Removal of the Electronic Control Box (ECB) (131-9(A))

TASK 49-61-34-000-003-A
Removal of the Electronic Control Box (ECB) (131-9(A))

ZONE: 150
FIN: 59KD ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
162EW
152FW

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 25-55-11-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-12-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR59/FR65
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-006-A	Open the Bulk Cargo-Compartment Door
ECB - Removal/Installation ** ON A/C NOT FOR ALL
ECB - Removal/Installation ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 49-61-34-860-062-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to start the APU.

Subtask 49-61-34-865-061-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

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

Subtask 49-61-34-010-058-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Open BULK cargo-compartment door 827 (Ref. AMM TASK 52-30-00-860-006).
(2) Put the ACCESS PLATFORM 2M (6 FT) at BULK cargo-compartment door 827.
(3) Remove access panel 162EW (Ref. AMM TASK 25-55-12-000-003).

Subtask 49-61-34-010-058-C ** ON A/C NOT FOR ALL

C. Get Access
(1) Open AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) below AFT cargo-compartment door 826.
(3) Remove access panel 152FW (Ref. AMM TASK 25-55-11-000-003).

4. Procedure
Subtask 49-61-34-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the ECB

WARNING: SUPPORT THE UNIT/ASSEMBLY. THE UNIT/ASSEMBLY IS HEAVY. IF YOU DO NOT SUPPORT IT, IT WILL FALL. THIS CAN CAUSE INJURY TO PERSONS, AND/OR DAMAGE TO EQUIPMENT.

CAUTION: DO NOT REPLACE THE ECB AND THE DATA MEMORY MODULE AT THE SAME TIME.

(1) Make sure that there is no Class 3 DMM fault before you remove the ECB.

NOTE: This step is not applicable if it is necessary to correct a Class 3 DMM fault.

(2) Make sure that the DMM is updated with the hour/cycle information before you remove the ECB.

NOTE: After you correct a Class 3 fault, the DMM is updated with the ECB information. When a new ECB is installed, it is updated with the information stored in the DMM.

NOTE: This step is not applicable if it is necessary to correct a Class 3 DMM fault.

(3) At the ECB tray (1), turn the fluted knobs (2) counterclockwise to release the ECB (3).

NOTE: The ECB points forward in the aircraft that do not have the optional bulk cargo door. Aircraft with the optional bulk cargo door have the ECB that points rearward.

(4) Carefully pull the ECB (3) out from the tray (1) to disconnect the electrical connection (4).
(5) Remove the ECB (3) from the tray (1).
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

[Rev.10 from 2021] 2026.04.01 01:31:43 UTC