Loss of the Bus from the EIU1

TASK 36-11-00-810-A08-A
Loss of the Bus from the EIU1

1. Possible Causes

EIU-1 [1KS1]
wiring
BMC-1 [1HA1]
BMC-2 [1HA2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 36-11-00-740-802	BITE Test of the Engine Bleed Air System (EBAS) (System Test)
ASM 361103
AMM 36-11-34-000-001	Removal of the BMC
AMM 36-11-34-400-001	Installation of the BMC
AMM 73-25-34-000-802	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-802	Installation of the Engine Interface Unit (EIU)

3. Fault Confirmation
Subtask 36-11-00-710-466-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the EBAS AMM 36-11-00-740-802.

4. Fault Isolation
Subtask 36-11-00-810-415-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
NO DATA FROM EIU1

Replace the EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.

(1) If the fault continues:

Subtask 36-11-00-810-453-A ** ON A/C NOT FOR ALL

B. If the fault continues:
(1) Do a check of the wiring between:
- Pin AA/8C of the BMC1 (1HA1) and pin AB/5H of the EIU1 (1KS1) ASM 361103.
- Pin AA/8D of the BMC1 (1HA1) and pin AB/5K of the EIU1 (1KS1) ASM 361103.
(a) If the wiring is not correct:

Repair or replace the wiring .

(b) If the wiring is correct:

Replace the BMC-1 [1HA1] AMM 36-11-34-000-001 and AMM 36-11-34-400-001.

(2) Do the test given in Para. 3.

Subtask 36-11-00-810-472-A ** ON A/C NOT FOR ALL

C. If the fault continues:
(1) Do a check of the wiring between:
- Pin AA/9C of the BMC2 (1HA2) and pin AB/5H of the EIU1 (1KS1) ASM 361103.
- Pin AA/9D of the BMC2 (1HA2) and pin AB/5K of the EIU1 (1KS1) ASM 361103.
(a) If the wiring is not correct:

Repair or replace the wiring .

(b) If the wiring is correct:

Replace the BMC-2 [1HA2] AMM 36-11-34-000-001 and AMM 36-11-34-400-001.

Subtask 36-11-00-710-467-A ** ON A/C NOT FOR ALL

D. After the subsequent flight, make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:33:55 UTC