Self-Test of the ECB

TASK 49-00-00-710-005-A
Self-Test of the ECB

WARNING: BEFORE YOU DO A SELF-TEST OF THE ECB, MAKE SURE THAT THERE IS NO OTHER MAINTENANCE TASK ON THE APU AT THE SAME TIME. DURING THE SELF-TEST, THE ECB WILL CAUSE THE IGNITION PLUG TO FIRE A NUMBER OF TIMES.

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

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. 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-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-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-32-00-860-001-A	Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page
TASK 31-60-00-860-001-A	EIS Start Procedure

3. Job Set-up
Subtask 49-00-00-860-073-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) or (Ref. AMM TASK 24-41-00-861-002).
(2) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On overhead panel 25VU, push the APU MASTER SW pushbutton switch (the ON legend comes on).
(4) Do the procedure to get the SYSTEM/REPORT TEST item APU (Ref. AMM TASK 31-32-00-860-001).

Subtask 49-00-00-865-067-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

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 49-00-00-740-051-A ** ON A/C NOT FOR ALL

A. Self-Test of the ECB

ACTION	RESULT
1.On the MCDU: push the pushbutton switch adjacent to the APU indication.	On the MCDU: the APU page is shown.
2.On the MCDU: push the pushbutton switch adjacent to the SYSTEM SELF-TEST indication.	On the APU SYSTEM SELF-TEST page: the TEST OK is shown if the ECB is serviceable.

5. Close-up
Subtask 49-00-00-860-074-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
(2) On overhead panel 25VU, release the APU MASTER SW pushbutton switch (the ON legend goes off).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002) or (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 12:41:42 UTC