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Learjet > Learjet 35 PTM Chapter 5 (Fuel System) > Flashcards

Learjet 35 PTM Chapter 5 (Fuel System) Flashcards

1
Q

How many fuel probes are there per wing? Per tip tank?

A

3 per wing / 1 per tip tank

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2
Q

Unusable fuel is included in the _______ _________ ________ and is not reflected in any fuel quantity indication.

A

basic empty weight

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3
Q

Total usable fuel capacity?

A

6,238 lbs

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4
Q

Tip tank capacity (w or w/o recog light)?

A

W/O - 1215 lbs
With - 1175 lbs

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5
Q

What is the maximum amount of fuel that can be in the tip tank for landing?

A

925 lbs

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6
Q

How much fuel does each wing hold?

A

1254 lbs

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7
Q

What are the purpose of flapper valves?

A

They allow fuel to flow freely inboard, but limit outboard flow. Hmm… why would that be important?

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8
Q

What is the minimum required fuel in the wings for T/O or intentional go-around?

A

600 lbs

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9
Q

What is the maximum fuel imbalance when autopilot is engaged? (FC - 530)

A

200 lbs

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10
Q

The fuselage tank is a rubber bladder and can hold _______ lbs of usable fuel.

A

1340 lbs

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11
Q

Let’s say the pressure builds in the wings and tip tank. What is in the tip tank that will allow fuel to drain overboard?

A

Two pressure relief valves. One set at 1.0 psi and the other is set at 1.5 psi in case the first valve fails.

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12
Q

How many fuel probes are there?

A

9
(3 per wing, 1 per tip, and 1 in the fuselage tank)

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13
Q

Which probe contains a temperature compensator that adjust quantity readings for all switch selections for fuel density change due to temperature?

A

The inboard probe in the left wing.

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14
Q

At how many pounds of fuel will the LOW FUEL annunciator illuminate?

A

400-500 lbs

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15
Q

If you are filling the fuselage, and the LOW FUEL light comes on, will the pumps turn off?

A

No. There is no protection here. It is the pilots responsibility to make sure this situation never happens.

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16
Q

Where is fuel flow taken in the fuel system?

A

Just before the spray nozzles

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17
Q

During engine start, at what % N2 does the wing standby pump deenergize?

A

45% - 50%

18
Q

Where do the jet pumps in the tip tank take fuel?

A

They deliver it directly to the inboard baffles where the standby pumps and jet pumps are located in the wing.

19
Q

What do the jet pump switches move?

A

The motive flow valve.

20
Q

What is the maximum demonstrated fuel imbalance for landing?

A

600 lbs

21
Q

How do we know if the jet pump in the tip tank has failed?

A

The only indication is that the wing tank fuel level will start to go down while the tip tank is indicating 600 lbs. (Always make sure to check that the fuel is going down in the tip tank when it gets close to 600 lbs)

22
Q

It is recommended that trapped tip tank fuel be ___________ prior to landing.

A

jettisoned

23
Q

If DC power is lost, what position will be fuel system valves fail to?

A

They will remain in their last position when the power is lost.

24
Q

The fuel pressure needs to drop below ______ PSI for the L or R FUEL PRESS to illuminate. The light will extinguish when the pressure increases above _____ PSI.

A

0.25 PSI, 1.0 PSI

25
Q

The engine driven fuel pump is capable of suction feeding enough fuel to sustain engine operation with both STBY pump and Jet pump inoperative…. However, you need to be at or below __________ ft.

A

25,000 ft

26
Q

A ___ PSI relief valve is Installed in each main fuel line on the engine side of the main shut off valve.

A

75 PSI. The valves vent fuel overboard to relieve pressure buildup caused by thermal expansion of trapped fuel when the engines are shut down.

27
Q

Which fuel sumping point must be sumped before every flight?

A

FUEL VENT DRAIN
If you do not sump the fuel vent drain, it is possible to have a blockage of the fuselage ram-air vent line. This would cause a vacuum to build in the fuselage tank and we would not be able to pump that fuel forward.

28
Q

When does the amber FUEL XFLO annunciator illuminate?

A

Whenever the cross flow valve is fully open.

29
Q

If there is a red FUEL PRESS light illuminated, do not crossflow fuel unless you are below 25,000 feet! What can you do if you are above 25,000 ft to balance fuel?

A

Asymmetric power settings.

30
Q

What is the fuel transfer rate of the standby pump when cross flowing?

A

50 lbs per minute

31
Q

How many pounds of fuel will remain in the fuselage tank when gravity feeding?

A

162 lbs

32
Q

When filling the fuselage tank, a float switch activates when the tank is full. What does the switch cause to happen?

A

1. Illuminates the green FULL light on the fuel control panel.
2. Deenergizes the standby pumps.
3. Closes the transfer and fuselage valves simultaneously, then closes the crossflow valve.

33
Q

When the XFER-FILL switch is in XFER, and the white empty light comes on, it can indicate one of two things...

A
  1. The tank is empty
  2. The fuselage transfer pump has failed.
34
Q

What prevents the transfer pump from over-pressurizing the wings?

A

A wing fuel pressure switch deenergizes the fuselage transfer pump when the wing fuel pressure reaches 5 PSI. The switch resets and energizes the pump again when the pressure drops below 2.5 PSI.

35
Q

There are two one-way pressure relief valves which separates the left and the right wing fuel tanks. Each valve opens at _____ PSID to equalize fuel pressure between the wing tanks when crossflowing or transferring fuel

A

1.0 PSID

36
Q

Fuel transfer should begin only after tip fuel is _____ lbs or less.

A

760 lbs

37
Q

How long does it take for our fuel to be jettisoned from the tip tank?

A

Approximately 5 minutes

38
Q

If you move the fuel jettison switch to “ON” accidentally, can you move it back to off and stop the dumping of fuel?

A

Yes

39
Q

What are the 3 limitations when using AVgas?

A
  1. Altitude restricted to 15,000 ft
  2. Both Jet pumps and STBY pumps stay on the entire time
  3. No more than 500 gallons per 100 hours

BONUS: (No taking off with fuel temps below -54 C)

40
Q

What is the maximum fuel imbalance during refueling? And what would you tell the line guy?

A

125 Gallons. “Fill one side up 125 Gallons, then fill the other wing 250, then 250, then 250, etc…”

Learjet (10 decks)

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