To make sure that the APU Automatic Fire Extinguishing System is operative when the APU FIRE Light on External Power Panel is inoperative

TASK 26-22-00-040-010-A
To make sure that the APU Automatic Fire Extinguishing System is operative when the APU FIRE Light on External Power Panel is inoperative

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
NO	NO	NO	0.3	0.3	1

1. Reason for the Job
MMEL 26-22-06A
APU FIRE ON THE EXTERNAL POWER PANEL
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	WARNING NOTICE(S)

B. 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)

3. Job Set-up
Subtask 26-22-00-941-063-A

A. Safety Precautions
(1) Put the WARNING NOTICE(S) in position on the overhead panel 25VU to tell persons not to operate the APU.

Subtask 26-22-00-860-068-A

B. 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).

4. Procedure
Subtask 26-22-00-710-074-A ** ON A/C NOT FOR ALL

WARNING: DO NOT PUSH THE TEST PUSHBUTTON SWITCH ON THE APU/AUTO EXTING SECTION OF OVERHEAD PANEL 50VU WHILE THE APU IS IN OPERATION. IF YOU DO, DISCHARGE OF THE APU-FIRE EXTINGUISHER BOTTLE CAN OCCUR.

A. Operational Test of the Test Circuit

ACTION	RESULT
1.In the APU/AUTO EXTING section of panel 50VU: Push the TEST ON pushbutton during the test.	In the APU/AUTO EXTING section of panel 50VU: The OK legend in the TEST pushbutton switch comes on. NOTE: If the OK legend in the TEST pushbutton switch comes on, all components operate correctly.
2.In the APU/AUTO EXTING section of panel 50VU: Push the RESET pushbutton switch.	In the APU/AUTO EXTING section of panel 50VU: The test circuit sets back.

Subtask 26-22-00-710-074-B ** ON A/C NOT FOR ALL

A. Operational Test of the Test Circuit

NOTE: This test causes a spurious WARNING in ECAM (APU FIRE LOOP A FAULT) because of a FDU hardware modification.

ACTION	RESULT
1.In the APU/AUTO EXTING section of panel 50VU: Push the TEST ON pushbutton during the test.	In the APU/AUTO EXTING section of panel 50VU: The OK legend in the TEST pushbutton switch comes on.
	After 5 seconds, on the ECAM upper display unit: The warning, APU FIRE LOOP A FAULT comes on. NOTE: If the OK legend in the TEST pushbutton switch comes on, all components operate correctly.
2.In the APU/AUTO EXTING section of panel 50VU: Push the RESET pushbutton switch.	In the APU/AUTO EXTING section of panel 50VU: The test circuit sets back.

5. Close-up
Subtask 26-22-00-410-066-A

A. Put the aircraft back to its initial configuration.
(1) Make an entry in the aircraft technical logbook.

Subtask 26-22-00-860-069-A

B. Put the aircraft back to its initial configuration.
(1) 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] 2026.03.31 23:45:27 UTC