TACHOMETER INDICATOR.
The tachometer is connected to the engine accessory by a flexible cable and provides an indication of
crankshaft speed in revolutions per minute. The instrument has a recording mechanism for recording the time
that the engine is in actual operation.
CHART 7702. TROUBLESHOOTING (TACHOMETER)
Trouble Cause Remedy
No reading on indicator, Broken shaft. Replace instrument.
either permanent or in-
termittent.
Loose cable connections. Tighten cable.
Pointer oscillates ex- Rough spot on, or sharp Repair or replace.
cessively. bend in shaft.
Excessive friction in Replace instrument.
instrument.
Indicator changes in climb. Excessive clearance in Replace instrument.
speed cup.
Pointer goes all the way to Excessive lubricant in in- Replace instruments.
stop, more noticeable in struments.
cold weather.
Pointer jumps at idle. Speed cup hitting rotating Replace instrument.
magnet.
Tachometer cable breaks. Cable bent too sharply. Reroute cable.
77-10-02
Page 77-02
December 1, 1978
3F19
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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