Removal of the BMC

TASK 36-11-34-000-001-A
Removal of the BMC

ZONE: 121
ZONE: 122
FIN: 1HA1
FIN: 1HA2

1. Reason for the Job

NOTE: The procedure is the same for the BMC 1HA1 and 1HA2.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
122	AVIONICS COMPARTMENT
811

C. Referenced Information

REFERENCE	DESIGNATION
Bleed Monitoring Computer (BMC)

3. Job Set-up
Subtask 36-11-34-010-050-A

A. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) in position at the access door 811.
(2) Open the access door 811.

Subtask 36-11-34-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1HA1 (BMC1)
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
FOR FIN: 1HA2 (BMC2)
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

4. Procedure
Subtask 36-11-34-020-051-A

A. Removal of the BMC
(1) Loosen the nut (4).
(2) Lower the nut (4).
(3) Pull the BMC (1) on its rack (3) to disconnect the electrical connectors (2).
(4) Remove the BMC (1) from its rack (3).
(5) Put CAP - BLANKING on the disconnected electrical connectors.

[Rev.10 from 2021] 2026.04.01 01:08:58 UTC