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. The 28VDC SHED BUSSES 210PP and 212PP are automatically shedded.
 **ON A/C 001-049, 051-060, 101-102, 201-201,
 C. Loss of the Transformer Rectifier 2 (TR2) (Ref. Fig. 003) TR2 loss leads to symmetrical recovery of DC BUS 2 from TR1; DC ESS and SHED ESS BUSSES are transferred to ESS TR through ESS TR contactor.

R **ON A/C 061-099, 103-149, 151-199, 202-299, 301-399, 401-499,
 C. Loss of the Transformer Rectifier 2 (TR2) (Ref. Fig. 003) TR2 loss leads to symmetrical recovery of DC BUS 2 from TR1; DC ESS and SHED ESS BUSSES are transferred to ESS TR through ESS TR contactor. The 28VDC SHED BUSSES 210PP and 212PP are automatically shedded.
 **ON A/C ALL
 D. Loss of the TR1 and TR2 In the event of TR1 and TR2 loss (loss of DC BUS 1 & 2), DC ESS and SHED ESS BUSSES are automatically restored from ESS TR through ESS TR contactor (3PE), from AC normal generation.

 DC Generation and Distribution - General
 Figure 001

R 1EFF : 001-049, 051-060, 101-102, 201-201, 1 24-30-00Page 3/4 1 1 May 01/05 1 1 1CES
1

 DC Generation and Distribution - General
 Figure 001A

R 1EFF : 061-099, 103-149, 151-199, 202-299, 1 24-30-00Page 5/6 1301-399, 401-499, 1Aug 01/05 1 1 1CES

 Loss of Transformer Rectifier 1 - Block Diagram
 Figure 002

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 Loss of Transformer Rectifier 2 - Block Diagram
 Figure 003

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 2. Component Location
__________________ R (Ref. Fig. 004, 005)
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------1PB1 BCL-1 124 822 24-38-34 1PB2 BCL-2 124 822 24-38-34 2PB1 BAT-1 126 822 24-38-51 2PB2 BAT-2 126 822 24-38-51 4PB1 HOLDER-BAT 1 FUSE 120VU 212 831 24-38-00 4PB2 HOLDER-BAT 2 FUSE 120VU 212 831 24-38-00 6PB1 CNTOR-LINE, BAT 1 105VU 126 822 24-38-55 6PB2 CNTOR-LINE, BAT 2 105VU 126 822 24-38-55 7PB1 P/BSW-ELEC/BAT 1 35VU 210 831 24-38-00 7PB2 P/BSW-ELEC/BAT 2 35VU 210 831 24-38-00 1PC1 CNTOR-DC NORM BUS 1 SWITCHING 120VU 212 831 24-35-55 1PC2 CNTOR-DC NORM BUS 2 SWITCHING 120VU 212 831 24-35-55 4PC CNTOR-DC ESS BUS SUPPLY 106VU 125 812 24-35-55 20PC HOLDER-FUSE 120VU 212 831 24-35-00 1PE TR-ESS 125 812 24-34-51 3PE CNTOR-ESS TR 106VU 125 812 24-34-55 1PU1 TR-1 126 822 24-32-51 1PU2 TR-2 126 822 24-32-51 5PU1 CNTOR-TR 1 120VU 212 831 24-32-55 5PU2 CNTOR-TR 2 120VU 212 831 24-32-55 14PU CNTOR-TR 2/AC SVCE BUS NORM SPLY 120VU 212 831 24-32-55 15PU P/BSW-TR RST 103VU 126 822 24-32-00 3PV1 VOLTMETER-BAT 1 35VU 210 831 24-37-21 3PV2 VOLTMETER-BAT 2 35VU 210 831 24-37-21
 -------------------------------------------------------------------------------FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA I I I I DOOR I REF.
 -------------------------------------------------------------------------------4PB11 FUSE-BAT1 120VU 212 24-38-00 4PB21 FUSE-BAT2 120VU 212 24-38-00
 20PC1 FUSE 120VU 212 24-35-00

 DC Generation - Component Location Figure 004
 1EFF : 1 1R 1CES  ALL  1 11 1 24-30-00 Page 12 Feb 01/99

 Spare Fuses - Component Location
 Figure 005
 1EFF :  ALL  1  24-30-00 Page 13 
1  1  Feb 01/99
 1  1
 1CES  1

 A. Spare Fuses
 (1)
 If fuses 4PB11 and 4PB21 blow, you can replace them by spare 350 A fuses located on the panel 120VU.

 (2)
 If fuse 20PC1 blows, you can replace it by a spare 80 A fuse located on the panel 120VU or by a spare 80 A fuse located on the left side panel, in the cockpit.

 3. BITE Test
_________

 (Ref. Fig. 006)
 The BITE and maintenance test of both BCL as well as maintenance test of the
　
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