The U.S. aircraft register, updated daily
Parts

By Pass

0 failure reports named the by pass in the last ten years, 9 since 1996. 33 FAA approvals let 10 companies make a replacement by pass, Hartzell Engine Technologies LLC holding the most (15). The reports call it "by pass switch", "by pass light", "by pass line", "by pass valve", "by-pass switch" and 1 other ways.

Reports by year

01234219961241999
Reports by year, as a table
reports
19962
19971
19982
19994

Approved replacement parts 33 parts manufacturer approvals

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

Hartzell Engine Technologies LLC 15Knisley Welding INC 6Kaiser Fluid Technologies 2Hye-Tech Manufacturing LLC 2Honeywell International INC 2Hye-Tech Manufacturing LLC 2Valcor Engineering CORP 1Honeywell International INC. 1Hye-Tech Manufacturing LLC 1Eaton Aerospace Sterer Engineering 1

For these models most: Cessna T188 (3), Cessna T210 Turbo Centurion (2), Cessna T207 (2), Bombardier CL-600 Challenger and CRJ (2), Sikorsky Aircraft Corp S-92 (1), Cessna U206 Stationair (1), Cessna TU206 (1), Cessna T206 Turbo Stationair (1), Cessna P210 Pressurized Centurion (1), Cessna P206 Super Skylane (1).

MakerPartReplacesFitsGrantedStatus
Honeywell International INC.By-Pass Valve 398230-1398230-1Fokker Services B.V. F27 Mark 100, F27 Mark 200, F27 Mark 3002023-04-05current
Hartzell Engine Technologies LLCBy-Pass Valve 470780-0015Cessna 5050154-15Textron Aviation Inc. 335, 401, 401A2022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470908-0011Cessna C165006-0105Textron Aviation Inc. 206, T206H, P206D2022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470908-0015Cessna C165006-0109Textron Aviation Inc. 4042022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 481064-0001C165006-0113Textron Aviation Inc. 421C2022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470842-0009Continental Motors 649006-9Continental... TSIO-360-RB2022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470830-0010Cessna C165006-0401 Textron Aviation Inc. 421A, 421B2022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470780-0016Cessna 5050154-16Textron Aviation Inc. 335, 401, 401A2022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470908-0013Cessna C165006-0107Textron Aviation Inc. 340A, 402C, 4142022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470830-0020Cessna C165006-0402 Textron Aviation Inc. 335, 401, 401A2022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470780-0013Cessna 5050154-13Textron Aviation Inc. 320D, SN 320D0001 and up, 4112022-03-14current
Hartzell Engine Technologies LLCBy-Pass Valve 470908-0012Cessna C165006-0106Textron Aviation Inc. P210N, 340A, 4142022-03-14current
Hye-Tech Manufacturing LLCBy-pass Valve, Sleeve 2542086HT2542086Rolls-Royce 250-C10B (T63-A-5A), C10D (T63-A-700), C182019-04-30current
Hartzell Engine Technologies LLCBy-Pass Valve Ass'y 470780-0014Cessna Aircraft By-Pass Valve 5050154-14Textron Aviation Inc. 310P, S/N P0001 and on, 310Q2017-08-14current
Hartzell Engine Technologies LLCBy-Pass Valve Ass'y 470908-0006Cessna Aircraft By-Pass Valve C165006-0104,...Textron Aviation Inc. 340, S/N 340-0001 and on2017-08-14current
Hartzell Engine Technologies LLCBy-Pass Valve Ass'y 470842-0009Continental Motors, Inc. By-Pass Valve 649006-9Continental Motors TSIO-360-RB2017-08-14current
Hartzell Engine Technologies LLCBy-Pass Valve Ass'y 470780-0013Cessna Aircraft By-Pass Valve 5050154-13Textron Aviation Inc. 320D, S/N 320D0001 and on, 4112017-08-14current
Hye-Tech Manufacturing LLCBy-pass Valve, Sleeve 2542086HT2542086Rolls-Royce 250-C10B (T63-A-5A), C10D (T63-A-700), C182015-11-22current
Valcor Engineering CORPBy Pass Valve V70900-831-292351-15809-103Sikorsky Aircraft Corporation S-92A2013-06-09current
Knisley Welding INCBy-Pass Tube K643882643882Cessna T188C, S/N T18803798T, T18803803T2008-03-26current
Knisley Welding INCBy-Pass Tube K643882643882Cessna T188C, S/N T18803798T, T18803803T2007-03-26current
Hye-Tech Manufacturing LLCBy-pass Valve Sleeve 2542086HT2542086Rolls-Royce 250-C18, C20, C20B2003-06-28current
Hye-Tech Manufacturing LLCBy-pass Valve Sleeve 2542086HT2542086Rolls-Royce 250-C18, C20, C20B2003-05-01current
Eaton Aerospace Sterer EngineeringBy-Pass Valve 7152371523Fokker F28 MARK 01002000-11-07current
Hye-Tech Manufacturing LLCBy-pass Valve Sleeve 2542086HT2542086Allison Engine 250-C18, C20, C20B2000-09-19current
Knisley Welding INCBy-Pass Tube K643882Teledyne Continental Motor Engine 643882Cessna T188C (S/N's T18803798T, T18803803T,...1996-07-28current
Kaiser Fluid TechnologiesBy-Pass and Runaround Valve 75000-4000-002Canadair 601R75160-5Bombardier, Inc. CL600-2B161996-03-21current
Kaiser Fluid TechnologiesBy-Pass and Runaround Valve 750004000-003Canadair 601R75160-5Bombardier, Inc. CL600-2B191996-03-21current
Knisley Welding INCBy Pass Assembly K640-1Continental 640964-119Teledyne Continental TSIO-360E, EB, KB LTSIO-360E1995-12-19current
Knisley Welding INCBy Pass Assembly K640-3Continental 641911-030Teledyne Continental LTSIO-360F, FB1995-12-19current
Knisley Welding INCBy-pass Assembly K1250860-78Cessna 1250860-78Cessna TU/TP206, T207, T207A1992-12-09current
Honeywell International INCBy-Pass Valve 398626-1Fokker 398626-1Fokker F.281992-10-18current
Honeywell International INCBy-Pass Valve 398230-1Fokker 398230-1Fokker F.271992-10-18current

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.