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塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(85)

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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GROUND SERVICE PLUG RECEPTACLE
A ground service plug receptacle may be installed to permit the use of an external power source (generator type or battery cart) for cold weather starting and during lengthy maintenance work on the airplane electrical system. The receptacle is located under a cover plate, on the lower left side of the cowling.
NOTE
If no avionics equipment is to be used or worked on, the avionics power switch should be turned off. If maintenance is required on the avionics equipment, it is advisable to utilize a battery cart external power source to prevent damage to the avionics equipment by transient voltage. Do not crank or start the engine with the avionics power switch turned on.
Just before connecting an external power source (generator type or battery cart), the avionics power switch should be turned off, and the master switch on.
The ground service plug receptacle circuit incorporates a polarity reversal protection. Power from the external power source will flow only if the ground service plug is correctly connected to the airplane. If the plug is accidentally connected backwards, no power will flow to the electrical system, thereby preventing any damage to electrical equipment.
The battery and external power circuits have been designed to completely eliminate the need to "jumper" across the battery contactor to close it for charging a completely "dead" battery. A special fused circuit in the external power system supplies the needed "jumper" across the contacts so that with a "dead" battery and an external power source applied, turning on the master switch will close the battery contactor.
LIGHTING SYSTEMS
EXTERIOR LIGHTING
Conventional navigation lights are located on the wing tips and top of
 
the rudder. A single landing light or dual landing/taxi lights are installed in the cowl nose cap, and afl ashing beacon is mounted on top of the vertical fin. Additional lighting is available and includes a strobe light on each wing tip and two courtesy lights, one under each wing, just outboard of the cabin door. The courtesy lights are operated by the dome light switch on the overhead console. All exterior lights, except the courtesy lights, are controlled by rocker type switches on the left switch and control panel. The switches are ON in the up position and OFF in the down position.
 
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