Piper SENECA II - Page 558

PIPER SENECA II SERVICE MANUAL
01/01/09 X - INSTRUMENTS
2E14A
TABLE X-I. TROUBLESHOOTING GYRO PRESSURE SYSTEM
Trouble Cause Remedy
No pressure indication Filter clogged or Clean or replace filter.
at instrument. dirty.
Line from pump to filter Check line.
restricted or leaking.
Faulty gauge or Replace gauge.
malfunctioning pump. Replace pump.
Low system pressure. Filter dirty. Clean or replace filter.
Pressure regulator valve Adjust regulator valve
incorrectly adjusted. in accordance with
adjustments in this
section.
Line from pump to filter Repair line.
restricted or leaking.
Line from pump to Check all lines and
manifold leaking. fittings.
Pressure correct on Pump malfunctioning. Replace pump.
ground but will not
maintain pressure at Dirty filter. Replace filter.
altitude.
Regulator sticky. Clean regulator.
Pressure correct but Regulator sticky. Clean regulator.
pilot reports pressure
erratic or shows Oil in pump due to Replace pump.
complete loss in flight. leaky engine seal
or cleaning fluid
blown into pump
while cleaning engine.
Pressure can only be Leak in system. Repair or replace lines.
maintained at full
throttle on ground. Worn pump. Replace pump.
Stuck regulator. Clean or replace
regulator.
Normal pressure indication Faulty flight instrument. Replace instrument.
but sluggish
operation of instruments.
High system pressure. Regulator incorrectly Adjust regulator.
adjusted.
Regulator sticking. Clean and check operation
of regulator.