Piper Navajo PA-31 Service Manual page 666

PIPER NAVAJO SERVICE MANUAL
TABLE X-II. TROUBLESHOOTING CHART (INSTRUMENTS) (cont.)
Trouble
I
Cause
Remedy
ALTIMETER (cont.)
Cracked or loose cover
glass.
Excessive vibration.
Replace instrument.
Dull or discolored
luminous markings.
Age.
Replace instrument.
Barometric scale and
reference markers
out of synchronism.
Barometric scale and
reference
markers out
of synchronism with
pointers.
Slippage of mating
parts.
Drift in mechanism.
Replace instrument.
Refer to the latest
revision of
AC 43.13-1.
AIRSPEED TUBES AND INDICATOR
Tube does not heat or
clear itself of ice with
switch "ON".
Circuit breaker
popped.
Open circuit.
Reset.
Repair.
Excessive voltage
drop between battery
and pitot head.
Heating element
burned out.
Check voltage at pitot
head.
Replace pitot head.
Pointers of static in-
struments do not
indicate properly.
Leak in instrument
case or in pitot
lines.
Check for leak and seal.
Revised: 9/24/81 INSTRUMENTS.
3E4