Loss of the BSCU BUS 2 Output Detected by the CFDIU

TASK 32-42-00-810-870-A
Loss of the BSCU BUS 2 Output Detected by the CFDIU

1. Possible Causes

BSCU [10GG]
wiring from the BSCU pins AA/6E, 6F to the first terminal block
A/SKID & N/W STRG switch (5GG)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
ASM 324201
AMM 32-42-34-000-001	Removal of the Braking/Steering Control Unit (BSCU)
AMM 32-42-34-400-001	Installation of the Braking/Steering Control Unit (BSCU)
AMM 32-46-00-740-001	BITE Test of the BSCU
ASM 324601

3. Fault Confirmation
Subtask 32-42-00-740-120-B

A. Test
(1) Do a reset of the BSCU with the A/SKID AND NOSE WHEEL switch (5GG).
(2) Do the BITE test of the BSCU AMM 32-46-00-740-001
(3) On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

NOTE: If the fault message "NO BSCU 1 DATA" is shown on the Current Flight Report or on the Post Flight Report after reset of the anti skid and nose wheel steering system with the A/SKID & NOSE WHEEL control switch (5GG):

No action is necessary.

4. Fault Isolation
Subtask 32-42-00-810-125-B

A. If the test gives the maintenance message NO BSCU 1 DATA:

replace the BSCU [10GG] AMM 32-42-34-000-001 and AMM 32-42-34-400-001.

(1) If the fault continues:

do a check and repair the wiring from the BSCU pins AA/6E, 6F to the first terminal block ASM 324601.

(2) If the fault continues:

replace the A/SKID & N/W STRG switch (5GG) ASM 324201.

Subtask 32-42-00-740-121-A

B. Test
(1) Do the test given in Para.3.

[Rev.8 from Aug 2018] 2026.04.04 04:31:36 UTC