3. Gyro Filters:
A. Gyro filters must be serviced on a scheduled basis, not to exceed 100 hours, or sooner as condition
indicates.
B. The system installation employs a large central filter and differential vacuum gauge that
continuously monitors the filter condition while indicating vacuum readings.
—NOTE—
The latest systems which employ a central filter in combination
with a differential vacuum gauge will indicate a decline in panel
gauge reading when the filter becomes clogged and vacuum
declines below the recommended value. The filters should be
replaced when gauge reading declines below the recommended
value; do not adjust regulator.
4. Vacuum Regulator:
A. The vacuum regulating valve seldom needs replacement. Symptoms that suggest replacement are:
(1) Chatter as indicated by rapid fluctuation of the vacuum gauge needle or an audible sound.
(2) Non-repeatability of the vacuum gauge reading when the panel gauge is not suspect or has
been checked against a known test gauge (cruise RPM only).
B. All modes of regulator malfunction tend to increase the vacuum power applied to the gyros. Thus,
although excess vacuum is applied, a loss of vacuum does not occur.
C. The gyros themselves act as a limiting device to keep the vacuum power applied from exceeding
safe levels.
—NOTE—
If the panel gauge has been checked and found OK and the
vacuum gauge reading does not repeat within the range of 4.8 to
5.2 inches of mercury, then the regulating valve should be
changed. Observe the usual precautions for maintaining system
cleanliness to avoid premature pump service.
VACUUM PUMP.
The vacuum pump is of the rotary vane, positive displacement type. This unit consists essentially of an
aluminum housing containing a tempered sleeve in which an offset rotor, with moving blades is incorporated.
This assembly is driven by means of a coupling mated to the engine driven gear assembly. The pump is
mounted on the accessory section of the engine.
37-10-02
Page 37-04
Revised: August 18, 1980
2H22
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Summary of Contents for Arrow IV
Page 18: ...CHAPTER AIRWORTHINESS LIMITATIONS 1A18...
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Page 22: ...CHAPTER TIME LIMITS MAINT CHECKS 1A22...
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Page 40: ...CHAPTER DIMENSIONS AND AREAS 1B16...
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Page 53: ...CHAPTER LIFTING AND SHORING 1C5...
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Page 57: ...CHAPTER LEVELING AND WEIGHING 1C9...
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Page 62: ...CHAPTER TOWING AND TAXIING 1C14...
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Page 66: ...CHAPTER PARKING AND MOORING 1C18...
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Page 70: ...CHAPTER REQUIRED PLACARDS 1C22...
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Page 77: ...CHAPTER SERVICING 1D5...
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Page 110: ...CHAPTER STANDARD PRACTICES AIRFRAME 1E14...
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Page 117: ...CHAPTER ENVIRONMENTAL SYSTEM 1E21...
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Page 169: ...CHAPTER AUTO FLIGHT 1H1...
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Page 176: ...CHAPTER COMMUNICATIONS 1H8...
Page 185: ...CHAPTER ELECTRICAL POWER 1H17...
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Page 233: ...CHAPTER FLIGHT CONTROLS 1J17...
Page 297: ...CHAPTER FUEL 2A18...
Page 320: ...CHAPTER HYDRAULIC POWER 2B17...
Page 355: ...CHAPTER LANDING GEAR 2D4...
Page 418: ...CHAPTER LIGHTS 2F19...
Page 430: ...CHAPTER NAVIGATION AND PITOT STATIC 2G7...
Page 444: ...CHAPTER OXYGEN SYSTEM 2G21...
Page 464: ...CHAPTER VACUUM SYSTEM 2H17...
Page 473: ...CHAPTER ELECTRICAL ELECTRONIC PANELS AND MULTI PURPOSE PARTS 2I2...
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Page 477: ...CHAPTER STRUCTURES 2I6...
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Page 496: ...CHAPTER DOORS 2J1...
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Page 505: ...CHAPTER STABILIZERS 2J10...
Page 514: ...CHAPTER WINDOWS 2J19...
Page 519: ...CHAPTER WINGS 2J24...
Page 550: ...CHAPTER PROPELLER 3A18...
Page 565: ...CHAPTER STANDARD PRACTICES ENGINE 3B9...
Page 568: ...CHAPTER POWER PLANT 3B12...
Page 592: ...CHAPTER ENGINE FUEL AND CONTROL 3C12...
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Page 611: ...CHAPTER IGNITION 3D7...
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Page 655: ...CHAPTER ENGINE INDICATING 3F16...
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Page 664: ...CHAPTER EXHAUST 3G1...
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Page 669: ...CHAPTER OIL SYSTEM 3G6...
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Page 673: ...CHAPTER STARTING 3G10...
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Page 688: ...CHAPTER TURBINES 3H1...
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Page 694: ...CHAPTER 91 CHARTS AND WIRING DIAGRAMS 3H7...
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