Fuel System Flashcards
How are the wing tanks formed?
By sealing the major portion of the wing structure
What prevents fuel from moving outboard into the wing?
Flapper valves
How many compartments are there in each wing tank?
Six
Which is the lowest wing fuel tank compartment?
One
What does the number one compartment in each wing tank contain?
An electrical boost pump, two jet pumps, a water drain, and a fuel drain
Where is the ventral tank located?
In the lower part of the aft fuselage
What devices does the ventral tank have?
A water drain and a fuel drain
Where are the surge tanks?
In the wingtips
What does each surge tank incorporate?
A NACA anti-icing flush-mounted ram-air vent assembly on the wing undersurface
To which surge tank does the ventral tank vent?
To the left wing surge tank
What does the surge tank ram-air intake provide?
Slight positive pressure throughout the vent system during flight
What is the usable capacity of each wing tank?
631 US gallons
What is the capacity of the ventral tank?
224 US gallons
What is the total usable fuel?
1,486 gallons or 10,000 lbs
What is the limitation of the ventral tank for flight?
It must be completely full or empty during flight
How do you obtain intermediate fuel loads in the wing tanks?
By manually selecting their refuel valves at the proper level during refueling
How is fuel drawn into each number one tank?
By two jet pumps activated by the respective boost pump
What do the two fuel jet pumps do?
The first draws fuel from the various compartments. The second draws fuel from either the opposite fuel tank or from the ventral tank, depending on the selection of the appropriate transfer valves.
Under normal conditions, what does the electric fuel pump do?
Delivers low pressure fuel via the low pressure fuel cock to the same-side engine
Should both electric fuel pumps fail, how does fuel get to the engines?
Fuel still gravity feeds into each number one compartment. The engine-driven fuel pumps draw fuel for operation by suction feed.
