- or by the emergency generator in emergency configuration or smoke emergency configuration, - or by the static inverter in emergency configuration during RAT extension
 and when the landing gear is extended. The major part of this network is supplied with three-phase 115 VAC/400 Hz. A 115/26 VAC single-phase autotransformer, identical to those of the main distribution supplies an essential 26 VAC/400 Hz sub-busbar (431XP-A). In case of loss of supply of 115 VAC ESS bus and 115 VAC SHED bus, a warning is tiggered on the ECAM (Ref. Fig. 004, 005, 006)
 NOTE : Part of this network (115 VAC SHED BUS 8XP) is automatically shed in
____ emergency configuration when the static inverter is operating.

R **ON A/C 106-149, 151-199, 204-299, 301-399, 401-499,
 The AC essential distribution network can be supplied:
 -either by 115 VAC BUS1 1XP,
 - or by 115 VAC BUS2 2XP in case of loss of power from main busbar 1XP (in this case, the crew has to select ALTN on AC ESS FEED pushbutton switch to recover 115 VAC ESS BUS),
 - or by the emergency generator in emergency configuration or smoke emergency configuration, - or by the static inverter in emergency configuration during RAT extension
 and when the CSM/G is switched off after landing. The major part of this network is supplied with three-phase 115 VAC/400 Hz. A 115/26 VAC single-phase autotransformer, identical to those of the main distribution supplies an essential 26 VAC/400 Hz sub-busbar (431XP-A). In case of loss of supply of 115 VAC ESS bus and 115 VAC SHED bus, a warning is triggered on the ECAM (Ref. Fig. 004, 005, 006)
 NOTE : Part of this network (115 VAC SHED bus 8XP) is automatically shed in
____ emergency configuration when the static inverter is operating.
R 1EFF : ALL 1 24-52-00Page 2 1 1 Aug 01/05 1 1 1CES 1

 AC Essential Distribution - Block Diagram
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-52-00Page 3/4 1201-299, 301-399, 1Aug 01/05 1 1 1CES R AC Essential Distribution - Block Diagram R Figure 001A

R 1EFF : 401-499, 1 24-52-00Page 5/6 1 1 Aug 01/05 1 1 1CES

 AC Essential Distribution - Component Location Figure 002
 1EFF : 1 1R 1CES  ALL  1 11 1 24-52-00 Page 7 Aug 01/05

 AC Essential Distribution - Component Location Figure 003
 1EFF : 1 1R 1CES  ALL  1 11 1 24-52-00 Page 8 Aug 01/05

 AC Essential Distribution - ECAM Warnings Figure 004
 1EFF : 1 1R 1CES  ALL  1 11 1 24-52-00 Page 9 Aug 01/05

 115 VAC SHED BUS - Upper and Lower ECAM Display Unit Figure 005 (SHEET 1)
 1EFF : ALL 1 24-52-00Page 10 1 1 Aug 01/05R 1 1 1CES 1

 115 VAC SHED BUS - Upper and Lower ECAM Display Unit Figure 005 (SHEET 2)
 1EFF : ALL 1 24-52-00Page 11 1 1 Aug 01/05 1 1 1CES 1

 Loss of the 115 VAC ESS BUS (Class 1 - Level 2)
 Figure 006
 1EFF :  ALL  1  24-52-00 Page 12 
1  1  Aug 01/05
 1  1
 1CES  1

 TRANSFORMER - 115/26VAC (5XH) - REMOVAL/INSTALLATION
____________________________________________________ TASK 24-52-51-000-001 Removal of the Essential 115/26VAC Autotransformer (5XH)
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
 No specific circuit breaker(s) safety clip(s)
 No specific access platform 1.8 m (5 ft. 11 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001  Energize the Ground Service Network from the External Power 24-52-51-991-001 Fig. 401
 3. Job Set-up
__________ Subtask 24-52-51-861-051
 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 Subtask 24-52-51-010-050
 B. Get access to the Avionics Compartment
 (1)
 Put the access platform at the access door 812 to get access to the avionics compartment.

 (2)
 Open the access door 812.

 (3) Open the access panel of the AC/DC emergency power center 106VU. Subtask 24-52-51-865-050
 C. Open, safety and tag this(these) circuit breaker(s):
　
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