Fuel System Flashcards
Trapped fuel weight:
Is included in the aircraft basic weight for airplanes certified in the U.S.
With exception of the FUEL JTSN lights, all other Amber lights on the fuel control panel, when illuminated steady, indicate that the respective:
Valve position disagrees with the switch
The red LOW FUEL light illuminates when
400 to 500 lb remains in either wing
The standby pumps are used for all the following functions except:
Wing-to-wing crossflow with a wing tank jet pump inoperative
The crossflow valve opens:
Whenever the CROSS FLOW, XFER-FILL, or FUS VALVE switches are moved from the OFF or CLOSE position
Steady illumination of an amber transfer valve light indicates:
The valve failed to move to the position commanded by the XFER-FILL switch
(i.e. disagreement)
Illumination of the red L or R FUEL PRESS light indicates:
Fuel pressure to the respective engine-driven fuel pump is low
When the XFER-FILL switch is placed to the FILL position, the:
Crossflow valve opens
Motive-flow fuel for the jet pumps is supplied by:
Engine-driven fuel pumps
The amber FUEL Filter light indicates:
That one or both fuel filters are being bypassed
The amount of fuel trapped in the fuselage tank after completion of gravity transfer vis the fuselage valve is approximately:
162 lb (24.3 gallons)
The wing fuel pressure switch:
Turns off the fuselage transfer pump when wing fuel pressure reaches 5 psi
When using any mixture of aviation gasoline:
- Do not take off with fuel temperature lower than -54C (-65F)
- Restrict flights to below 15,000 ft
- Both jet pumps and both standby pumps must be on and the pumps must be operating
The Learjet 35/36 requires anti-icing additive:
At all times
Maximum demonstrated fuel imbalance is:
600 lb tip tanks
Max Usable Fuel
Total:
Fuselage Tank:
Tip Tanks:
Wing Tanks :
Total: 6,238
Fuselage Tank: 1,340
Tip Tanks: 1175 / right and 1215 left - 2390 total
Wing Tanks : 1254 / side - 2508 total
Max Tip tank fuel for landing
925 lbs.
Do not energize fuselage transfer system when
wing and tip tanks are full
Can you cross flow with wing jet pump inoperative?
No, do not do it.
How long does it take to Jettison Full Tip Tanks ?
approximately 5 minutes
Time to reduce from Max takeoff wt. to max. landing weight is approximately:
40 minutes
Max Altitude or suction feed (red FUEL PRESS light illuminated)
25,000 feet.
Refueling Considerations:
Fuel flow for proper PRIST mixing:
Max/Min fuel per 20oz. can of PRIST:
Max Tip Tank imbalance during refueling:
Fuel flow for proper PRIST mixing: 30-60 GPM
Max/Min fuel per 20oz. can of PRIST: (Check Fuel Addenda)
Max Tip Tank imbalance during refueling:
Approximately how much unusable fuel is in the fuselage tank using alternate transfer (gravity method)
162 lbs.