PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 1
Nov 30/06
5D23
77-10-00
POWER
Tachometer Indicator
NOTE: In S/N’s 2842218 and up, for airplanes equipped with the Avidyne Entegra EFIS, engine data is
collected by the Data Acquisition Unit (DAU) and is displayed on the Multi-Function Display
(MFD) and Primary Flight Display (PFD). A tachometer generator is installed on the left
magneto to provide data to the DAU.
A. Description
The tachometer is connected to engine accessory case by a flexible cable and provides a reading
of crankshaft speed in revolutions per minute. The instrument has a mechanism for recording and
displaying engine operating time. The time recorder will be accurate (i. e., records 1:00 hour in 60
minutes) at 75% power setting under standard sea level conditions.
B. Troubleshooting
See Chart 1.
CHART 1
TROUBLESHOOTING TACHOMETER
Trouble Cause Remedy
No reading on indicator, either Broken shaft. Replace instrument.
permanent or intermittent.
Loose cable connections. Tighten cable.
Pointer oscillates excessively. Rough spot on, or sharp bend Repair or replace.
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 stop; Excessive lubricant in Replace instrument.
more noticeable in cold weather. instrument.
Pointer jumps at idle. Speed cup hitting rotating Replace instrument.
magnet.
Tachometer cable breaks. Cable bent too sharply. Reroute cable.
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