Fuel System Flashcards
Fuel System Description
Number of integral fuel tanks designated as___
2, No.1 and No.2
Fuel System Description
Each wing tank is divided into___ sections: Name them
3, Surge bay, Main tank and Collector bay
Fuel System Description
This Tank supplies fuel to the LEFT engine AND the APU
Left tank
Fuel System Description
This tank supplies fuel to the RIGHT engine
Right tank
Fuel System Description
Only this type of transfer is possible and is there engine x-feed capability
tank to tank, there is NO engine crossfeed capability
Tanks - Surge Bay
Used for
main tank venting and fuel recovery which allows for positive pressure in the fuel tanks in flight
Tanks - Surge Bay
What controls the pressure between the related surge bay and main tank?
Two outboard float vent valves and one inboard vent line control the pressure between the related surge bay and main tank
Tanks - Surge Bay
How is each surge bay vented?
Each surge bay is vented through two internal standpipes connected to 2 separate NACA vents on the bottom of the wings
- 1 NACA vent is used for: “Positive Pressure”
- 1 NACA vent is used for :“Fuel Overflow”
Tanks - Surge Bay
How is surge bay fuel used?
Fuel that flows into the surge bay in flight is siphoned back into the main tank as fuel is used and as pressure in the main tank decreases
Main Tanks
Primary purpose is…
Primary purpose of the main tank is to store the majority of the fuel and continuously feed it to the collector bay
Collector Bay
Provides…
provides a steady supply of fuel to the engine regardless of aircraft attitude
Collector Bay
What kind of pump does each contain?
Each collector bay contains a “Primary Ejector Pump”
Collector Bay
What serves as a back up source of boost fuel pressure failure?
Two auxiliary fuel pumps, one mounted on the floor of each collector bay, serve as a backup source of fuel boost pressure (i.e. Primary ejector pump fails
Fuel Quantity
11724 lbs total (5862 lbs per tank)
How many probes in each tank detect fuel quantity?
9 capacitance-type fuel probes in each tank determine the total fuel quantity
“(1) or (2) Tank Fuel Low” caution light illuminates if fuel drops below…
If fuel drops below 305 lbs a “(1) or (2) Tank Fuel Low” caution light illuminates
Fuel Temperature/Indication Readings from which fuel area and located for pilot display…
“Ambient Temperature” of fuel in the LEFT collector bay is shown in digital format (°C) on the MFD Fuel Page, directly below the left fuel quantity gauge
“Engine Inlet temperature” taken from where and displayed where?
“Engine Inlet temperature” of left and right engine fuel (independent)—after it has passed through the Fuel/Oil Heat Exchanger—is shown in digital format just below the related fuel tank quantity at the bottom of the ED
Describe the magnastick location, quantity when full/empty, and authorized use.
(1) Magnastick on the underside of each tank (outboard of the nacelle)
Magnastick readings will indicate:
- Full whenever the tank is more than 700 U.S gallons
- Empty whenever the tank is less than 100 U.S gallons
- NOTE: Not to be used by flight crew, MX ONLY
How can fuel transfer be accomplished?
Fuel can be transferred on the ground or in flight provided that 115-volt variable AC power is available to operate the necessary auxiliary fuel pump (donor pump)
What kind of fuel transfer can be accomplished?
Only tank to tank transfer is possible and there is NO engine crossfeed capability
What is the only way engine fuel shutoff valves can be close?
Only the respective “PULL FUEL/HYD OFF” T-handles in the cockpit will close the respective fuel shutoff valves
Where is refueling and defueling accomplished and how is it powered?
Located in the rear underside of the #2 nacelle
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What is unique about the “FUELING ON” Caution light?
“FUELING ON” Caution light (CWP) is the ONLY caution light that is not accompanied by the illumination of the “MASTER CAUTION” light (glareshield panel)
