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TB20 MAINTENANCE MANUAL 24 COMMUNICATIONS TB20飞机维护手册 电源(39)

时间:2011-10-31 12:26来源:蓝天飞行翻译 作者:航空
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EXTERNAL POWER
DESCRIPTION AND OPERATION
1. GENERAL
The external power is the part of the system within the aircraft which links external electrical power to aircraft electrical system.
This sub-system consists of the following elements :
- ground power receptacle,
- ground power receptacle relay.
2. LOCATION (Figures 1, 1A and 1B)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Ground power receptacle 1 210 216 24-40-00
Ground power receptacle relay 1 200 218 24-40-00

3. DESCRIPTION
A. Ground power receptacle
For startings by cold weather and for long time maintenance practices on the electrical and avionics equipment, the ground power receptacle permits the use of an external power supply source. The receptacle is located under the baggage compartment access door, near the anti-spin edge.
NOTE : If no avionics equipment is to be used or worked on, turn off the avionics power switches or open the circuit-breakers. If maintenance practices are required, use better a ground power source energized through a battery holder cart to prevent damage to the avionics equipment by transient voltage.
B. Ground power receptacle relay
Located on frame C4 lower part at the level of starter and battery relays, the ground power receptacle relay ensures continuity between the external energy source, the battery and the various utilization circuits.
S / N 1 - 822, 850 - 887, 889 - 947
When the ground power receptacle is supplied, the battery and ground power supply are connected in parallel.
NOTE : Use of the ground power receptacle for starting the engine with a run-down battery or charging a run-down battery on board is not recommended. Remove the battery from the aircraft and charge it. The non-observance of these precautionary measures could result in loss of electrical power during flight.
S / N 823 - 849, 888, 948 - 9999
The ground power receptacle relay automatically disconnects the battery when the ground power receptacle is supplied. Therefore the battery cannot be charged without removing it from the aircraft.
ABAA
Validity : Option Pre-MOD. 151 24-40-00Page 1
(DA) OCT 02
 
4. OPERATION
Starting the engine with an auxiliary power source does not modify basic procedures - refer to Pilot's Operating Handbook, however :
Aircraft not equipped with "Radio Master" !Dillon  Avionics equipment switches shall be turned off. Aircraft equipped with "Radio Master" option
Electrical power supply to radio COM and radio NAV systems is automatically interrupted during the engine start-up phase.
All
The ground power receptacle system consists of a protection device against polarity switching. The aircraft shall be energized by the ground power source only if the ground power receptacle is correctly connected ; if not, the mains shall not be energized, thereby preventing any damage of electrical equipment.
 
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