BITE Check of the Emergency Power Supply Units (EPSU)

TASK 33-51-00-740-801-A
BITE Check of the Emergency Power Supply Units (EPSU)

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 23-73-00-861-001-A	Energize the Cabin Intercommunication Data System (CIDS)
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)
TASK 31-32-00-860-003-A	Procedure to Get Access to the SYSTEM REPORT/TEST/COM Page

3. Job Set-up
Subtask 33-51-00-860-088-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).
(2) Get access to the SYSTEM/REPORT/TEST COM Page (Ref. AMM TASK 31-32-00-860-003).
(3) Make sure that the Cabin Intercommunication Data System (CIDS) is energized (Ref. AMM TASK 23-73-00-861-001).
(4) In the cabin, on Forward Attendant Panel (FAP) 120RH, make sure that the EMER pushbutton switch is released (the position out/indicator light is off).
(5) In the cockpit, on overhead panel 25VU, make sure that:

Switch 4WL EMER EXIT LT is in the OFF position
Switch 190RH NO SMOKING is in the OFF position
Indicator 5WL EMER EXIT LT OFF is ON.

Subtask 33-51-00-860-088-D ** ON A/C NOT FOR ALL

Switch 4WL EMER EXIT LT is in the OFF position
Switch 190RH NO SMOKING is in the OFF position
Indicator 5WL EMER EXIT LT OFF is ON.

Subtask 33-51-00-860-088-F ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the procedure to get access to the SYSTEM/REPORT/TEST COM Page (Ref. AMM TASK 31-32-00-860-003).
(3) Make sure that the Cabin Intercommunication Data System (CIDS) is energized (Ref. AMM TASK 23-73-00-861-001).
(4) In the cabin, on Flight Attendant Panel (FAP) 120RH, make sure that the EMER pushbutton switch is released (the position out/indicator light is off).
(5) In the cockpit, on overhead panel 25VU, make sure that:

EMER EXIT LT switch 4WL is in the OFF position.
No PED switch 190RH is in the OFF position.
EMER EXIT LT OFF indicator 5WL is ON.

Subtask 33-51-00-861-067-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Energize the Cabin Intercommunication Data System (CIDS) (Ref. AMM TASK 23-73-00-861-001).

Subtask 33-51-00-865-075-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	LIGHTING/EMER LT/CABIN	2WL	H06
49VU	LIGHTING/EMER LT/CABIN	1WL	H05
122VU	LIGHTING/CABIN/EMER/LT	3WL	V07

4. Procedure
Subtask 33-51-00-740-052-A

A. BITE Check of the Emergency Power Supply Units (EPSUs)
(1) Do this test:

ACTION	RESULT
1.In the cockpit, on the MCDU:	In the cockpit, on the MCDU:
Push line select key CIDS 1.	Menu page CIDS 1 comes into view.
Push the line select key SYSTEM TESTS.	The menu page SYSTEM TESTS comes into view.
Push the line select key EPSU SYS TEST.	The menu page EPSU SYS TEST comes into view.
Push the line select key START TEST.	The system test starts and the message TEST IN PROGRESS 60S comes into view, then the message TEST OK comes into view.
Push the line select key RETURN until the menu page SYSTEM REPORT/TEST comes into view.

5. Close-up
Subtask 33-51-00-862-066-A

A. Put the aircraft back to the serviceable condition.
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.8 from Aug 2017] 2026.04.01 00:57:17 UTC