Piper SARATOGA PA-32-301 Maintenance Manual page 366

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 3403. TROUBLESHOOTING (AIRSPEED TUBES AND INDICATOR) (cont)
Trouble
Cause
Remedy
Instrument reads low.
Pointer not on zero.
Replace instrument.
Leaking static system.
Pitot head not aligned
correctly.
Find leak and correct.
Realign pitot head.
Airspeed changes as aircraft
is banked.
Water in pitot line.
Remove lines from static in-
struments and blow out lines
from cockpit to pitot head.
- NOTE-
When any connections in static system are openedfor checking,
system must be checked per F.A.R. 23.1325.
GYRO HORIZON.
The gyro horizon is essentially an air driven gyroscope rotating in a horizontal plane and is operated b\
the same principal as the directional gyro. Due to the gyroscopic inertia, the spin axis continues to point in the
vertical direction. providing a constant visual reference to the attitude of the airplane relative to pitch and roll
axis. A bar across the face of the indicator represents the horizon and aligning the miniature airplane to the
horizon bar simulates the alignment of the airplane to the actual horizon. Any deviation simulates the
deviation of the airplane from the true horizon. The gyro horizon is marked for different degrees of bank.
CHART 3404. TROUBLESHOOTING (GYRO HORIZON INDICATOR)
I
Trouble
Cause
Remedy
Bar fails to respond. Insufficient vacuum.
Check pump and tubing.
Filter dirty.
Clean or replace filter.
Bar does not settle.
Insufficient vacuum.
Check line and pump.
Adjust valve.
Incorrect instrument.
Defective instrument.
Check part number.
Replace.
34-10-04
Page 34-07
Issued: January 2. 1980
2E1