Failure of the HP Fuel SOV Closed Discrete Output on the EIU 1

TASK 73-25-00-810-861-A
Failure of the HP Fuel SOV Closed Discrete Output on the EIU 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-61-34-000-002	Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-002	Installation of the Air-Conditioning System Controller
AMM 21-63-34-000-001	Removal of the Zone Controller
AMM 21-63-34-400-001	Installation of the Zone Controller
ASM 732509
AMM 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
AMM 73-25-34-710-040	Operational Test of the Engine Interface Unit
AMM 73-25-34-710-043	Operational Test of the Engine Interface Unit

3. Fault Confirmation
Subtask 73-25-00-710-170-A ** ON A/C NOT FOR ALL

A. Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-040.

Subtask 73-25-00-710-170-B ** ON A/C NOT FOR ALL

A. Do the operational test of the engine interface unit through the CFDS AMM 73-25-34-710-043.

4. Fault Isolation
Subtask 73-25-00-810-110-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CHECK ZONE CONT 8HK/EIU 1 CIRCUIT:

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the EIU-1 (1KS1) to the zone temperature controller (8HK) pin AB/1E to pin AB/1K ASM 732509.

Subtask 73-25-00-810-110-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CHECK ZONE CONT 8HK/EIU 1 CIRCUIT:

replace the CONT-AIR COND SYSTEM 1 [47HH] and CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 and AMM 21-61-34-400-002.

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the EIU-1 (1KS1) to the ACSC (47HH, 57HH) pin AB/1E to pin AB/1K ASM 732509.

Subtask 73-25-00-710-171-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:35:43 UTC