Loss of the 2nd BMC (the 1st is lost)

TASK 36-11-00-810-919-A
Loss of the 2nd BMC (the 1st is lost)

1. Possible Causes

BMC-1 [1HA1]
BMC-2 [1HA2]
wiring of the ARINC 429 OUTPUT SIGNAL from the BMC1 (1HA1) pins AA/10C, 11C, 12 to the first terminal block
wiring of the arinc 429 OUTPUT SIGNAL from the BMC2 (1HA2) pins AA/10C, 11C, 12 to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
ASM 361103
AMM 36-11-34-000-001	Removal of the BMC
AMM 36-11-34-400-001	Installation of the BMC

3. Fault Confirmation
Subtask 36-11-00-865-050-A ** ON A/C NOT FOR ALL

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

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

Subtask 36-11-00-710-276-A ** ON A/C NOT FOR ALL

B. Test
Do the operational test of the central warning systems (SDAC) AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 36-11-00-810-170-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance messages :
SDAC1: NO DATA FROM BMC 1+2
or
SDAC2: NO DATA FROM BMC 1+2

(1) If the fault continues:

do a check and repair:
. the wiring of the ARINC 429 OUTPUT SIGNAL from the BMC1 (1HA1) pins AA/10C, 11C, 12 to the first terminal block
. the wiring of the arinc 429 OUTPUT SIGNAL from the BMC2 (1HA2) pins AA/10C, 11C, 12 to the first terminal block ASM 361103.

Subtask 36-11-00-710-277-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:49 UTC