What are the two fuel cells in the Model 407 fuel system used for?
- Transferring fuel between cells
- Supplying fuel to the engine
- Venting fuel cell
- Indicating fuel quantity and low level detection
Each fuel cell has an electrically operated fuel drain solenoid valve and a fuel shut off valve.
What is the combined capacity of the two fuel cells in the Model 407?
130 US gallons (127.8 US gallons usable)
The aft cell has a capacity of 92 gallons, and the forward cell has a capacity of 38 gallons.
What does the gravity transfer line do in the Model 407 fuel system?
Allows fuel to transfer from the aft to forward cell when the aft cell’s fuel level is above the standpipe height
This is one of the two means of transferring fuel between the cells.
What is the purpose of the pressure transfer line in the Model 407 fuel system?
Transfers fuel from the forward transfer pumps to the aft tank
This system includes two electrical pumps mounted to a common sump plate.
What type of fuel cells does the basic aircraft Model 407 have?
Crash resistant bladder type fuel cells
These cells are serviced through a filler port located on the right side of the aircraft.
What is the capacity of the auxiliary fuel tank in the Model 407?
20 gallons U.S. (76 Liters)
The auxiliary tank has no fuel quantity probe or fuel pump.
What do the fuel boost pumps do in the Model 407 fuel system?
Lift all usable fuel past the fuel pressure transducer to the engine
Each boost pump has a pressure switch controlling a caution light on the CWAP.
What is the function of the fuel pressure transducer?
Converts fluid signal into an electrical signal displayed in PSI
It indicates the aft cell boost pump fuel pressure on the Fuel and Amp Gage.
What activates the fuel low caution light in the Model 407?
When approximately 100 ±10 pounds of fuel remain in the aft tank
A float type low-level detector is mounted on the aft fuel cell sump plate.
What is the purpose of the fuel valve in the Model 407?
Controls fuel flow and is electrically operated
A caution light illuminates when the fuel valve is in transit or not fully open/closed.
What does the fuel quantity system do?
Computes fuel weight and displays quantity in pounds
It uses signals from three fuel quantity probes.
True or false: The auxiliary tank installation reduces the baggage compartment maximum load of 250 pounds.
FALSE
The auxiliary tank is mounted to not add additional weight to the baggage floor.
What happens when the forward fuel cell is nearing depletion?
Transfer pumps continue to operate to ensure all fuel is transferred to the aft tank
Time delays are used to control the transfer pumps and caution lights.
What is the function of the fuel drain valves?
Provide a means of draining fuel from both the forward and aft cells
They are electrically operated by switches located aft of the right-side passenger door.
What does the fuel filter do in the Model 407?
Removes impurities from fuel and has a built-in bypass valve
It is equipped with an impending bypass switch connected to a caution light.
What is the capacity of the aft fuel cell in the Model 407?
92 gallons (348 Liters)
It is located underneath and behind the aft passenger seats.
What is the function of the caution lights in the fuel system?
Indicate abnormal operation of related components
They help monitor the status of pumps and valves.
What is the activation condition for the FWD TANK light?
- <25 pounds for 10 consecutive seconds
- <250 pounds for 10 consecutive seconds
- L/FUEL XFR or R/FUEL XFR light illuminated
The table outlines the conditions under which the FWD TANK light activates.
What are the steps to drain a fuel sample from the FUEL SUMP?
- Left and Right FUEL BOOST/XFR circuit breaker switches - OFF
- BATT switch - BATT (ON)
- FUEL VALVE switch - OFF
- PUSH the FUEL CELL DRAIN button(s), drain sample, then release
These steps ensure safe and proper draining of the fuel sample.
What should be done before the first flight of the day regarding the Air Frame Fuel filter?
- FUEL VALVE switch - ON
- Left and Right FUEL BOOST/XFR circuit breaker switches - ON
- Fuel Filter Drain Valve - Open, drain sample, then close
This procedure is crucial for ensuring fuel quality before flight.
What does the fuel filter test button check?
- Press and check FUEL FILTER caution light illuminated
- Release switch and check light extinguished
This test ensures the fuel filter is functioning correctly.
What do fuel flow charts present?
- Aircraft fuel consumption during level flight
- Function of altitude, OAT, airspeed, and gross weight
These charts are based on estimates and limited flight test data.
What is the Long Range Cruise (LRC) airspeed for best fuel economy?
- Solid line labeled LRC indicates optimum airspeed for best fuel economy
LRC is not depicted where it would occur above the continuous transmission limit line.
What is the Maximum Endurance (Max End)?
- Indicates the aircraft gross weight and airspeed relationship for minimum fuel burn
This provides the most time aloft for the aircraft.
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Air Frame26
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Crew Compartment HCR89
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Electrical System14
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B407 Fuel System27
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B407 Engine - RR250/C47B0
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B407 Drive Train & Rotors0
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B407 Flight Controls and Hydraulics0
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B407 Weight & Balance0
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B407 Performance0
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B407 Limitations0
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B407 Component Names0
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B407 Dimensions0
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B407 Emergencies0
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B407 Emergencies0
