Robinson R22 – Bad Tach Bypass Circuit (Video)

Engine running battery and alternator off - bad tachs bypass circuit

Engine running master and alternator off – bypass tach bypass circuit not working properly

Maintenance Notes

Outcome: Grounded

bad diode = bad tach bypass circuit

These notes reflect reported observations at the time of submission and are provided for educational purposes only. They are not a determination of airworthiness and do not constitute maintenance or regulatory advice.

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