• No Start "Auto Shutdown" Message:
  

  (No Acceleration) Reason-Apu Speed < %7 for 30 seconds.

  • Action #1 = Restart with both A/C battery switches "ON" prior to master switch "ON".
  • Action #2 = Verify APU rotates freely, if so R/R starter motor(8KA).
  • Action #3 = If APU does not rotate freely (independent of the starter motor) R/R APU.
  • General info = If A/C batteries are selected "ON" after the master switch is selected "ON", possible no acceleration auto shutdown can occour, restart with A/C batteries "ON" first.
  
  

  (No Acceleration) Reason-Accel < 0.1-0.5% for 15-60 seconds.

  • Action #1 = Verify APU rotates freely. If so bleed the fuel line and perform a restart.
  • Action #2 = If the auto shut down continues, R/R starter motor(8KA).
  • Action #3 = If the auto shut down continues, R/R the Fuel Control Unit.
  • General info = Subsequent "No Flame" and "Underspeed" auto shut downs can occur if no T/S action is taken.
  • CAUTION: LIMIT APU STARTS TO 3/HR, OTHERWISE STARTER MOTOR DAMAGE CAN OCCUR.
  
  

  No Flame.

  • Action #1 = Bleed the fuel line and preform a restart.
  • Action #2 = If the auto shut down continues R/R Ignition Exciter(P10).
  • General info = Subsequent "No Flame" and "Underspeed" auto shut downs can occur if no T/S action is taken.
  • CAUTION: LIMIT APU STARTS TO 3/HR, OTHERWISE STARTER MOTOR DAMAGE CAN OCCUR.
  
  
  On Speed "Auto Shutdown" Message:
  

  Emergency.

  • Action #1 = Inspect 108VU panel for water ingestion and contamination of "APU EMERGENCY SHUT DOWN" button (1KL). R/R 108VU panel per AIRBUS SB A320-92-1011.
  
  

  Clogged Oil Filter.

  • Action #1 = Inspect mag plug for metal contamination R/R lube and generator filter elements.
  • Action #2 = If auto shut down continues, R/R both differential pressure switches.
  • Action #3 = If metal contanimation found on mag plug and auto shut down continues, R/R APU.
  • General info = Oil brand changes have been linked to filter clogging auto shutdowns. (no adverse inpact to APU).
  
  

  Overtemperature (High temp onspeed or high temp on droop)

  • Action #1 = Most Overtemp auto shut downs are due to E/C-(engine cooling) shroud delamination failures.
  • Action #2 = If shroud is delamed, replace the shroud.
  • Action #3 = If shroud is ok and auto shut downs continue, R/R APU.
  
  

  Low Fuel Pressure.

  • Action #1 = If the fault is in conjunction with an auto shut down(No Flame/No Acceleration/or Underspeed) see ASD T/S recommendations above.
  • Action #2 = If the fault continues however the APU still starts, R/R A/C Fuel Pressure Switch(5030QM).
  • Action #3 = If the fault continues, check for possible defects with the A/C Fuel Pressure Switch (7QC). APU Fuel Pump, or Air Release Valve.
  • CAUTION: LIMIT APU STARTS TO 3/HR, OTHERWISE STARTER MOTOR DAMAGE CAN OCCUR.
  
  
  No, Low, or Fluctuating Bleed Air Pressure:

  No Air.

  • Action #1 = If no APU LRU faults are found in the CFDS, restart APU and verify bleed air operations in ECS 2-Pack mode.
  • Action #2 = If NO AIR continues, R/R A/C Bleed Switch.
  • General info = Most "NO AIR" defects should have a Faulted LRU observed in the CFDS last leg reports.
  
  
  FCN(Fault Code Number) = TSM Task.

  (007, 008, 009, 010)=TSM49-70-00-810-816.
  
  

  (016, 017, 018, 019)=TSM49-00-81-810-853.
  
  

  (026, 027, 028, 029)=TSM49-00-81-810-854.
  
  

  (031)=TSM49-00-81-810-852.
  
  

  (076, 077, 215)=TSM49-00-81-810-835.
  
  

  (079)=TSM49-00-81-810-802/806/813/824/836.
  
  

  (081, 082)=TSM49-00-81-810-858.
  
  

  (083)=TSM49-00-81-810-811/840.
  
  

  (088, 096, 097)=TSM49-00-81-810-861.
  
  

  (089, 091)=TSM49-00-81-810-856.
  
  

  (099, 245)=TSM49-00-81-810-818/820/867.
  
  

  (100)=TSM49-00-81-810-808/822/839.
  
  

  (102)=TSM49-00-81-810-849.
  
  

  (105, 106, 107)=TSM49-00-81-810-807/823/857.
  
  

  (109, 110)=TSM49-00-81-810-851.
  
  

  (113, 114)=TSM49-00-81-810-834.
  
  

  (120)=TSM49-00-81-810-832.
  
  

  (123)=TSM49-00-81-810-831.
  
  

  (128, 146)=TSM49-00-81-810-825.
  
  

  (204)=TSM49-00-81-810-805.
  
  

  (205)=TSM49-00-81-810-810.
  
  

  (206)=TSM49-00-81-810-812.
  
  

  (208)=TSM49-00-81-810-819.
  
  

  (209)=TSM49-00-81-810-821.
  
  

  (211)=TSM49-00-81-810-829.
  
  

  (212)=TSM49-00-81-810-830.
  
  

  (215)=TSM49-00-81-810-835.
  
  

  (216)=TSM49-00-81-810-847.
  
  

  (218)=TSM49-00-81-810-850.
  
  

  (240, 241, 242, 243, 244)=TSM49-00-81-810-821.
  
  
  CFDS Diagram:
  

Training Only