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1 - Ground power receptacle
2 - Ground power receptacle relay
3 - Battery relay
4 - Starter relay
External power - Identification and location of components
Figure 1
AEAC
Validity : Standard Post-MOD. 151 24-40-00Page 2
(EA) OCT 02
DISTRIBUTION
DESCRIPTION AND OPERATION
1. GENERAL
The distribution is the part of the system which connects the DC current source to the utilization circuits. This sub-system consists of the following main elements :
- fuses of PL3 fuse panel,
- bus bars,
- "pull-off" type circuit-breakers of PL1 circuit-breaker panel,
- circuit-breakers of PL1 circuit-breaker panel,
- switch-breakers of PL2 central pedestal.
2. LOCATION (Figure 1)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Fuses / 200 211L
212L 24-50-00
Bus bars 3 (Std)
1 (Opt.) 200 232L 24-50-00
"Pull-off" type circuit-breakers / 200 232L 24-50-00
Circuit-breakers / 200 232L 24-50-00
Switch-breakers / 200 252 24-50-00
3. DESCRIPTION (Figures 2 and 3)
A. Fuses
Fuses inserted in the PL3 panel located on firewall door 212L protect the systems which are not protected by circuit-breakers.
NOTE : The diagram located on PL3 fuse panel allows localization of fuses. Spare fuses are located on the cover fixed on door 212L.
B. Bus bars
Bus bars are elements which dispatch DC to the various circuits. They are located behind the PL1 circuit-breaker panel.
C. "Pull-off" type circuit-breakers
In addition to protection of the alternator supply with a 60-amp "pull-off" type circuit-breaker labeled "ALT", the following "pull-off" type circuit-breakers have been installed :
- 70 A labeled "BAT" between battery and network,
- 40 A labeled "BUS 1" on bus bar 1 supply,
ACM
Validity : S / N 1 - 822, 850 - 887, 889 - 947 24-50-00(DA) 1
(DA) OCT 02
- 40 A labeled "BUS 2" on bus bar 2 supply,
- 40 A labeled "BUS 3" on bus bar 3 supply.
These five "pull-off" type circuit-breakers are manually-operated and can selectively isolate the various sources or bus bars.
NOTE : "MAIN SWITCH" and "ALT" disconnection in flight simultaneously disconnects all electrical power supplies.
D. Circuit-breakers
Most of aircraft electrical circuits are protected by circuit-breakers installed on PL1 panel located on the L.H. side of the pilot. Should an overload occur in a circuit, the circuit-breaker trips and will switch off the circuit. Allow it to cool for approximately three minutes, then the circuit-breaker may be reengaged (pressed down).
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本文链接地址：TB20 MAINTENANCE MANUAL 24 COMMUNICATIONS TB20飞机维护手册 电源(41)
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