ECB internal Fault (131-9(A))

TASK 49-00-81-810-866-A
ECB internal Fault (131-9(A))

1. Possible Causes

ECB INTERNAL FAILURE
ELECTRONIC CONTROL BOX [59KD]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 49-00-81-710-082-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 '>' adjacent to the related CFDS failure message:

the MCDU menu shows:
ECB INTERNAL FAILURE

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

4. Fault Isolation
Subtask 49-00-81-810-069-A ** ON A/C NOT FOR ALL

A. If the APU GND SCANNING gives the maintenance message

ECB (59KD)

With the maintenance message associated with one of the Fault Code Numbers (FCN) that follow:
15, 25, 32, 147, 170, 171, 172, 185, 186
20, 50, 53, 181, 182, 184, 233, 236
75, 80 or 84

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

Subtask 49-00-81-710-083-A ** ON A/C NOT FOR ALL

B. Do a check of the APU GND SCANNING menu to verify the fault is not present.

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