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DISTRIBUTION .
VACUUM SYSTEM SERVICE TIPS.
The following information is intended to acquaint field service personnel with a means to diagnose
vacuum system service symptoms on those components which are serviced by removal and replacement.
These items include hoses, clamps, gyro filters, vacuum regulating valves and vacuum gauges.
1. Hoses and Clamps:
A. These items should be examined periodically and inspected carefully whenever engine
maintenance activities cause hose disconnections to be made at the pump, regulating valve, gyros
and/or vacuum gauge.
B. The ends of the hoses should be examined for rubber separation and slivers of rubber on the inside
diameter of the hoses. These slivers can and do become detached. If this happens, the vacuum
pump suck these loose particles and eventually ingest them. This can cause premature pump
service.
C. Hose clamps and fittings should be replaced when broken, damaged or corroded.
—CAUTION—
When replacing any of the threaded fittings, DO NOT USE PIPE
DOPE or any other anti-seize tape or compound. The
AIRBORNE fittings are all cadmium plated to avoid the need for
any other anti-seize materials. The reason for this caution is to
protect the pump from ingesting any foreign materials that could
cause premature service.
2. Vacuum Gauges:
A. Vacuum gauges seldom require service and usually are replaced when malfunctions occur.
—NOTE—
Vacuum gauge failure in a properly operating vacuum system
does not impair safety of flight.
B. If the vacuum gauge malfunctions in a manner to cause an incorrect reading in normal cruise
conditions, the gauge must be checked by comparing the reading with a gauge of known accuracy.
If the gauge is indicating correct values and the system vacuum level is not in accordance with the
specified vacuum, then and only then should the regulator be reset.
C. Visual examination of the gauge performance should cover the following steps:
(1) With engine stopped and no vacuum applied to the gauge, its pointer should rest against the
internal stop in the 9 o’clock position. Any other displacement from this position suggests
need for replacement.
(2) A slight overshoot during engine startup, not to exceed half an inch (1/2”) of mercury, is
normal and is not cause to replace gauge.
(3) With engine operating at normal cruise RPM, the gauge should read from 4.9 inches to 5.1
inches of mercury (vacuum).
(4) At 1200 RPM, the vacuum gauge reading should be more than four inches of mercury.
37-10-01
Page 37-03
December 1, 1978
2H21
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Содержание Arrow IV
Страница 18: ...CHAPTER AIRWORTHINESS LIMITATIONS 1A18...
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Страница 22: ...CHAPTER TIME LIMITS MAINT CHECKS 1A22...
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Страница 40: ...CHAPTER DIMENSIONS AND AREAS 1B16...
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Страница 53: ...CHAPTER LIFTING AND SHORING 1C5...
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Страница 57: ...CHAPTER LEVELING AND WEIGHING 1C9...
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Страница 62: ...CHAPTER TOWING AND TAXIING 1C14...
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Страница 66: ...CHAPTER PARKING AND MOORING 1C18...
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Страница 70: ...CHAPTER REQUIRED PLACARDS 1C22...
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Страница 77: ...CHAPTER SERVICING 1D5...
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Страница 110: ...CHAPTER STANDARD PRACTICES AIRFRAME 1E14...
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Страница 117: ...CHAPTER ENVIRONMENTAL SYSTEM 1E21...
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Страница 169: ...CHAPTER AUTO FLIGHT 1H1...
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Страница 176: ...CHAPTER COMMUNICATIONS 1H8...
Страница 185: ...CHAPTER ELECTRICAL POWER 1H17...
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Страница 233: ...CHAPTER FLIGHT CONTROLS 1J17...
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Страница 297: ...CHAPTER FUEL 2A18...
Страница 320: ...CHAPTER HYDRAULIC POWER 2B17...
Страница 355: ...CHAPTER LANDING GEAR 2D4...
Страница 418: ...CHAPTER LIGHTS 2F19...
Страница 430: ...CHAPTER NAVIGATION AND PITOT STATIC 2G7...
Страница 444: ...CHAPTER OXYGEN SYSTEM 2G21...
Страница 464: ...CHAPTER VACUUM SYSTEM 2H17...
Страница 473: ...CHAPTER ELECTRICAL ELECTRONIC PANELS AND MULTI PURPOSE PARTS 2I2...
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Страница 477: ...CHAPTER STRUCTURES 2I6...
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Страница 496: ...CHAPTER DOORS 2J1...
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Страница 505: ...CHAPTER STABILIZERS 2J10...
Страница 514: ...CHAPTER WINDOWS 2J19...
Страница 519: ...CHAPTER WINGS 2J24...
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Страница 550: ...CHAPTER PROPELLER 3A18...
Страница 565: ...CHAPTER STANDARD PRACTICES ENGINE 3B9...
Страница 568: ...CHAPTER POWER PLANT 3B12...
Страница 592: ...CHAPTER ENGINE FUEL AND CONTROL 3C12...
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Страница 611: ...CHAPTER IGNITION 3D7...
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Страница 655: ...CHAPTER ENGINE INDICATING 3F16...
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Страница 664: ...CHAPTER EXHAUST 3G1...
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Страница 669: ...CHAPTER OIL SYSTEM 3G6...
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Страница 673: ...CHAPTER STARTING 3G10...
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Страница 688: ...CHAPTER TURBINES 3H1...
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Страница 694: ...CHAPTER 91 CHARTS AND WIRING DIAGRAMS 3H7...
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Страница 739: ...CHAPTER 95 SPECIAL PURPOSE EQUIPMENT 3K1...
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