Piper Comanche PA-24 User Manual

PIPER COMANCHE SERVICE MANUAL
04/01/09 XI - INSTRUMENTS
3G1
11-17. Troubleshooting.
Table XI-I. Troubleshooting Vacuum System
Trouble Cause Remedy
No vacuum pressure gauge Pump inoperative. Dis- Replace pump. Locate
indication. connected. Broken or trouble and correct.
restricted lines.
No vacuum pressure gauge Hose from instrument to Check all lines and
indication at instrument. gauge leaking or restricted. connections.
No vacuum suction gauge Faulty gauge. Malfunctioning, Check operation of instru-
indication at either regulator valve, or ments, If operation is
instrument or source. vacuum pump. normal, replace gauge.
If instruments are in-
operative, check operation
of vacuum pump or regulator
valve.
Low vacuum system Vacuum regulator valve Adjust regulator valve in
pressure. incorrectly adjusted. accordance with (Adjust-
Leaking of the system ments) of this section.
lines or fitting.
Check all lines and fittings.
Normal pressure indication, Instruments air filter Remove and clean or replace.
but sluggish operation elements dirty.
of instruments.
High system pressure. Vacuum regulator valve Clean and check operation
sticking or dirty screen. of regulator valve.

Piper Comanche PA-24 Specifications

General

Manufacturer	Piper Aircraft
Model	Comanche PA-24
Type	Light aircraft
First Flight	May 24, 1956
Number Built	4, 857
Seating Capacity	4
Engine	Lycoming O-360
Wingspan	36 ft (11 m)
Length	24 ft 8 in (7.5 m)
Stall Speed	62 mph (100 km/h, 54 kn)
Height	7 ft 6 in (2.3 m)