Fuel System Flashcards
The T-38C has an independent fuel system for each engine,
interconnected by a _____ crossfeed valve.
DC-operated
Each system (left and right) contains the following: (4)
e. A fuel boost pump which provides fuel under pressure to the engine-driven fuel boost pump during normal operations.
f. A fuel filter system is integrated and a bypass is incorporated into the system to prevent engine flameout due to lack of fuel flow through a clogged filter.
g. A shutoff valve controls fuel flow from the boost pump to the engine. Operation of the shutoff valves is controlled via the associated engine throttle or respective FUEL SHUTOFF switch located on the left subpanel in the FCP.
h. A fuel pressure caution light is provided for each system on the WCA PANEL to alert the aircrew of fuel pressure loss (low fuel level at the boost pump or boost pump failure).
The T-38C is normally refueled by the _____
single-point system
If single-point adapters are not available on ground equipment or if either of the automatic shut- off valves (primary/secondary) are inoperative, the tanks may be refueled _____ through the manual filler caps
manually (over-the-top)
When refueling manually, make sure the ____ system is fueled first to prevent the aircraft from sitting on its tail due to a center of gravity imbalance
left
A single AC-driven fuel _____ in each system supplies fuel under pressure to the ______ fuel pump during normal operation.
boost pump
engine-driven
The left system boost pump is in the inverted flight reservoir of the _____ fuselage cell, and the right system boost pump is in the inverted flight reservoir of the ____ fuselage cell.
forward
aft
Without the aid of the boost pump, each engine can be supplied with fuel by _____ from its respective system.
gravity flow
Normally, sufficient fuel flows by gravity to maintain MAX power from sea level up to approximately ______ feet MSL; however, by specifications, gravity flow is guaranteed only to ______ feet MSL, and flameouts have occurred as low as ______ feet MSL.
25,000
6,000
7,000
Low-pressure lights are only valid indications of boost pump output with crossfeed ____, the corresponding fuel shutoff switch ____, and throttle out of _____.
OFF
NORMAL
OFF
Placing either FUEL SHUTOFF SWITCH to the CLOSED position shuts off fuel flow to the respective engine in approximately ___ second without using the throttles.
1
With the CROSSFEED switch ON and either both boost pumps ON or both boost pumps OFF, a ______ can occur.
rapid fuel imbalance
A FUEL LOW caution light is located on the WCA panel in each cockpit. The caution light illuminates after a ____ delay when a fuel quantity indicator reads below _____.
7.5 s
250 lbs
The fuel quantity indicators should be monitored to maintain the two systems within _____ pounds of each other to ensure the aircraft Center of Gravity (CG) is maintained within limits
200
If the left or right fuel system has less than _____ pounds of fuel, the surface of the fuel falls below the fuel boost pump upper inlet and boost pump output is reduced approximately ____.
650
40%
