywell International US LLC	Bypass Valve 470908-0015	Cessna C165006-0109	Cessna 404	1996-07-10	current
Honeywell International US LLC	Bypass Valve 470908-0012	Cessna C165006-0106	Cessna P210N, P Engine, 340A	1996-07-10	current
Honeywell International US LLC	Bypass Valve 470780-0015, 470780-0016	Cessna 5050154-15 5050154-16	Cessna 335, 401, 401A	1996-07-10	current
United Technologies, Hamilton Sundstrand	Bypass Valve 754751-2	No unique Piaggio part number	Industrie... P-180	1992-05-17	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.