10-49. TROUBLESHOOTING.
TABLE X-VI. AIRSPEED TUBES AND INDICATOR
Trouble
Cause
Remedy
Pointers of static
Leak in instrument case
Check for leak and seal.
instruments do not
or in pitot lines.
indicate properly.
Pointer of instrument
Defective mechanism.
Replace instrument.
oscillates.
Instrument reads high.
Pointer not on zero.
Replace instrument.
Leaking static system.
Find leak and correct
Instrument reads low.
Pointer not on zero.
Replace instrument.
Leaking static system.
Find leak and correct.
Pitot head not aligned
Realign pitot head.
correctly.
Airspeed changes as
Water in pitot line.
Remove lines from static instruments and
aircraft is banked.
blowout lines from cockpit to pitot head.
—NOTE—
When any connections in static system are opened for checking.
system must be rechecked per F.A.R. 23.1325.
10-50. REMOVAL AND REPLACEMENT. Refer to Paragraph 10-87 of this section.
10-51. MAGNETIC COMPASS.
10-52. GENERAL. The magnetic compass is a self-contained instrument. This instrument has an individual
light which is connected to the instrument lighting circuit. The compass correction card is located in the card
holder mounted on the instrument. The compass should be swung whenever instruments or radios are changed
and at least once a year.
10-53 ADJUSTMENT OF COMPASS. Before attempting to compensate compass, every effort should be made
to place the aircraft in simulated flight conditions; check to see that the doors are closed, flaps in retracted
position, engine running, throttle set at cruise position and aircraft in level flight attitude. Aircraft master switch,
alternator switch and all radio switches should be in the ON position. All other cockpit controlled electrical
switches should be in the OFF position.
a. Set adjustment screws of compensator on zero. Zero position of adjusting screws is when the dot of
the screw is lined up with the dot of the frame.
b. Head aircraft on a magnetic North heading. Adjust N-S adjustment screw until compass reads exactly
North.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
I N S T R U M E N T
2C2