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Amount of Usuable Fuel (gallons)
Where can the two boost pumps be found?
The negative g compartment
When does the F PRES caution illuminate?
1) Insufficient px differential across either boost pump
2) Loss of fuel tank px
When do the boost pumps automatically turn on?
Time delay keeps the boost pumps running for how long after any loss of any of the signals?
- 1) During GTS Operation
- 2) When engine speed (N2) is greater than 42%, the generator is ON, and the ENGINE switches are ON
Time Delay: 30 seconds
The FF transmitter is powered by ___________ bus and measures FF prior to the ____________ pump.
28VDC Essential Services Bus
Low Px Fuel Pump
When does the dual datum fuel relief valve open?
1) At 9.5 psi during normal flight
2) At 4.0 psi during refueling or when TAILHOOK is down.
When does the FUEL caution illuminate?
When usuable fuel falls below 350 pounds.
Activation is delayed for 10 seconds to minimize nuisance flickering.
When does the LP PMP caution illuminate?
When fuel px provided by the LP pump falls below 35 psi
What does the FCU do?
The fuel control unit schedule FF according to the selected throttle position and compensates the flow for changes in altitude and airspeed.
Purpose of the shot of fuel solenoid?
Provides increased FF to reduce engine acceleration time and provide improved engine surge control.
75 gallons per hour
Open on the ground and remains open until climbing thru 9,500 +/- 300' MSL. Reopens when descending thru 7,700 +/- 500' MSL.
Open whenever below 7200' MSL.
Manuel Fuel Control
The system bypasses the control elements downstream of the HP pump.
No automatic control of N1 RPM, N2 RPM, or EGT.
All fuel metering to the engine is accomplished by direct movement of the throttle.
Engine Control Amplifier automatically prevents overspeed and overtemp conditions under normal operations
When N1 reaches 100 RPM in correct direction of rotation, signal sent which energizes ignition system and illuminates READY advisory.
Deenergized and READY extinguished when engine reaches 45% RPM.
When does the ECA advisory illuminate?
If a malfunction occurs to one of the electrical circuits (lane 1 or 2) in the ECA
When does the ECA advisory illuminate along with the ECA caution?
If a malfunction occurs to both electrical circuits (lanes 1 and 2) in the ECA
The sub idle fuel control unit meters a fuel supply to the fuel spray nozzles during the starting cycle.
Total fuel capacity (gallons)
Capacity of wing tank (gallons)
Capacity of fuselage tank (gallons)
Amount of unusable/trapped fuel (gallons)
Capacity of collector tank (pounds)
Idle FF (gallons / hour)
Max refueling rate (gallons / minute)
Defueling rate at 11 psi (gallons per minute)
Pressure of engine bleed air supplied for fuel tank pressurization
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