__________________
Shutdown of the APU which operates to do maintenance tasks.
2.
Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-33-21-618-001 Pre-conditioning through the HP Ground Connection 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
from the External Power 31-60-00-860-001 EIS Start Procedure 31-60-00-860-002 EIS Stop Procedure 49-00-00-860-003 APU Start by External Power (GTCP 36-300)
3. Job Set-up
__________ Subtask 49-00-00-860-061
A. Aircraft Maintenance Configuration
(1)
The APU operates to do maintenance tasks (Ref. TASK 49-00-00-860-003).
(2)
Prepare to energize the aircraft electrical circuits from the external power (Ref. 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. TASK 12-33-21-618-001).
(4) Make sure the lower ECAM DU is on (Ref. TASK 31-60-00-860-001) and shows the APU page.
4. Procedure
_________ Subtask 49-00-00-860-062
A. APU Shutdown
CAUTION : OBEY THE SAFETY PRECAUTIONS.
_______
CAUTION : DO NOT SET THE BATTERIES TO OFF BEFORE THE AIR INTAKE IS FULLY
_______ CLOSED. IF THE AIR INTAKE IS NOT FULLY CLOSED, THE APU IMMEDIATELY STARTS A SHUTDOWN SEQUENCE, BUT WITHOUT COOL-DOWN AND WITHOUT DE-OILING. THIS CAN CAUSE:
-OIL FUMES AND/OR SMOKE IN THE CABIN
-AN INCORRECT LOW OIL-LEVEL ON THE APU OIL RESERVOIR. NOTE : Obey the safety precautions for the operation of the APU
____
(Ref. TASK 49-00-00-860-003).
-------------------------------------------------------------------------------
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.
2. On the APU section on the panel 25VU:
-push the APU MASTER SW pushbutton switch to the off position.
On the AIR COND section on the panel30VU:
-
the ON legend in the APU BLEEDpushbutton switch goes off (the APUbleed 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
____ (if the cool-down-timer was not changed: 90 seconds).
On the APU section on the panel 25VU:
-
the ON legend in the APU MASTER SWpushbutton switch goes off.
-
the AVAIL legend in the APU STARTpushbutton switch goes off.
NOTE : The ECB (59KD) controls and
____ monitors the APU cooldown cycle and the shutdown sequence.
On the APU page on the lower ECAM DU:
-
the APU speed (N%) decreases to 75%.
-
the BLEED valve symbol changes to the closed position.
-
the BLEED pressure dcreases.
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.
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
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.
After the cooldown cycle is complete:
-
the APU shutdown sequence starts.
On the APU page on the lower ECAM DU:
-
the APU indications show that the APU is in the shutdown sequence and stops.
On the APU section on the panel 25VU:
-
the ON legend in the APU MASTER SWpushbutton switch goes off.
-
the AVAIL legend in the APU STARTpushbutton switch goes off.
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