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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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04/08/21

Message Overview:

Message Name:

S/D-NO ACCEL_HUNG START

Message Code:

B3-006353

Associated CAS:

None

Reporting LRU: APU
System Description: 49-00-00
Schematic Diagram: 49-61-00
Wiring Diagram: 49-61-01 Sh 1
49-61-01 Sh 2

Message Description:

Auxiliary Power Unit (APU) protective shutdown - engine failed to accelerate (hung start) at least 0.5% per second for 15 seconds.

Possible Causes:

  • Engine Combustor
  • Engine
  • Battery
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 8
  2. {Term Definitions}

    1. APU-40 XX 352 01 EXCT XXXX-XXXX XTXX-XXXX XXXX-XXXX 352: 23; APU S/D NO ACCEL

Quick Links:

Removal of the Battery AMM 24-32-01-000-801
Installation of the Battery AMM 24-32-01-400-801
Removal of the Fuel Control Unit AMM 49-31-01-000-801
Installation of the Fuel Control Unit AMM 49-31-01-400-801
Removal of the Fuel Solenoid Valve AMM 49-31-09-000-801
Installation of the Fuel Solenoid Valve AMM 49-31-09-400-801
Removal of the Ignition Unit AMM 49-41-01-000-801
Installation of the Ignition Unit AMM 49-41-01-400-801
Removal of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-000-801
Installation of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. This condition could be due to restricted fuel flow, engine flame out of the combustor, mechanical engine failure, or a weak battery.

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