CHART 3404. TROUBLESHOOTING (GYRO HORIZON INDICATOR) (cont)
Trouble
Cause
Remedy
Bar oscillates or shimmies
Instrument loose in panel.
Tighten mounting screws.
continuously.
Vacuum too high.
Adjust valve.
Defective mechanism.
Replace instrument.
Instrument does not indi-
Instrument not level in
Loosen screws and level
cate level flight.
panel.
instrument.
Aircraft out of trim.
Trim aircraft.
Bar high after 180°
Normal, if it does not
turn.
exceed 1/16 inch.
Instrument tumbles in
Low vacuum.
Reset regulator.
flight.
Dirty filter.
Clean or replace filter.
Line to filter restricted.
Replace line.
Plug missing or loose in
Replace or tighten plug.
instrument.
DIRECTIONAL GYRO.
The directional gyro is a flight instrument incorporating an air driven gyro stabilized in the vertical plane.
The gyro is rotated at high speed by lowering the pressure in the air tight case and simultaneously allowing
atmospheric air pressure to enter the instrument against the gyro buckets. Due to gyroscopic inertia, the spin
axis continues to point in the same direction even though the aircraft yaws to the right or left. This relative
motion between the gyro and the instrument case is shown on the instrument dial which is similar to a compass
card. The dial, when set to agree with the airplane magnetic compass, provides a positive indication free from
swing and turning error. However, the directional gyro has no sense of direction and must be set to the
magnetic compass, since the magnetic compass is subject to errors due to magnetic fields, electric instruments,
etc. The directional gyro is only accurate for the heading it has been set for. If the gyro is set on 270°, for
instance, and the aircraft is turned to some other heading, there can be a large error between the gyro and the
magnetic compass due to the error in compass compensation. This will appear as gyro precession. The gyro
should only be checked to the heading on which it was first set. Due to internal friction, spin axis error, air
turbulence and airflow, the gyro should be set at least every 15 minutes for accurate operation, whether it has
drifted or not.
34-10-05
Page 34-09
December 1, 1978
2G17
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Содержание Arrow IV
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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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