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塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(84)

时间:2011-12-29 11:03来源:蓝天飞行翻译 作者:航空 点击:

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OVER-VOLTAGE SENSOR AND WARNING LIGHT
The airplane is equipped with an automatic over-voltage protection system consisting of an over-voltage sensor behind the instrument panel and a red warning light, labeled HIGH VOLTAGE, adjacent to the amme¬ter.
In the event an over-voltage condition occurs, the over-voltage sensor automatically removes alternator field current and shuts down the alter¬nator. The red warning light will then turn on, indicating to the pilot that the alternator is not operating and the battery is supplying all electrical power.
The over-voltage sensor may be reset by turning off the avionics power switch and then turning the master switch off and back on again. If the warning light does not illuminate, normal alternator charging has resumed; however, if the light does illuminate again, a malfunction has occurred, and the flight should be terminated as soon as practical. In either case, the avionics power switch may be turned on again if required.
The warning light may be tested by momentarily turning off the ALT portion of the master switch and leaving the BAT portion turned on.
CIRCUIT BREAKERS AND FUSES
Most of the electrical circuits in the airplane are protected by "push-to¬reset" circuit breakers mounted on the lower left side of the instrument panel. In addition to the individual circuit breakers, a toggle-type circuit breaker-switch, labeled AVIONICS POWER, on the left switch and control panel also protects the avionics systems. The cigar lighter is protected by a manually-reset type circuit breaker on the back of the lighter, and a fuse behind the instrument panel. The control wheel map light (if installed) is protected by the NAV LT circuit breaker and a fuse behind the instrument panel. Electrical circuits which are not protected by circuit breakers are the battery contactor closing (external power) circuit, clock circuit, and
 
flight hour recorder circuit. These circuits are protected by fuses mounted adjacent to the battery.
 
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