Installation of the ECB Mount (131-9(A))

TASK 49-61-53-400-003-A
Installation of the ECB Mount (131-9(A))

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 49-61-34-400-003-A	Installation of the Electronic Control Box (ECB) (131-9(A))
Mount-ECB ** ON A/C NOT FOR ALL
Mount-ECB ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 49-61-53-860-056-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.
(2) Make sure there is a warning notice in the cockpit to tell persons not to start the APU.
(3) Make sure that the access platform is below the AFT cargo-compartment door 826.
(4) Make sure that the AFT cargo-compartment door 826 is open.

Subtask 49-61-53-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

4. Procedure
Subtask 49-61-53-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the ECB Mount
(1) Install the ECB mount (12) to the aircraft structure with the bolts (10) and the washers (11).

NOTE: The ECB installation points forward in those aircraft that do not have the optional bulk cargo door. Aircraft with the optional bulk cargo door, have the ECB installation pointed rearwards.

(2) Install the ECB rack (5) to the mount (12) with the countersunk screws (9).
(3) Connect the bonding jumper (8) to the ECB mount (12) with the washer (7) and the bolt (6).
(4) Install the electrical socket assembly (4) to the ECB rack (5) with the bolts (1) the washers (3) and the nuts (2).

5. Close-up
Subtask 49-61-53-860-057-A ** ON A/C NOT FOR ALL

A. Put the system back to the serviceable condition.
(1) Install the ECB (59KD) (Ref. AMM TASK 49-61-34-400-003).

[Rev.10 from 2021] 2026.04.01 01:31:49 UTC