Fuel System Flashcards
Ground Fuel Schedule
Tank 2 uses fuels until 2,100lbs, then refueled to 2,450lbs by tank 1
When tank 1 reaches 900lbs, it stops transferring to tank 2, which is instead refueled by tank 4
Tank 3 is always refueled by tank 4, which then tank 4 is refueled by the wing tanks
In Flight with External Tanks
External Tank will keep tank 1 nearly full (above 900lbs)
Tank 2 will be between 2,100lbs and 2,450lbs and wings should be nearly full
Tanks 3 & 4 should be full
Fuel Transfer When Externals Empty
Tank 1 will be at 900lbs and cease transferring and remain 900lbs until wings are empty
Tank 2 should be between 2,100-2,450
Tank 3 & 4 Should be full
Tank 4 will supply fuel to both 2 & 3
Tank 4 will be supplied by the wing tanks
Fuel Transfer When Wings Empty
Tank 1& 4 will deplete from 900/3780 lbs at the same ratio, ending with 1 at 250lbs and 4 at 300lbs
Tank 3 will begin to cycle between 2,100-2,450lbs but should never be less than tank 4
LOW FUEL Light
Comes on at 1,125lbs
Fuel System Overview
6 Internal Tanks
- Up to 13,760 lbs
Up to 5 External Tanks
- up to 16,260 lbs (5 wet)
Fuel controlled by Signal Data Computer (SDC) which maintains fuel level to maintain CG and minimize loss of fuel from battle damage
Fuel Tank Quantities
Tank Type Gal JP-5
1 Transfer 212 1440
2 Feed 383 2600
3 Feed 385 2620
4 Transfer 555 3780
L Wing Transfer 244 1660
R Wing Transfer 244 1660
Ext External 480 3260
CL Ext External 473 3220
ARS Refuel
FUEL XFER
Comes on when 350lb imbalance for greater than 15 sec
Fuel Dump
1300 lbs/min
Dumps from tank 1 & 4
Stops when
- Switch off
- Bingo reached
- Tank 1 & 4 empty
- Fuel Low caution (1,125)
External Tank Transfer/Pressurization Off
WonW
Probe Extended
Gear and Hook Down (indicating trap)
External Transfer
Happens when WoffW when bleeds pressurize the tanks
