Pressure System Table - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE X-I. PRESSURE SYSTEM
Cause
Remedy
Trouble
Pressure
drops
extremely low with
single pump operation.
(Note
- pneumatic
system
inoperative
lights
for any
indication.)
During single engine
operation, pneumatic
system
inoperative
light does not come on
inoperative engine.
No pressure gauge
indication at
instrument.
No pressure gauge
indication at
instrument.
No pressure gauge
indication at the
instrument or
source.
Low system pressure.
High system pressure.
Manifold check valve
leaking.
Leaking manifold check
valve.
Pump inoperative. Dis-
connected, broken or
restricted lines.
Hose from instrument
to gauge leaking or
restricted.
Faulty gauge. Mal-
functioning regulator
valve or pump.
Regulator valves incor-
rectly adjusted. Leak-
ing of the system lines
or fitting.
Regulator valve incor-
rectly adjusted.
Check operation of
valve and replace if
necessary.
Check operation of
valve and replace if
necessary.
Replace pump. Locate
trouble and correct.
Check all lines and
connections.
Check operation of in-
strument. If operation
is faulty, replace gauge.
If instrument is not
faulty, check operation
of pump and regulator
valve.
Adjust regulator valves
in accordance with
Adjustments of this
section. Check all
lines and fittings.
Adjust in accordance
with Adjustments of
this section.
Reissued: 9/23/80
INSTRUMENTS
3B7