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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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07/06/21

Message Overview:

Message Name:

APU FUEL SMELL IN COCKPIT DURING APU START

Message Code: 493OBS001
Effectivity: All
System: Auxiliary Power Unit (APU) Engine Fuel and Control System
System Description: 49-30-00
Schematic Diagram: 49-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 49-61-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Momentary Fuel smell in the Cockpit and Cabin during Auxiliary Power Unit (APU) start up.

Possible Causes:

None

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Quick Links:

Cleaning of the Auxiliary Power Unit (APU) Combustor AMM 49-21-00-170-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Gas Turbine Auxiliary Power Unit (APU) CMM 49-24-35 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

NOTE: Bombardier request Operators to reports all occurrences of the momentary fuel smell cases in flight or on the ground during spool up. To help the ongoing investigation please provide information to Honeywell Aerospace Technical Support (ATS) help desk and Bombardier local Field Service Representative. All reported cases will be investigated and the findings will be complied to allow the investigation team to gather data in order to improve the troubleshooting guides.

An Advisory committee issue was raised to this effect (49-35-M-1000), ensuring every reported case to be tracked and thoroughly investigated. Preliminary analysis revealed the following potential contributors and associated corrective actions:

  1. Carbon build-up in the combustor:

    • Optional task for combustor wash
    • MPD section 3.2 (AMM task: 49-21-00-170-801)
    • Recommended interval: 1000 APU Hours pre SB RE220-49-7813 and 2000 APU Hours post SB & APU S/N P-286 & sub

  2. Fuel Leakage:

    • Fuel Nozzle/Fuel Control Unit (FCU)/Secondary Flow Divider SOV
    • Fuel draining with APU shutdown or improper fuel metering
    • Ref: CMM 49-24-35, Table 104: Shutdown Plenum Drain leakage limit

  3. Do close out.

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