BITE Test of the BSCU

TASK 32-46-00-740-001-A
BITE Test of the BSCU

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

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)
TASK 31-32-00-860-009-A	Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 34-10-00-860-004-A	Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-01	Automatic Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-02	Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
TASK 34-10-00-860-005-A	ADIRS Stop Procedure

3. Job Set-up
Subtask 32-46-00-860-052-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On the panel 400VU, make sure that the Landing Gear control-lever is set to DOWN.
(3) On the panel 402VU, make sure that the A/SKID & N/W STRG switch is at ON.
(4) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).
(5) Do the IR alignment procedure. (Ref. AMM TASK 34-10-00-860-004)
(6) On one MCDU, get the SYSTEM REPORT/TEST/L/G Page (Ref. AMM TASK 31-32-00-860-009).

Subtask 32-46-00-941-054-A

B. Safety Precautions
(1) On the panel 400VU, put a WARNING NOTICE(S) on the Landing Gear control-lever to tell persons not to move it.

Subtask 32-46-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

4. Procedure
Subtask 32-46-00-740-050-B

A. Do this test:

NOTE: This test is for CHAN 1. For CHAN 2, use the indications between parentheses.

ACTION	RESULT
1.On the MCDU, push the line key adjacent to the BSCU 1(2) indication.	the BSCU CHAN 1(2) page comes into view.
2.Push the line key adjacent to the SYSTEM TESTS indication.	the BSCU CHAN 1(2)/SYSTEM TESTS page comes into view.
3.Push the line key adjacent to the LRU WIRING & BSCU TEST indication.	the BSCU CHAN 1(2)/LRU WIRING & BSCU TEST page comes into view with INITIAL CONDITIONS
4.Do a check of these initial conditions:
on the ECAM control panel, push the ELEC key	On the lower ECAM DU, the ELEC page comes into view. On the ELEC page: the TR1(2) energizes the DC1(2) busbar.
on the panel 402VU, make sure that the A/SKID & N/W STRG switch is at ON.
5.Push the line key adjacent to the START TEST indication. NOTE: If the IN PROGRESS 4S indication stays in view, push the line key adjacent to the RETURN indication. Do a check of all the initial conditions and do the test again.	On the BSCU CHAN 1(2) page: the IN PROGRESS 4S indication is shown then the NO FAULT DETECTED and PRESS RETURN indications come into view when the system is serviceable. If the system is not serviceable: a list of fault messages comes into view. NOTE: The prompt ">" to the right of the Class number show that there are TSD pages related to this fault. Push the line key adjacent to the prompt to get access to these pages. or if one or more of the initial conditions is not satisfactory, these indications come into view: . TEST NOT PERFORMED . the initial condition(s) that is (are) not satisfactory. or the TEST TIME OUT indication comes into view when the test is not completed in the time limit. Push the line key adjacent to the RETURN indication and do the test again.

5. Close-up
Subtask 32-46-00-860-051-A

A. Put the aircraft back to its initial configuration.
(1) On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
(2) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
(3) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(4) Remove the warning notice(s).
(5) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:50:10 UTC