Parts · Engine

Tach Generator

20 failure reports named the tach generator in the last ten years, 235 since 1995, most often on the Bell 206 JetRanger and LongRanger; the condition most often found was "failed". 3 FAA approvals let 3 companies make a replacement tach generator, Scott'S-Bell 47 INC. holding the most (1). The reports call it "tach generator", "tach-generator".

Reports by year

Reports by year, as a table

	reports
1995	11
1996	19
1997	40
1998	25
1999	19
2000	7
2001	13
2002	21
2003	16
2004	8
2005	4
2006	6
2007	4
2009	3
2010	4
2011	8
2012	1
2013	1
2014	4
2015	1
2016	3
2017	2
2018	1
2019	5
2020	1
2022	1
2023	1
2024	1
2025	4
2026	1

Which system the reports file it under last ten years

Engine12Landing gear3Rotorcraft systems3Propeller1Heating, ice protection and utility systems1

Reports by system, as a table

	reports
Engine	12
Landing gear	3
Rotorcraft systems	3
Propeller	1
Heating, ice protection and utility systems	1

Models most often reporting it last ten years

Bell 206 JetRanger and LongRanger3Boeing 7573Robinson R442Agusta Aerospace Corp AW1191Airbus A3191Airbus A3201Airbus A3211Beechcraft 1900 Airliner1Boeing 7671Cessna 3401Mcdonnell Douglas Aircraft Co MD-881Piper PA-44 Seminole1

Models most reported, as a table

	reports
Bell 206 JetRanger and LongRanger	3
Boeing 757	3
Robinson R44	2
Agusta Aerospace Corp AW119	1
Airbus A319	1
Airbus A320	1
Airbus A321	1
Beechcraft 1900 Airliner	1
Boeing 767	1
Cessna 340	1
Mcdonnell Douglas Aircraft Co MD-88	1
Piper PA-44 Seminole	1

How it failed the condition found, last ten years

failed4faulty2inoperative2seized2broken1defective1false indication1fluctuates1intermittent1leaking1

Conditions found, as a table

	reports
failed	4
faulty	2
inoperative	2
seized	2
broken	1
defective	1
false indication	1
fluctuates	1
intermittent	1
leaking	1

Engines most often reporting it

Allison (Rolls-Royce) 501-D22 1Continental TSIO-520-NB 1Lycoming IO-540-AE1A5 1Lycoming LO-360-A1H6 1Lycoming O-360-J2A 1Lycoming O-540-F1B5 1Pratt & Whitney Canada PT6A-140 1Pratt & Whitney Canada PT6B-37A 1Rolls-Royce RB-211-22 1Rolls-Royce RB211-535E4 1

Approved replacement parts 3 parts manufacturer approvals

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

Scott'S-Bell 47 INC. 1Ametek Aerospace and Defense, A Division of Ametek INC. 1Ametek Aerospace 1

For these models most: Boeing 767 (2), Bell 47 (1), Bell-Carson 47 (1).

Maker	Part	Replaces	Fits	Granted	Status
Scott'S-Bell 47 INC.	N2 Tach Generator Shear Shaft SB47-660-2354-2	660-2354-2	Scotts-Bell 47 Inc. 47G-2A, 47G-2A-1, 47G-3B	2016-07-06	current
Ametek Aerospace and Defense, A Division of Ametek INC.	Tach Generator 2CM17AAB1	Boeing S332T302-2	Boeing 767-200, -300 (TC A1NM)	1991-10-09	current
Ametek Aerospace	Tach Generator 2CM17AAB1	Boeing S332T302-2	Boeing 767-200, -300 (TC A1NM)	1991-10-08	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.