On the APU FIRE panel 20VU:

-
the SQUIB legend in the AGENT pushbutton switch comes on.

On the ECAM upper display unit:

-
the warning, APU EMER SHUT DOWN MASTER SW .... OFF comes on.

On the glareshield panels 130VU and 131VU:

-
the MASTER CAUT lights come on,

-a single chime is heard.
On the overhead panel 25VU:

 -------------------------------------------------------------------------------
ACTION  RESULT
 -------------------------------------------------------------------------------
R  - the FAULT legend in the pushbutton 
R  APU MASTER SW comes on. 
R  On the FUEL page of the ECAM lower 
R  display unit: 
R  - the APU LP fuel-valve symbol is shown 
R  in the closed position. 
R  13. On the APU FIRE panel 20VU:  On the APU FIRE panel 20VU: 
R  - push the APU FIRE pushbutton  - the SQUIB legend in the AGENT 
R  switch and close the guard.  pushbutton switch goes off. 
R  NOTE : Make sure that the APU FIRE pushbutton switch is in its latched____ 
R  position before you close the guard. 

R  On the ECAM upper display unit: 
R  - the warning, 
R  APU EMER SHUT DOWN 
R  MASTER SW .... OFF 
R  goes off. 
R  On the overhead panel 25VU: 
R  - the FAULT legend in the APU MASTER SW 
R  pushbutton switch goes off. 
R  On the glareshield panels 130VU and 
R  131VU: 
R  - the MASTER CAUT lights go off. 
R  14. On the overhead panel 25VU:  On the overhead panel 25VU: 
R  - release the APU MASTER SW  - the ON legend in the APU MASTER SW 
R  pushbutton switch.  pushbutton switch goes off. 
R  15. On the circuit breaker panel 
R  121VU: 
R  - close the circuit breaker 
R  APU/FUEL/LP VALVE/SPLY 2QF.

R **ON A/C ALL
 5. Close-up
________
 Subtask 26-22-00-860-057

 A. Put the aircraft back to its initial configuration.
 (1)
 Do the EIS stop procedure (Ref. TASK 31-60-00-860-002).

 (2)
 De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).

 APU FIRE EXTINGUISHING - INSPECTION/CHECK
_________________________________________ TASK 26-22-00-210-001 Inspection of the APU Fire-Extinguishing Distribution Piping
 1.
 Reason for the Job

__________________
 Refer to the MPD TASK: 262200-04

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
 No specific warning notice
 No specific access platform 4.0 m (13 ft. 1 in.)

 3. Job Set-up

__________ Subtask 26-22-00-941-056
 A. Put the warning notice on the overhead panel 25VU to tell the persons not to operate the APU.
 Subtask 26-22-00-865-065
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
 Subtask 26-22-00-010-055
 C. Get Access
 (1)
 Put the access platform in position below the APU compartment.

 (2)
 Open the APU access door 315AL.

 (3) Open the access door 314AR.
 _________

4. Procedure
 Subtask 26-22-00-210-058
 A. Inspection of the APU Fire-Extinguishing Distribution Piping
 (1)
 Get access through door 314AR.

 (a)
 Examine the fire-extinguisher discharge pipe, the connections, and the discharge nozzle for distortion, cracks, dents and corrosion.

 (b)
 Examine the support bracket and clamps for distortion, cracks, dents and corrosion.

 (2)
 Get access through door 315AL.

 (a)
 Examine the discharge nozzle for cracks, corrosion and loose attachment bolts.

 (b)
 Examine the discharge nozzle for blockage.
　
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