Fuel System

Question 1

The F-16 has ___ internal tanks ___ external tanks, ___ reservoir tanks that _____, and ____ remaining internal tanks that feed the ______

Answer 1

7 internal ; 3 external ; 2 reservoir feed the engine ; 5 remaining that feed the reservoirs

Question 2

Left/AFT tank system includes:

Answer 2

aft tank reservoir (480 lbs)
a-1 tank (2330 lbs)
left internal tank (550 lbs)
3360 lbs total

Question 3

Right/Forward tank system includes:

Answer 3

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

Question 4

left/aft and right/forward needle does not include

Answer 4

internal wing fuel

Question 5

external tank capacity (L/R)

centerline tank capacity

Answer 5

2420 lbs - external
1890 lbs - centerline
6730 lbs total

Question 6

total fuel capacities

Answer 6

13890 lbs - total
total fuselage-6060lbs
internal wings-1100lbs
centerline tank-1890lbs
external wings-4840lbs

Question 7

FUEL TEST POSITION:

Answer 7

AL/FR go to 2000 +/-100lbs
Totalizer goes to 6000 +/-100lbs
both caution lights illuminate

Question 8

4 reasons to be in NORM

Answer 8

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

Question 9

FUEL LOW caution light

Answer 9

AFT FUEL LOW <250lbs
FWD FUEL LOW<400 LBS
independent of fuel quantity indicating system

Question 10

Home Fuel Warning when:

Answer 10

predicted fuel quantity at home point <800 lbs

when this happens - 4 modes from the CRUS 5 page

Question 11

TRP FUEL and FUEL flash in HUD when 5 conditions occur

Answer 11

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

Question 12

False TRP FUEL may occur if:

Answer 12

fuel leak exceeds transfer rate of external tanks
prolonged AB use
receiving partial fuel load during AR with external tank

Question 13

primary method for fuel transfer

Answer 13

siphoning - caused by lower pressure in tanks receiving fuel

Question 14

____ air pressurizes external fuel tanks

Answer 14

ECS (environmental control system) and powers the air ejector pumps

Question 15

fuel flow

Answer 15

left external - left internal - A-1

right external - right internal - F-1 - F-2

Question 16

secondary method for fuel transfer

Answer 16

powered fuel transfer

Question 17

fuel pumps

Answer 17

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

Question 18

maximum fuel transfer rates

Answer 18

18,000 pph centerline

30,000 pph wing tanks

Question 19

internal wing transfer pump max rate

Answer 19

6000 pph

>6000 pph deplete fuselage fuel

Question 20

NORM EXT FUEL TRANS Switch flow

Answer 20

External centerline to both internal wing tanks, then external wing tanks to respective internal wing tanks

Question 21

Automatic forward fuel transfer system operates when:

Answer 21

FUEL QTY SEL in NORM
total forward fuselage fuel quantity <2800 lbs
starts when differential <300, stops when reaches 450 lbs

Question 22

Aerial refueling, system _ provides pressure for ____ and _____

Answer 22

System B ; slipway door and refueling probe latch mechanism

Question 23

lights for AR

Answer 23

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

Question 24

AR switch - OPEN:

Answer 24

external tanks are depressurized
external fuel does not transfer
FLCS is placed in takeoff and landing gains

Question 25

AR: what prevents overfilling?

Answer 25

external tank fuel transfer valve and float switch

Question 26

after disconnect the AR system recycles and the RDY light comes on after ______

Answer 26

3 seconds

Question 27

Fuel tank explosion suppression system:

Answer 27

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

Question 28

Fuel Difference between F-16C/D

Answer 28

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

Question 29

Forward fuselage indication difference between F-16C/D

Answer 29

C: indication based on 2800lbs forward heavu start-300 stop-450
D: indication based on 1500 lbs aft heavy start-900lbs stop-750 lbs

Question 30

FWD/AFT FUEL LOW difference between F-16C/D

Answer 30

FWD: C(400lbs) D(250lbs)
AFT: C(250lbs) D(400lbs)

Question 31

Fuel Supply flow from reservoir

Answer 31

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)