APU Shutdown by External Power

TASK 49-00-00-860-006-A
APU Shutdown by External Power

WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

CAUTION: DO NOT START THE APU WITH ACCESS DOORS 315AL AND 316AR OPEN/REMOVED. THE APU FIRE EXTINGUISHER SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF THE ACCESS DOORS 315AL AND 316AR ARE OPEN/REMOVED.

CAUTION: OBEY THE SAFETY PRECAUTIONS.

FIN: 4005KM ** ON A/C NOT FOR ALL

1. Reason for the Job
Shutdown of the APU which operates to do maintenance tasks.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
811

B. Referenced Information

REFERENCE	DESIGNATION
TASK 12-33-21-618-001-A	Pre-conditioning through the LP Ground Connection (Aircraft Electrical Power Available)
TASK 12-33-21-618-001-A-01	Pre-conditioning through the HP Ground Connection
TASK 12-33-21-618-001-A-02	Pre-conditioning with the APU
TASK 12-33-21-618-001-A-03	Pre-conditioning through the LP Ground Connection (Aircraft Electrical Power Not Available)
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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-910-002-A	Safety Precautions for the Operation of the APU (APS 3200)
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access

3. Job Set-up
Subtask 49-00-00-860-066-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) The APU operates to do maintenance tasks (Ref. AMM TASK 49-00-00-860-005).
(2) Prepare to energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-861-002).
(3) If aircraft system(s) are supplied with bleed air from the APU, stop them.

NOTE: If necessary, prepare the pre-conditioning through the HP ground connection (Ref. AMM TASK 12-33-21-618-001).

(4) Make sure the lower ECAM DU is on (Ref. AMM TASK 31-60-00-860-001) and shows the APU page.

4. Procedure
Subtask 49-00-00-860-067-A ** ON A/C NOT FOR ALL

CAUTION: OBEY THE SAFETY PRECAUTIONS.

CAUTION: DO NOT SET THE BATTERIES TO OFF BEFORE THE AIR INTAKE FLAP IS FULLY CLOSED. IF YOU SET THE BATTERIES TO OFF, AN UNWANTED SHUTDOWN OF THE APU CAN OCCUR IF THERE IS:

POWER TRANSFER FROM THE APU GEN TO EXTERNAL POWER, OR
DISCONNECTION OF THE EXTERNAL POWER.

SUCH SHUTDOWN IS WITHOUT THE COOLDOWN CYCLE AND WITHOUT DE-OILING AND CAN CAUSE:

OIL FUMES AND/OR SMOKE IN THE CABIN
AN INCORRECT LOW OIL LEVEL INDICATION ON THE ECAM APU SYSTEM PAGE.

A. APU Shutdown

NOTE: Obey the safety precautions for the operation of the APU (Ref. AMM TASK 49-00-00-910-002).

ACTION	RESULT
1.If the ON legend in the APU BLEED pushbutton switch is on (the APU supplies bleed air), on the AIR COND section on the panel 30VU: push the APU BLEED pushbutton switch to the off position.	On the AIR COND section on the panel 30VU: the ON legend in the APU BLEED pushbutton switch goes off (the APU bleed air supply stops).
	On the APU page on the lower ECAM DU: the APU bleed-valve symbol changes to the closed position. the BLEED pressure decreases. NOTE: The APU cooldown cycle starts (120 seconds).
2.On the APU section on the panel 25VU: push the APU MASTER SW pushbutton switch to the off position.	On the APU section on the panel 25VU: the ON legend in the APU MASTER SW pushbutton switch goes off. NOTE: The ECB (59KD) controls and monitors the APU cooldown cycle and the shutdown sequence.
	After the cooldown cycle is complete: the APU shutdown sequence starts.
	On the APU section on the panel 25VU: the AVAIL legend in the APU START pushbutton switch goes off.
	On the APU page on the lower ECAM DU: the APU indications show that the APU is in the shutdown sequence and stops.
	If the ON legend in the APU GEN pushbutton switch is on (the APU generator energizes the aircraft electrical circuits): On the ELEC panel 35VU: the ON legend in the APU GEN pushbutton switch goes off.
	On the APU page on the lower ECAM DU: the APU generator symbols change to no power supply.
3.If the ON legend in the APU BLEED pushbutton switch is off (the APU does not supply bleed air), on the APU section on the panel 25VU: push the APU MASTER SW pushbutton switch to the off position.	On the APU section on the panel 25VU: the ON legend in the APU MASTER SW pushbutton switch goes off. the AVAIL legend in the APU START pushbutton switch goes off. NOTE: The ECB (59KD) controls and monitors the APU the shutdown sequence.
	On the APU page on the lower ECAM DU: the APU indications show that the APU is in the shutdown sequence and stops.
	If the ON legend in the APU GEN pushbutton switch is on (the APU generator energizes the aircraft electrical circuits), on the ELEC panel 35VU: the ON legend in the APU GEN pushbutton switch goes off.
	On the APU page on the lower ECAM DU: the APU generator symbols change to no power supply.

5. Close-up
Subtask 49-00-00-860-068-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002), if not longer necessary.
(2) Make sure that the APU air intake-flap is closed.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002), if not longer necessary.
(4) Remove the WARNING NOTICE(S).
(5) Close access door 811 (Ref. AMM TASK 52-41-00-410-002).

NOTE: Continue with the task from which you got the reference to this task.

[Rev.10 from 2021] 2026.04.01 01:25:33 UTC