Piper Navajo PA-31 Service Manual page 667

PIPER NAVAJO SERVICE MANUAL
TABLE X-II.
TROUBLESHOOTING CHART (INSTRUMENTS) (cont.)
Trouble
I
Cause
I
Remedy
AIRSPEED TUBES AND INDICATOR (cont.)
Point of instrument
oscillates.
Leak in instrument
case or in pitot lines.
Check for leak and seal.
RATE OF CLIMB INDICATOR
Pointer does not set on
zero.
-Pointer
fails to re-
spond.
Pointer oscillates.
Aging of diaphragm.
Obstruction
in static
line.
Leaks in static line.
Reset pointer to zero by
means of setting screw
tap instrument
while
resetting.
Disconnect all instru-
ments connected to the
static line.
Check individual instru-
ments for obstruction
in lines.
Disconnect all instru-
ments connected to the
static line.
Check
individual instruments
for leaks.
Reconnect
instruments
to static
line and test instal-
lation for leaks.
Defective mechanism.
Replace instrument.
Reissued: 10/12/79
3E5
INSTRUMENTS