PTM Ch. 5 Fuel System

Question 1

Useable fuel

Answer 1

648 gal

4342 lbs

Question 2

With boost pumps inoperative, how many many pounds of fuel indicated on the fuel quantity gauge for that tank will be unusable?

Answer 2

75 lbs

Question 3

If the boost pumps are not used or are inoperable, wing dihedral will no longer keep the hopper tank full, if the XFER PUMP caution light comes on, how many pounds of fuel do you have left?

Answer 3

600-700 lbs. 75 lbs will remain in tanks however, that will be unusable.

Question 4

With boost pumps on and XFER PUMP caution light will illuminate with how many pounds of fuel left?

Answer 4

75 lbs or 7.5 min of flight time.

Question 5

If a fuel vent is closed, will fuel still be able to flow on that side?

Answer 5

Yes. The tanks are vented together and the other side will provide ventilation.

Question 6

What prevents fuel from flowing back from hopper tank, forward, and aft collector tanks?

Answer 6

Flapper valves

Question 7

High pressure pump has how much PSI?

Answer 7

980 psi in the engine.

Question 8

How many fuel pumps do we have?

Answer 8

4 per side

2 boost pumps
1 low pressure
1 high pressure

Question 9

How many gal are in hopper tank?

Answer 9

12 gal 81 lbs

Question 10

How many unusable gal in hopper tank?

Answer 10

2 gal per side

Question 11

Each main pump is powered from what essential bus?

Answer 11

It’s respective side’s essential bus.

Question 12

Each Aux pump is powered by what essential bus?

Answer 12

The opposite side essential bus.

Question 13

What controls the XFER PUMP light?

Answer 13

Float switch in the hopper tank

Question 14

Is takeoff allowed with XFER PUMP illuminated?

Answer 14

No.

Question 15

The crossflow line interconnects the left and right what?

Answer 15

Forward collector tanks

Question 16

The motive flow for the crossflow fuel valve?

Answer 16

Electricity.

Question 17

Where is the crossflow fuel valve?

Answer 17

In the crossflow line

Question 18

When is the X-FLOW light illuminated?

Answer 18

When the valve is in motion or is stuck in between open/closed.

Question 19

Max imbalance in Metro 23?

Answer 19

200 lbs

Question 20

Max imbalance with DOWTY props

Answer 20

500 lbs

Question 21

Max imbalance with McCauley props

Answer 21

> 2000 lbs of fuel = 200 lbs

<2000 lbs of fuel = 400 lbs

Question 22

Where is the fuel shutoff valve?

Answer 22

Respective wheel well.

Question 23

When you press the “test button” on the fuel quantity, how much fuel should you see?

Answer 23

1250 lbs. when you release the button they should go back to their respective amounts

Question 24

How to balance fuel in flight:

Answer 24

Enter a slip- light wing down, rudder opposite

Press crossflow button

When tanks are equal press crossflow button again

Release slip when XFLOW is still lit.

Question 25

Each Fuel shutoff valve is powered by what?

Answer 25

It’s respective bus, and will automatically transfer to opposite bus.

Question 26

Max quantity that you can check with Magna stick?

Answer 26

1000 lbs.

Question 27

The fuel pressure gauge indicates fuel pressure between what pumps?

Answer 27

Engine driven low pressure pump and engine driven high pressure pump.

Question 28

What would a zero fuel pressure prior to engine start and a 15 to 20 psi lower than normal with engine in operation indicate?

Answer 28

Inoperative boost pump.

Question 29

How much fuel can you put in before switching to other side?

Answer 29

125 gal