Revised: 2/13/89
2G3
CHEROKEE ARROW III SERVICE MANUAL
INSTRUMENTS
TABLE X-V. ALTIMETER (cont)
Trouble
Cause
Remedy
Barometric scale and
Slippage mating
Replacement instrument.
reference markers out
parts.
of synchronism.
Barometric scale and
Drift in mechanism.
Refer to latest revision
reference markers out
of AC43.13-1A.
of synchronism with
pointers.
NOTE
When any connections in the static system are opened for check, system
must be rechecked per Part 23.1325.
10-35. REMOVAL AND REPLACEMENT. (Refer to Paragraph 10-76 of this section.)
10-36. AIRSPEED INDICATOR.
10-37. GENERAL. The airspeed indicator provides a means of indicating the speed of the airplane passing
through the air. The airspeed indication is the differential pressure reading between pitot air to pressure and
static air pressure. This instrument has the diaphragm vented to the pitot air source and the case is vented to the
static air system. As the airplane increases speed, the pitot air pressure increases, causing the diaphragm to
expand. A mechanical linkage picks up this motion and moves the instrument pointer to the indicated speed.
The instrument dial is calibrated in knots and miles per hour and also has the necessary operating range
markings for safe operation of the airplane.
10-38. 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.
Summary of Contents for ARROW III
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