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

TASK 49-61-34-400-003-A
Installation 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)

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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 25-55-11-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-11-400-003-A	Installation 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 25-55-12-400-003-A	Installation of the Sidewall Panels in the Aft Cargo Compartment - FR59/FR65
TASK 31-32-00-860-001-A	Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-008-A	Close the Bulk Cargo-Compartment Door
TSM 49-70-00-810-821	Data Memory Module P20 Fault (131-9(A))
ECB - Removal/Installation ** ON A/C NOT FOR ALL
ECB - Removal/Installation ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 49-61-34-860-064-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) On panel 25VU, make sure that the APU MASTER SW p/bsw is OFF position.
(3) Make sure there is a WARNING NOTICE(S) in the cockpit to tell persons not to start the APU.

Subtask 49-61-34-865-062-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

Subtask 49-61-34-010-060-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that BULK cargo-compartment door 827 is open.
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is at BULK cargo-compartment door 827.
(3) Make sure that access panel 162EW is removed (Ref. AMM TASK 25-55-12-000-003).

Subtask 49-61-34-010-060-C ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that AFT cargo-compartment door 826 is open.
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is below AFT cargo-compartment door 826.
(3) Make sure that access panel 152FW is removed (Ref. AMM TASK 25-55-11-000-003).

4. Procedure
Subtask 49-61-34-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the ECB
(1) Make sure that there is no Class 3 DMM fault before you install the ECB. If there is a DMM Class 3 fault, do the applicable troubleshooting procedure TSM 49-70-00-810-821.

NOTE: If there is a Class 3 DMM fault, the information in the ECB can be corrupted when you start the APU.

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

(2) If you install a new ECB, make sure that the DMM was updated with the hour/cycle information of the ECB that you removed.

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

(3) Remove the blanking cap from the electrical connection (4).
(4) Do an inspection of the component interfaces and the adjacent area.

NOTE: The weight of the ECB is 5.7 kg (12.57 lb).

(5) Put the ECB (3) in position on the tray (1).
(6) Carefully push the ECB (3) to engage the electrical connection (4).
(7) Make sure that the ECB (3) and the electrical connection (4) are fully engaged.
(8) Move the fluted knobs (2) up to engage the feet on the front face of the ECB (3).
(9) Turn the fluted knobs (2) clockwise to tighten the ECB (3) in position on the rack (1). When the fluted knobs (2) are correctly tightened, you cannot see the red marks on the threads.

Subtask 49-61-34-865-063-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close 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 49-61-34-740-076-A ** ON A/C NOT FOR ALL

C. Do the APU SYSTEM SELF-TEST to make sure that the ECB and the APU LRU's are serviceable.
(1) Set the CFDS to get the SYSTEM REPORT/TEST page for the APU. (Ref. AMM TASK 31-32-00-860-001)
(2) On panel 25VU, set the APU MASTER SW pushbutton to ON.
(3) Do this test.

ACTION	RESULT
1.On the MCDU: Push the pushbutton adjacent to the SYSTEM SELF-TEST indication.	On the MCDU: The APU SYSTEM SELF-TEST page shows and the message IN PROGRESS Comes on.
	If the test is satisfactory, the message TEST OK Comes on. This indicates that all LRU's are serviceable.
	If the test is not satisfactory, the name and the ATA reference number of the unserviceable LRU shows.
Push the pushbutton adjacent to the RETURN display.	The APU menu page comes on.
Push the pushbutton adjacent to the RETURN display.	The SYSTEM REPORT/TEST page comes on.
Push the pushbutton adjacent to the RETURN display.	The CFDS page comes on.

Subtask 49-61-34-740-077-A ** ON A/C NOT FOR ALL

D. Additional Check Procedure
(1) Set the CFDS to get the SYSTEM REPORT/TEST page for the APU. (Ref. AMM TASK 31-32-00-860-001)

ACTION	RESULT
1.On the MCDU, in use: Push the line key adjacent to the LRU IDENTIFICATION indication.	On the MCDU: The LRU IDENTIFICATION page comes on. NOTE: Make sure that the P/N shown on the LRU IDENTIFICATION page is the same as the P/N given on the front face of the computer. If the P/N is not the same, you must remove the computer and return it to the shop.

5. Close-up
Subtask 49-61-34-410-053-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Set the APU MASTER SW pushbutton switch to the OFF position.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Install access panel 162EW (Ref. AMM TASK 25-55-12-400-003).
(4) Close BULK cargo-compartment door 827 (Ref. AMM TASK 52-30-00-860-008)
(5) Remove the access platform(s).

Subtask 49-61-34-410-053-C ** ON A/C NOT FOR ALL

A. Close Access
(1) Set the APU MASTER SW pushbutton switch to the OFF position.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Install access panel 152FW (Ref. AMM TASK 25-55-11-400-003).
(4) Remove the access platform(s).
(5) Close AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).

Subtask 49-61-34-860-065-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 01:31:45 UTC