#quot#LCV-OPEN#quot#- Signal Fault (131-9(A))

TASK 49-00-81-810-864-A
"LCV-OPEN"- Signal Fault (131-9(A))

1. Possible Causes

LOAD VALVE OPEN SIGNAL SHOWS CIRCUIT FAILURE
aircraft wiring
ELECTRONIC CONTROL BOX [59KD]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 361201
AMM 49-61-34-000-003	Removal of the Electronic Control Box (ECB) (131-9(A))
AMM 49-61-34-400-003	Installation of the Electronic Control Box (ECB) (131-9(A))

3. Fault Confirmation
Subtask 49-00-81-710-078-A ** ON A/C NOT FOR ALL

A. Read-out of ECB Trouble-Shooting Data
(1) Put the APU MASTER SW to the ON position.
(2) Get access to the APU LAST LEG/PREVIOUS LEG report.
(3) Push the '>'-key adjacent to the related CFDS failure message.
(4) If the MCDU menu shows:
LOAD VALVE OPEN SIGNAL SHOWS CIRCUIT FAILURE

do the Fault Confirmation that follows:

(a) Get access to the APU GND SCANNING menu.

4. Fault Isolation
Subtask 49-00-81-810-067-A ** ON A/C NOT FOR ALL

A. If the APU GND SCANNING menu gives the maintenance message:

WRG: LOAD VALVE OPEN SIGNAL

associated with Fault Code Number (FCN) 138

do a check of the aircraft wiring from the ECB (59KD) AB/D6 to
the BLEED MONITORING COMPUTER (1HA1) AB/6A
and
THE BLEED MONITORING COMPUTER (1HA2) AB/6A, ASM 361201.

(1) If the fault continues:

replace the ELECTRONIC CONTROL BOX [59KD] AMM 49-61-34-000-003 and AMM 49-61-34-400-003.

Subtask 49-00-81-710-079-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:37 UTC