On the ground the APU fire extiguishing system operates automatically (Ref.
26-22-00).
During the flight you must push the APU AGENT pushbutton switch 10WF on the
APU panel 20VU to operate the fire extinguishing system (Ref. 26-22-00).
APU Emergency Shutdown - Component Location
Figure 001 (SHEET 1)
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APU Emergency Shutdown - Component Location
Figure 001 (SHEET 2)
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APU Emergency Shutdown - Block Diagram
Figure 002
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4. Operation/Control and Indication:_________________________________ (Ref. Fig. 002)
A. Automatic Emergency Shutdown For the automatic emergency shutdown the ECB receives a shutdown signal from the fire emergency-stop relays 1 (5WF) and 2 (6WF) (Ref. 26-22-00). The ECB then starts the shutdown sequence.
B. Manual Emergency Shutdown For the manual emergency shutdown the ECB receives a shutdown signal from:
-
the APU FIRE PUSH pushbutton switch 12WG on the overhead panel 20VU,
-
the APU SHUT OFF pushbutton switch 1KL at the fuselage of the nose
landing gear, on the external power control panel 108VU.
The ECB then starts the shutdown sequence.
C. APU Shutdown Sequence If the ECB receives the emergency shutdown signal during the operation of the APU, it stops the APU immediately without a cooldown cycle. If the ECB receives the emergency shutdown signal during the cooldown cycle of a shutdown, it stops the APU also immediately. The shutdown sequence is the same than an APU automatic shutdown without a cooldown cycle (Ref. 49-61-00).
D. Indications When an emergency shutdown of the APU occurs, the upper ECAM display unit shows the warning: APU EMER SHUT DOWN MASTER SW ....................OFF
EMERGENCY SHUTDOWN - DESCRIPTION AND OPERATION
______________________________________________
1. General
_______ The APU emergency shutdown-system stops the APU if an emergency occurs. The system is automatically activated on the ground if the APU fire and overheat detection system finds an overtemperature in the APU compartment (Ref. 26-13-00). You can also stop the APU manually from:
-
the cockpit,
-
the external power control panel on the nose landing gear (only when the aircraft is on the ground).
2. Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------1KL P/BSW - APU SHUT OFF 108VU 123/ 124
3. System Description
__________________ (Ref. Fig. 002) The APU has an APU emergency shutdown-system. The Electronic Control Box (ECB) receives the emergency shutdown signal and stops the APU. An emergency shutdown occurs automatically, if the APU fire and overheat detection system finds an overtemperature in the APU compartment (Ref. 26-13-00). The manual emergency shutdown switches are:
-
the APU FIRE PUSH pushbutton switch 12WG on the overhead panel 20VU in the cockpit,
-
the APU SHUT OFF pushbutton switch 1KL on the nose landing gear, on the external power control panel 108VU (this is only available when the aircraft is on the ground).
On the ground the APU fire extiguishing system operates automatically (Ref.
26-22-00).
During the flight you must push the APU AGENT pushbutton switch 10WF on the
APU panel 20VU to operate the fire extinguishing system (Ref. 26-22-00).
4. Operation/Control and Indication:
_________________________________
(Ref. Fig. 002)
A. Automatic Emergency Shutdown For the automatic emergency shutdown the ECB receives a shutdown signal from the fire emergency-stop relays 1 (5WF) and 2 (6WF) (Ref. 26-22-00). The ECB then starts the shutdown sequence.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-62-00Page 1 201-210, Config-2 Aug 01/05
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APU Emergency Shutdown - Component Location
Figure 001 (SHEET 1)
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APU Emergency Shutdown - Component Location
Figure 001 (SHEET 2)
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APU Emergency Shutdown - Block Diagram
Figure 002
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B. Manual Emergency Shutdown For the manual emergency shutdown the ECB receives a shutdown signal from:
-
the APU FIRE PUSH pushbutton switch 12WG on the overhead panel 20VU,
-
the APU SHUT OFF pushbutton switch 1KL at the fuselage of the nose
landing gear, on the external power control panel 108VU.
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