FUEL SYSTEM Flashcards
The fuel storage system is made up of ______________.
Four integral wing fuel tanks.
Each wing contains an __________ and _________tank, separated by_____.
Inner and Outer Tank separated by the landing gear nacelle.
What is the “third” tank in each wing?
- where?
- what does it do?
- aka?
The third tank or collector tank is located in the lowest part of the inboard tank and is where fuel is introduced to the fuel feed system.
What connects the inboard and outboard fuel tanks in each wing (2)?
A rectangular fuel duct.
A vent duct.
What ensures pressure equalization between the outboard and inboard fuel tanks as it is transferred?
The vent duct.
Can you crossfeed fuel in the air?
No, only on the ground from the outside panel.
The APU is normally fed from the fuel system in the _______ wing.
RIGHT WING.
What provides fuel to the engine driven fuel pump?
The electric boost pumps (2 each side, front and rear) and the jet pumps (1 each side, motive flow), located in the fuel tanks.
What is the usable fuel capacity of each wing tank?
437 gallons.
Where are the main jet pumps?
One is located is each collector tank.
What is used to operate the main jet pumps?
‘motive flow’
How would you recognize a loss of motive flow an the main jet pump not operating. (2)
The electric boost pumps cycling on and off (in auto mode) and alternating with “LOW PRESS” light on the overhead fuel panel.
Where are the Transfer Jet Pumps and how many are there?
There are two located in each inboard tank.
What’s the purpose of the Transfer Jet Pumps?
To keep the collector tank full for the main jet pump and electric boost pumps.
What happens to ‘usable fuel’ when the transfer jet pumps are inoperative?
Useable fuel in the corresponding tank is reduced by 12.15 gallons.
What is the Firewall Shutoff Valve?
An electrically actuated gate that stops fuel flow to the engine. (FIRE HANDLE)
What is annunciated when the cross feed valve is opened? (2)
1) white light above the cross feed switch.
2) white light on fuel quantity indicator panel.
What stops working/closes when the cross feed valve is opened and what is done due to this?
(1) both motive flow shutoff valves close.
(2) an electric boost pump must be used.
What is the normal position of the motive flow shutoff valves?
OPEN, they close when cross feeding, blocking fuel to the main and jet transfer pumps.
What happens if the low pressure fuel filter gets clogged?
A bypass valve opens.
What would cause: (1)AMBER filter light on the overhead fuel panel, (2) AMBER ‘FUEL’ light on the MAP, single chime, Master Caution flash?
Indication of an impending bypass at either the low or high pressure filters.
1.5/3.0 psi
25/50 psi
What keeps the fuel in a specific temperature range, what is the target temp?
The fuel heater uses engine oil. Approx 20C.
