ADIRS - Power Supply Distribution
 Figure 002

R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-11-00Page 6 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1 B. ADIRS Power Supply Distribution in Normal Configuration

 (1) Captain side The ADIRU 1 is supplied with 115VAC by the 115VAC SHED ESS BUS 801XP-A. The back-up 28VDC is provided by the 28VDC HOT BUS 701PP. The resolvers of the AOA sensor 1 and the AOA resolver converter module of the ADIRU 1 are supplied with 26VAC by the 26VAC ESS BUS 431XP-A. The sensors and probes (static, TAT, pitot, AOA) are supplied for heating through the Probe Heat Computer 1:
 -
the heating element of the AOA sensor 1 receives 115VAC from the 115VAC SHED ESS BUS 801XP

 -
the heating element of the TAT sensor 1 receives 115VAC from the 115VAC BUS 1 101XP-A

 -
the heating element of the L and R static probes 1 receives 28VDC from the 28VDC BUS 1 101PP

 -
the heating element of the pitot probe 1 receives 115VAC from the

 115VAC ESS BUS 401XP.
 (Ref. Fig. 003)

 NOTE : Figure ADIRS/PHC Interface, is a principle diagram which does
____ not show the interface between the PHC and the sensors. (Ref. 30-31-00 for more details on probe ice protection).
 (2)
 First Officer side The ADIRU 2 is supplied with 115VAC by the 115VAC BUS 2 204XP. The back-up 28VDC is provided by the 28VDC HOT BUS 702PP. The resolvers of the AOA sensor 2 and the AOA resolver converter module of the ADIRU 2 are supplied with 26VAC by the 26VAC BUS 2 231XP-A. The sensors and probes are supplied for heating through the PHC 2:

 -
the heating element of the AOA sensor 2 receives 115VAC from the 115VAC BUS 2 202XP-B

 -
the heating element of the TAT sensor 2 receives 115VAC from the 115VAC BUS 2 202XP-C

 -
the heating element of the L and R static probes 2 receives 28VDC from the 28VDC BUS 2 206PP

 -
the heating element of the pitot probe 2 receives 115VAC from the 115VAC BUS 2 202XP-B.

 (3)
 Standby side The ADIRU 3 is supplied with 115VAC by the 115VAC BUS 1 101XP-C. The back-up 28VDC is provided by the 28VDC HOT BUS 701PP. The resolvers of the AOA sensor 3 and the AOA resolver converter module of the ADIRU 3 are supplied with 26VAC by the 26VAC BUS 1 131XP-A. The sensors and probes are supplied for heating through the PHC 3:

 -the heating element of the AOA sensor 3 receives 115VAC from the 115VAC BUS 1 103XP
R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-11-00Page 7 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1

 ADIRS/PHC Interface
 Figure 003

R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-11-00Page 8 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1

 -
the heating element of the L and R static probes 3 receives 28VDC from the 28VDC BUS 1 103PP

 -
the heating element of the pitot probe 3 receives 115VAC from the

 115VAC BUS 1 103XP. In normal configuration of the aircraft electrical generation, the distribution described before is independent of the switching selector switches.
 C. ADIRS Power Supply Distribution after Loss of Main Electrical Generation
 (1)
 Loss of the main generation and ATT HDG selector switch in NORM position

 (a)
 Captain side The ADIRU 1 is supplied as in normal configuration. (Ref.Para B.(1)).

 (b)
 First Officer side The ADIRU 2 is no more supplied with 115VAC and 26VAC. When the 26VAC is lost, the ADR detects a fault and flags the output parameters. The ADIRU is still powered with 28VDC from the 28VDC HOT BUS 702PP but the Time Delay Opening (TDO) relay 17FP will cut this supply after 5 minutes in emergency configuration. The ADR 2 function is lost immediately. The IR 2 function is lost after 5 minutes.

 (c)
 Standby side The ADIRU 3 is no more supplied with 115VAC and 26VAC. When the 26VAC is lost, the ADR detects a fault and flags the output parameters. The ADIRU is still powered with 28VDC from the 28VDC HOT BUS 701PP but the Time Delay Opening (TDO) relay 14FP will cut this supply after 5 minutes in emergency configuration. The ADR3 function is lost immediately. The IR 3 function is lost after 5 minutes.

 (2)
 Loss of the main generation and ATT HDG selector switch in CAPT/3 position The CAPT/3 position of the ATT HDG selector switch corresponds to the selection of the IR 3 in place of the IR 1. The power supply distribution must then be modified to keep the IR 3 in emergency configuration.

 (a) Captain side
 The ADIRU 1 is supplied as in normal configuration
 (Ref. Para. B.(1)).
　
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