Parts · Rotorcraft systems

Dual Tachometer

57 failure reports named the dual tachometer in the last ten years, 59 since 1995, most often on the Robinson R44; the condition most often found was "defective".

Reports by year

Reports by year, as a table

	reports
1995	1
1999	1
2020	32
2021	20
2022	2
2023	2
2026	1

Which system the reports file it under last ten years

Rotorcraft systems56Engine1

Reports by system, as a table

	reports
Rotorcraft systems	56
Engine	1

Models most often reporting it last ten years

Robinson R4441Robinson R2211Robinson R664Bell 4071

Models most reported, as a table

	reports
Robinson R44	41
Robinson R22	11
Robinson R66	4
Bell 407	1

How it failed the condition found, last ten years

defective44failed6fluctuates4degraded1intermittent1reads low1

Conditions found, as a table

	reports
defective	44
failed	6
fluctuates	4
degraded	1
intermittent	1
reads low	1

Engines most often reporting it

Lycoming IO-540-AE1A5 20Lycoming O-540-F1B5 20Lycoming O-360-J2A 5Allison (Rolls-Royce) 250-C30 1Allison (Rolls-Royce) 250-C47B 1Rolls-Royce AE 3007A1 1

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.