Removal of the Alternate Braking Control Unit (ABCU)

TASK 32-43-34-000-001-A
Removal of the Alternate Braking Control Unit (ABCU)

FIN: 95GG ** ON A/C NOT FOR ALL

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	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
Alternate Braking Control Unit (ABCU) (95GG)

3. Job Set-up
Subtask 32-43-34-861-050-A ** ON A/C NOT FOR ALL

A. Energize the Ground Service Network (Ref. AMM TASK 24-42-00-861-001)

Subtask 32-43-34-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ABCU &/Y BRK/PRESS IND	61GG	C10
** ON A/C NOT FOR ALL
121VU	ABCU/HOT BUS/SPLY	110GG	P30
** ON A/C NOT FOR 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
** ON A/C NOT FOR ALL
121VU	ABCU/HOT BUS/SPLY	110GG	P31

Subtask 32-43-34-010-051-A ** ON A/C NOT FOR ALL

C. Get Access to the Avionics Compartment
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 822.
(2) Open the access door 822.

4. Procedure
Subtask 32-43-34-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the ABCU
(1) Disconnect the electrical connectors (1) and (2).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Loosen the screws (4) and the washers (3).
(4) Remove the ABCU (6) from its bracket (7).

[Rev.10 from 2021] 2026.04.01 00:49:14 UTC