-BAT 1, BAT 2,
 -GEN 1, GEN 2,
 -EXT A.

 (2)
 In the cockpit, make sure that the warning notice is in position to tell persons not to operate the pushbutton switches on these overhead panels:

 -35VU (ELEC),
 -21VU (EMER ELEC PWR).

 (3)
 Make sure that the external power connector is not connected to the aircraft receptable EXT PWR A.

 (4)
 On the access door 121AL, make sure that the warning notice is in position to tell persons not to connect the external power connector.

 (5)
 Make sure that the access platform is in position at the access door

 822.

 (6)
 Make sure that access door 822 is open.

 (7)
 In the avionics compartment, make sure that the access door from the panel 105VU is open.

 (8)
 Make sure that the batteries are disconnected.

 Subtask 24-28-55-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------105VU ELEC/HOT BUS/702PP SPLY 5PB2 D02 105VU ELEC/HOT BUS/701PP SPLY 5PB1 D01 105VU ELEC/STAT INV/CNTOR/CTL 14XB G02 106VU CSM/G /EV/MAN/SPLY 6XE B04 122VU ELEC/REFLNG/ON/BAT 1PR U28
 1EFF : ALL 1 24-28-55Page 406 1 1 May 01/05R 1 1 1CES 1

 4. Procedure
_________
 (Ref. Fig. 401/TASK 24-28-55-991-001) Subtask 24-28-55-420-050
 A. Installation of the contactor
 (1)
 Install the contactor (1) on the 6 tapped barrels (6) of the contactor base (7).

 (2)
 TORQUE the six captive screws (4) to between 23.9 and 26.55 lbf.in

 (0.27 and 0.30 m.daN).

 (3)
 Remove the blanking caps from the electrical connectors.

 (4)
 Make sure that the electrical connectors are clean and in the correct condition.

 (5)
 Connect the electrical connector (3).

 (6)
 Connect the batteries:

 (a) Put the connectors on the batteries.
 (b) Tighten the knurled nuts by one quarter of a turn. Subtask 24-28-55-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 14XB, 5PB1, 5PB2, 6XE, 1PR.
 Subtask 24-28-55-710-050
 C. Do an operational test of the static inverter (Ref. TASK 24-28-00-710-001).

 5. Close-up
________ Subtask 24-28-55-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the access door of panel 105VU.

 (3)
 Close the access door 822.

 (4)
 Remove the access platform(s).

 (5)
 Remove the warning notice(s).

 DC GENERATION - DESCRIPTION AND OPERATION
_________________________________________
 1. General
_______
 The aircraft DC power generation is provided by three Transformers Rectifiers (TR).
 **ON A/C 001-049, 051-060, 101-102, 201-201,
 A. In Normal Configuration (Ref. Fig. 001) In normal configuration, direct current is provided by both normal transformers rectifiers (TR1 and TR2) and possibly by batteries. TR1 supplies, through TR1 contactor (5PU1) normal bus 1 (DC BUS1), battery bus (DC BAT BUS), essential bus (DC ESS BUS) and sheddable essential bus (DC SHED ESS BUS). The BAT BUS is supplied from BUS 1, through DC NORM BUS 1 SWITCHING contactor (1PC1), and provides power to ESS BUS and SHED ESS BUS through respectively DC ESS BUS SUPPLY contactor (4PC) and DC SHED ESS BUS contactor (8PH) in succession. Both batteries and their respective HOT BUS are connected or not to BAT BUS, in parallel, through both BATTERY LINE contactors (6PB1 & 6PB2). TR2 supplies, through TR2 contactor (5PU2), normal bus 2 (DC BUS 2).
 B. Loss of the Transformer Rectifier 1 (TR1) (Ref. Fig. 002) In the event of TR1 loss, DC BUS 1 and DC BAT BUS are automatically restored from TR2 through DC NORM BUS 2 SWITCHING contactor (1PC2) and DC NORM BUS 1 SWITCHING contactor (1PC1). DC ESS and SHED ESS BUSSES are automatically transferred to ESS TR through ESS TR contactor (3PE). ESS TR supply is provided from AC BUS 1 through AC ESS BUS SWITCHING contactor (3XC) and AC ESS BUS contactor (15XE) in succession.

R **ON A/C 061-099, 103-149, 151-199, 202-299, 301-399, 401-499,
 A. In Normal Configuration (Ref. Fig. 001A) In normal configuration, direct current is provided by both normal transformers rectifiers (TR1 and TR2) and possibly by batteries. TR1 supplies, through TR1 contactor (5PU1) normal bus 1 (DC BUS1), battery bus (DC BAT BUS), essential bus (DC ESS BUS) and sheddable essential bus (DC SHED ESS BUS). The BAT BUS is supplied from BUS 1, through DC NORM BUS 1 SWITCHING contactor (1PC1), and provides power to ESS BUS and SHED ESS BUS through
　
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