Deactivation of the BSCU Channel/System 1 or 2

TASK 32-42-00-040-007-A
Deactivation of the BSCU Channel/System 1 or 2

1. Reason for the Job
MMEL 32-42-03A
BRAKING/STEERING CONTROL UNIT (BSCU) CHANNEL 1
MMEL 32-42-04A
BRAKING/STEERING CONTROL UNIT (BSCU) CHANNEL 2
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 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

3. Job Set-up
Subtask 32-42-00-860-100-A

A. Aircraft Maintenance Configuration
(1) On the panel 400VU, make sure that the landing gear control lever is in the DOWN position.
(2) Make sure that the CAPT and F/O brake pedals are released.
(3) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(4) On the panel 402VU, make sure that the A/SKID & N/W STRG switch is at ON.
(5) Put the WARNING NOTICE(S) in position to tell persons not to operate:

the landing gear control-lever
the A/SKID & N/W STRG switch
the brake pedals.

Subtask 32-42-00-865-074-A

B. Table of the circuit breakers used in this procedure:

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

4. Procedure
Subtask 32-42-00-040-057-D

A. Deactivation of the BSCU System 1 or 2
(1) If there is loss of one BSCU system, on the upper ECAM DU, make sure that the BRAKES SYS 1 FAULT or BRAKES SYS 2 FAULT warning is shown.
(a) Get access to the SYSTEM REPORT/TEST/L/G page (Ref. AMM TASK 31-32-00-860-009).
(b) Print the trouble shooting data, the ground report, the ground scanning, the class 3 fault messages, and the Post Flight Report (PFR) of the related BSCU as follows:

ACTION	RESULT
- Push the line key adjacent to the BSCU1 or BSCU2 indication.	- The BSCU1 or BSCU2 page comes into view.
- Push the line key adjacent to the TROUBLE SHOOT DATA indication.	- The TROUBLE SHOOT DATA page comes into view.
- Push the line key adjacent to the PRINT indication.
- Push the line key adjacent to the RETURN indication.	- The BSCU1 or BSCU2 page comes into view.
- Push the line key adjacent to the GROUND REPORT indication.	- The GROUND REPORT page comes into view.
- Push the line key adjacent to the PRINT indication.
- Push the line key adjacent to the RETURN indication.	- The BSCU1 or BSCU2 page comes into view.
- Push the line key adjacent to the GROUND SCANNING indication.	- The GROUND SCANNING page comes into view.
- Push the line key adjacent to the PRINT indication.
- Push the line key adjacent to the RETURN indication.	- The BSCU1 or BSCU2 page comes into view.
- Push the line key adjacent to the CLASS 3 FAULTS indication.	- The CLASS 3 FAULTS page comes into view.
- Push the line key adjacent to the PRINT indication.
- Push the line key adjacent to the RETURN indication until you get the CFDS MENU page.	- The CFDS MENU page comes into view.
- Push the line key adjacent to the POST FLIGHT REP PRINT indication.

NOTE: It is important to keep these documents to do the maintenance of the BSCU in shop.

Open, safety and tag the circuit breaker 2GG.

(d) On the upper ECAM DU, if the BRAKES SYS 2 FAULT warning is shown:

Open, safety and tag the circuit breaker 4GG.

(2) After deactivation of one BSCU system and before each flight:

On the MCDU, get access to the CFDS MENU page.
Push the line key adjacent to the CFDS indication.
Push the line key adjacent to the LAST LEG REPORT indication.
On the LAST LEG REPORT page, make sure that none of the following fault messages related to the L/G SYS DISAGREE caution message is recorded:
R L/G DOOR CLOSED PROX SNSR 26GA TGT POS
L L/G DOOR CLOSED PROX SNSR 27GA TGT POS
R L/G DOOR CLOSED PROX SNSR 28GA TGT POS
L L/G DOOR CLOSED PROX SNSR 29GA TGT POS
N L/G DOOR CLOSED PROX SNSR 30GA TGT POS
N L/G DOOR CLOSED PROX SNSR 31GA TGT POS
R L/G DOOR OPEN PROX SNSR 32GA TGT POS
L L/G DOOR OPEN PROX SNSR 33GA TGT POS
R L/G DOOR OPEN PROX SNSR 34GA TGT POS
L L/G DOOR OPEN PROX SNSR 35GA TGT POS
N L/G R DOOR OPEN PROX SNSR 36GA TGT POS
N L/G L DOOR OPEN PROX SNSR 37GA TGT POS
N L/G R DOOR OPEN PROX SNSR 38GA TGT POS
N L/G L DOOR OPEN PROX SNSR 39GA TGT POS

(3) On the MCDU, push the line key adjacent to the RETURN indication until the CFDS menu page comes into view.
(4) Make an entry in the log book to tell persons that the BSCU system 1 or 2 is deactivated.

5. Close-up
Subtask 32-42-00-860-101-A

A. Put the aircraft back to the serviceable condition.
(1) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 00:47:27 UTC