CHART 3403. TROUBLESHOOTING (AIRSPEED TUBES AND INDICATOR) (cont)
Trouble Cause Remedy
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 aircraft Water in pitot line. Remove lines from static in-
is banked. struments and blow out lines
from cockpit to pitot head.
—NOTE—
When any connections in the static system are opened for
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 by 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)
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. Check part number.
Defective instrument. Replace.
34-10-04
Page 34-08
December 1, 1978
2G16
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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