Gyro Horizon; Rate Of Climb Indicator - Piper ARROW III Service Manual

Trouble
Instrument tumbles in
flight.
Instrument does not
indicate level flight.
Bar high after 180°
turn.
10-23. REMOVAL AND REPLACEMENT. (Refer to Paragraphs 10-74 and 10-78 of this section.)

10-24. GYRO HORIZON.

10-25. GENERAL. 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.
10-26. TROUBLESHOOTING.
10-27. REMOVAL AND REPLACEMENT. (Refer to Paragraphs 10-74 and 10-78 of this section.)

10-28. RATE OF CLIMB INDICATOR.

10-29. GENERAL. The rate of climb indicator measures the rate of change in static pressure when the airplane
is climbing or descending. By means of a pointer and dial, this instrument will indicate the rate of ascent or
descent of the airplane in feet per minute. But due to the lag of the instrument, the aircraft will be climbing or
descending before the instrument starts to read and the instrument will continue to read after the aircraft has
assumed level flight. In rough air, this should not be considered a malfunction.
Revised: 2/13/89
CHEROKEE ARROW III SERVICE MANUAL
TABLE X-III. GYRO HORIZON INDICATOR (cont)
Low vacuum.
Dirty filter.
Line to filter restricted.
Plug missing or loose
in instrument
Instrument not level
in panel.
Aircraft out of trim.
Normal, if it does not
exceed 1/16 inch.
2F23
Cause
Reset regulator.
Clean or replace filter.
Replace line.
Replace or tighten plug.
Loosen screws and level
instrument.
Trim aircraft.
Remedy
INSTRUMENTS