Fuel System Flashcards
The F-16 has ___ internal tanks ___ external tanks, ___ reservoir tanks that _____, and ____ remaining internal tanks that feed the ______
7 internal ; 3 external ; 2 reservoir feed the engine ; 5 remaining that feed the reservoirs
Left/AFT tank system includes:
aft tank reservoir (480 lbs)
a-1 tank (2330 lbs)
left internal tank (550 lbs)
3360 lbs total
Right/Forward tank system includes:
forward tank reservoir (480 lbs) f-1 tank f-2 tank (f-1 and f-2 = 2770 lbs) right internal tank (550 lbs) 3800 lbs total
left/aft and right/forward needle does not include
internal wing fuel
external tank capacity (L/R)
centerline tank capacity
2420 lbs - external
1890 lbs - centerline
6730 lbs total
total fuel capacities
13890 lbs - total total fuselage-6060lbs internal wings-1100lbs centerline tank-1890lbs external wings-4840lbs
FUEL TEST POSITION:
AL/FR go to 2000 +/-100lbs
Totalizer goes to 6000 +/-100lbs
both caution lights illuminate
4 reasons to be in NORM
easy to monitor (forward normally 0-600 lbs greater than aft tank)
AL/FR needles provide early indication of trapped fuel (if needle moves before totalizer is 6000 lbs - fuel is trapped)
activated automatic forward fuel transfer system
HUD Bingo based on fuselage fuel, not total fuel
FUEL LOW caution light
AFT FUEL LOW <250lbs
FWD FUEL LOW<400 LBS
independent of fuel quantity indicating system
Home Fuel Warning when:
predicted fuel quantity at home point <800 lbs
when this happens - 4 modes from the CRUS 5 page
TRP FUEL and FUEL flash in HUD when 5 conditions occur
FUEL QTY SEL knob in NORM
No AR for 30-90 seconds
fuselage fuel 500lbs less than fuselage capacity for 30 seconds
total fuel at least 500 lbs greater than fuselage fuel for 30 seconds
fuel flow <18,000 pph for 30 seconds
False TRP FUEL may occur if:
fuel leak exceeds transfer rate of external tanks
prolonged AB use
receiving partial fuel load during AR with external tank
primary method for fuel transfer
siphoning - caused by lower pressure in tanks receiving fuel
____ air pressurizes external fuel tanks
ECS (environmental control system) and powers the air ejector pumps
fuel flow
left external - left internal - A-1
right external - right internal - F-1 - F-2
secondary method for fuel transfer
powered fuel transfer
fuel pumps
2 electrically driven transfer pumps in A-1 and F-1
2 fuel driven turbine transfer pumps in internal wings
two fuel driven fuel scavenge pumps in F-2 tank
two boost pumps in forward reservoir
one boost pump in aft reservoir
inoperative with loss of main and standby generators
maximum fuel transfer rates
18,000 pph centerline
30,000 pph wing tanks
internal wing transfer pump max rate
6000 pph
>6000 pph deplete fuselage fuel
NORM EXT FUEL TRANS Switch flow
External centerline to both internal wing tanks, then external wing tanks to respective internal wing tanks
Automatic forward fuel transfer system operates when:
FUEL QTY SEL in NORM
total forward fuselage fuel quantity <2800 lbs
starts when differential <300, stops when reaches 450 lbs
Aerial refueling, system _ provides pressure for ____ and _____
System B ; slipway door and refueling probe latch mechanism
lights for AR
4 lights (two on each side)
AR flood light on top of fuselage centerline aft of canopy
upper leading edge of vertical tail that floods AR receptacle area
AR switch - OPEN:
external tanks are depressurized
external fuel does not transfer
FLCS is placed in takeoff and landing gains
AR: what prevents overfilling?
external tank fuel transfer valve and float switch
after disconnect the AR system recycles and the RDY light comes on after ______
3 seconds
Fuel tank explosion suppression system:
replaces explosive vapors in the tanks, mainly combat and emergencies, 20 seconds of Halon gas used as inerting agent and is released into F-1, A-1, and internal wing tanks
Fuel Difference between F-16C/D
smaller F-1 tank to allow back seat
D~1360 lbs less
C:7160lbs - FR is 0-600 lbs greater than AL
D:5800lbs - AL is 700-1350 lbs greater than FR
Forward fuselage indication difference between F-16C/D
C: indication based on 2800lbs forward heavu start-300 stop-450
D: indication based on 1500 lbs aft heavy start-900lbs stop-750 lbs
FWD/AFT FUEL LOW difference between F-16C/D
FWD: C(400lbs) D(250lbs)
AFT: C(250lbs) D(400lbs)
Fuel Supply flow from reservoir
reservoir –> fuel flow proportioner for balance –> part to JFS part to Fuel/oil heat exchanger –> main fuel shutoff valve –> fuel flow transmitter –> main fuel pump –> (part to main fuel control –> fuel/oil cooler then P&D valve then 16 combuster nozzles) (part to AB fuel pump –> AB fuel control commanded by throttle and DEEC –> AB Spray rings)
