CAUTION
Slivers of rubber from the hoses can become detached and sucked into the
pump, causing damage and a shorter pump life.
b. Examine the ends of the hoses for rubber separation and slivers on the inside diameter. The slivers can
detach, enter the vacuum pump, filter, and cause premature pump service.
c.
Replace any hoses, clamps, or fittings that are broken, damaged, or corroded.
CAUTION
Immediately plug holes with shipping plugs after removing any component,
opening any line, ore removing any gyro instrument, or warranty will be
voided due to contamination.
10-6. VACUUM GAUGES. (Refer to Table 10-1 for Troubleshooting Instructions.)
NOTE
Vacuum gauges are replaced when malfunctions occur. The failure of the
gauge does not impair safety of flight.
a.
If the vacuum gauge malfunctions in a manner to cause an incorrect reading in normal cruise power
conditions, the gauge must be checked by comparing the reading with a gauge of known accuracy. If
the gauge is indicating correct and the system vacuum level is not in accordance with the specific
vacuum; then and only then should the regulator be adjusted.
b. Visually examine gauge performance as follows:
1. When the engine not operating and no vacuum is applied to the gauge, the pointer on the gauge
should rest against the internal stop in the 9 o’clock position. If the gauge pointer appears in any
other position, the gauge is faulty and requires replacement.
2. A slight overshoot during engine startup, not to exceed one half inch of mercury is normal and is
not cause to replace the gauge.
3. With the engine running at normal cruise power rpm, the indication on the gauge should read 4.8
to 5.2 inches of mercury.
4. At 1200 rpm, the vacuum gauge indication should read in excess of four inches of mercury.
10-7. GYRO FILTERS. (Refer to Table 10-1 for Troubleshooting Instructions.)
CAUTION
Service gyro filters per Piper recommended scheduled basis, but no later
than 100 hours, or sooner as conditions may require. Operations in dusty
conditions, or if heavy concentrations of smoking occur in the aircraft, are
conditions that warrant sooner inspection considerations.
NOTE
The vacuum system has a large central filter and a differential vacuum
gauge that monitors the filter condition while gaining vacuum indication.
Revised: 2/13/89
2F9
CHEROKEE ARROW III SERVICE MANUAL
INSTRUMENTS
Summary of Contents for ARROW III
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