PC12 Fuel Accident Senario
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Transcript of PC12 Fuel Accident Senario
1
Office of Aviation Safety
PC-12 Fuel System
Airworthiness presentation
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Right Fuel Tank
Left Fuel Tank
To Engine
Fuel System Delivery Fuel Pump
Delivery Fuel Pump
To Engine
R
L
Fuel System
Check Valve
Check Valve
To Engine
R
L
Fuel System
Fuel Filter
Bypass Valve
To Engine
R
L
Fuel System
Engine-Driven Fuel Pump
To Engine
R
L
Fuel System
Fuel Supply
Fuel Return
To Engine
Fuel System
Fuel Boost Pumps
Check Valves
To Engine
Fuel Low Pressure
To Engine
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Fuel Low Pressure
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Fuel Low Pressure
Fuel Quantity Imbalance
To Engine
Fuel Quantity Imbalance
To Engine
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Accident Scenario• Low fuel pressure 1 hour 13 minutes
into flight• Corrected through fuel boost pump
operation• No fuel pressure cautions• Annunciations first indications of
anomaly
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Accident Scenario
• Lack of FSII• Ice accumulation• Ice/water might have been found if
pilot performed preflight inspection
• Low pressure state• Described in checklist• Occurred on previous flights
Flight Time - 1 Hour 13 Minutes
To Engine
Flight Time – 1 Hour 18 Minutes
To Engine
Flight Time - 1 Hour 21 Minutes
To Engine
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Accident Scenario• Performance of fuel system
degraded over time, resulting in significant fuel imbalance
• If pilot had added FSII, low pressure state and subsequent imbalance would not have developed
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Accident Scenario• By 1 hour 52 minutes, imbalance
about 25% of one tank’s capacity• Pilot likely recognized fuel
imbalance before this point• Pilot attempted to manually balance
fuel through activation of left boost pump
• Similar actions observed later in flight
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Flight Time - 2 Hours 17 Minutes
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Safety Issues• Fuel filler placards not required to
advise necessity for FSII• FAA guidance on fuel system icing
prevention does not include information on need for FSIIs
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