Operational Check of ISIS DC HOT Bus SUPPLY

TASK 34-22-25-710-001-A
Operational Check of ISIS DC HOT Bus SUPPLY

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 342000-03
OPERATIONAL CHECK OF ISIS DC HOT BUS SUPPLY
Test of the correct power supply of ISIS DC HOT BUS in emergency configuration when the batteries are the only power supply source.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)

3. Job Set-up
Subtask 34-22-25-861-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 34-22-25-860-063-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) On the SWITCHING panel 8VU, make sure that the AIR DATA selector switch is at NORM.

Subtask 34-22-25-865-063-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/STBY/INST	5FN	F12
105VU	NAV/STBY/INST/BAT	23FN	J01

Subtask 34-22-25-860-064-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) On panel 35VU, make sure that the ELEC/ BAT1 and ELEC/BAT2 pushbutton switches are released.

The OFF legends is on.

4. Procedure
Subtask 34-22-25-740-052-A ** ON A/C NOT FOR ALL

A. Operational Test of ISIS DC HOT BUS SUPPLY

ACTION	RESULT
1.Open circuit breaker 5FN.	On panel 401VU: Make sure that the display of the ISIS indicator (22FN) is off.
2.On overhead panel: On the panel 21VU, push and hold the EMER GEN TEST pushbutton switch (23XE) Simultaneously, on the panel 35VU, release the ELEC/EXT PWR pushbutton switch (10XG).	After approximatly 12 seconds, make sure that the display of the ISIS indicator (22FN) is on. The INIT 90s (initialization display) indication comes into view.
3.On the overhead panel: On the panel 21VU, release the EMER GEN TEST pushbutton switch (23XE) On the panel 35VU, push the ELEC/EXT PWR pushbutton switch (10XG)
4.Close circuit breaker 5FN.	After approximatly 12 seconds, make sure that the display of the ISIS indicator (22FN) is on. The INIT 90s (initialization display) indication comes into view.

5. Close-up
Subtask 34-22-25-860-065-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.

Subtask 34-22-25-862-051-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 08:25:58 UTC