CHART 3701. TROUBLESHOOTING (VACUUM SYSTEM)
Trouble Cause Remedy
Vacuum correct on ground Vacuum pump mal- Replace pump.
but will not maintain pres- functioning.
sure at altitude.
Regulator sticky. Clean regulator.
Vacuum correct but pilot Regulator sticky. Clean regulator.
reports pressure erratic or
shows complete loss in
flight.
Oil in pump due to leaky Replace pump.
engine seal or cleaning fluid
blown into pump while
cleaning engine.
Pressure can only be main- Leak in system. Repair or replace lines.
tained at full throttle on
ground.
Worn pump. Replace pump.
Stuck regulator. Clean or replace regulator.
Normal pressure indica- Faulty flight instrument. Replace instrument.
tion but sluggish operation
of instruments.
High system pressure. Vacuum regulator in- Adjust regulator.
correctly adjusted.
Vacuum regulator sticking Clean and check operation
or dirty filter. of regulator.
Regulator cannot be ad- Lines leaking. Check lines and fittings.
justed to produce correct
pressure.
Vacuum pump mal- Replace pump.
functioning.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
3 7 - 0 2 - 0 0
Page 37-03
Revised: May 15, 1989
2K10
PIPER AIRCRAFT
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