Read CFDS for APU Class 3 Fault(s) of BACK-UP START CONTACTOR and START CONTACTOR (131-9(A))

TASK 49-40-00-740-001-A
Read CFDS for APU Class 3 Fault(s) of BACK-UP START CONTACTOR and START CONTACTOR (131-9(A))

FIN: 10KA ** ON A/C NOT FOR ALL
FIN: 5KA ** 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-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)
TSM 49-40-00-810-807	Contactor (5KA) Fault (131-9(A))
TSM 49-40-00-810-808	Contactor (10KA) Fault (131-9(A))

3. Job Set-up
Subtask 49-40-00-860-050-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 the overhead panel, push the APU MASTER/SW to the ON position.

Subtask 49-40-00-865-054-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
49VU	AUTO FLT/MCDU/1	11CA1	B01
** ON A/C NOT FOR ALL
49VU	AUTO FLT/MCDU/1	11CA1	H07
** ON A/C NOT FOR ALL
121VU	PTR/SPLY	6TW	J21
121VU	CFDS/CFDIU/SPLY	2TW	J18
121VU	CFDS/CFDIU/BACK/UP	8TW	J17
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
** ON A/C NOT FOR ALL
121VU	PTR/SPLY	6TW	J44
121VU	CFDS/CFDIU/SPLY	2TW	J41
121VU	CFDS/CFDIU/BACK/UP	8TW	J40

4. Procedure
Subtask 49-40-00-740-050-A ** ON A/C NOT FOR ALL

A. Do this procedure:

ACTION	RESULT
1.On the MCDU 1(2): Turn the BRT knob to change brightness.
2.Push the MCDU MENU mode key.	On the MCDU 1(2): The MCDU MENU page comes into view.
3.Push the line key adjacent to the CFDS indication.	The CFDS menu page comes into view.
4.Push the line key adjacent to the SYSTEM REPORT/TEST indication.	The SYSTEM REPORT/TEST page comes into view.
5.Push the NEXT PAGE function key.	The 2nd. SYSTEM REPORT/TEST page comes into view.
6.Push the line key adjacent to the APU indication.	The APU system page comes into view.
7.Push the line key adjacent to the CLASS 3 FAULTS indication.	The APU CLASS 3 FAULTS page comes into view.
	If the maintenance message CONTACTOR (10KA) with FCN 121 is shown: do the trouble shooting procedure TSM 49-40-00-810-808.
	If the maintenance message CONTACTOR (5KA) with FCN 124 is shown: do the trouble shooting procedure TSM 49-40-00-810-807.
8.Push the line key adjacent to the RETURN indication until:	The SYSTEM REPORT/TEST page comes into view.

5. Close-up
Subtask 49-40-00-860-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial 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 the overhead panel, push the APU MASTER/SW to OFF.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002)

[Rev.10 from 2021] 2026.04.01 01:30:02 UTC