GENERAL.
The instrumentation in this airplane is designed to give a quick and actual indication of the attitude,
performance and condition of the airplane. Maintenance, other than described, shall be done by the instrument
manufacturer or an authorized repair station.
DESCRIPTION AND OPERATION.
The vacuum system employed to operate the gyro instruments is comprised of an engine driven dry
vacuum pump, a vacuum regulator and filter, and necessary tubing to connect the components. A vacuum
gauge is used to constantly monitor the system.
TROUBLESHOOTING.
A Troubleshooting Chart is provided to assist in locating and correcting possible malfunctions in the
system.
CHART 3701. TROUBLESHOOTING (VACUUM SYSTEM)
Trouble Cause Remedy
No vacuum gauge indica- Filter clogged or dirty. Clean or replace filter.
tion at instrument.
Line from gyro to filter re- Check line.
stricted.
No vacuum gauge indica- Faulty gauge malfunc- Replace gauge. Replace
tion at instrument or tioning pump. pump.
source.
Low vacuum system Filter dirty. Clean or replace filter.
pressure.
Vacuum regulator valve in- Adjust regulator valve in
correctly adjusted. accordance with Adjust-
ments in this section.
Line from gyros to filter Repair or replace line.
restricted.
Line from pump to gyros Check all lines and fittings.
leaking
37-00-02
Page 37-01
December 1, 1978
2H19
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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