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T-38 Systems > SO1112 Fuel System > Flashcards

SO1112 Fuel System Flashcards

1
Q

Left engine is supplied by the left ____ fuel system.

A

forward

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2
Q

Right engine is supplied by the right ____ fuel system.

A

aft

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3
Q

How many fuel cells?

A

5 (rubberized nylon bladders)

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4
Q

Normal refueling method?

A

Single-point

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5
Q

How much less fuel from over-the-top?

A

40 LBS (3866 lbs vs 3906 lbs)

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6
Q

Why should the left (forward) system be filled first with over-the-top?

A

To prevent AC sitting on its tail due to imbalance

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7
Q

How many pounds of fuel in left system?

A

1916

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8
Q

How many pounds of fuel in right system?

A

1990

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9
Q

How many capacitance probes?

A

7

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10
Q

What are the inverted flight reservoir for?

A

Sustaining inverted or negative-G flight.

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11
Q

When will the RCP boost pump light turn on?

A

When the boost pump switches in the FCP are turned OFF

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12
Q

Does the boost pump lights in the RCP turn on in case of a boost pump failure?

A

No

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13
Q

What does the boost pumps do?

A

Provide fuel under pressure top the engine-driven fuel pump.

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14
Q

Will the engine run without the boost pumps?

A

Yes, they will run on gravity feed.

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15
Q

When is the crossfeeding system used?

A

With greater than 200 lbs imbalances (or emergencies)

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16
Q

You can use crossfeeding to transfer fuel from one system to another.

A

False. A check valve will prevent fuel being transferred from one system to another.

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17
Q

What does placing the throttles in OFF do?

A

Shut off the fuel at the main fuel control

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18
Q

A red indicator extended from the fuel drains indicates what?

A

That a fuel bypass has occurred.

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19
Q

Normal fuel pressure?

A

10 PSI

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20
Q

Low fuel pressure caution?

A

Less than 6 PSI

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21
Q

What is the most serious cause for a low fuel pressure caution?

A

A fuel leak - because of risk of flameout

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22
Q

When might the fuel pressure light come on in flt (no malfunction)?

A

After AB is selected

At high PWR settings while crossfeeding

23
Q

Low fuel warning light?

A

Either quantity cage shows below 250 pounds

24
Q

What is the delay for FUEL LOW and why?

A

7.5 sec. Prevents activating WCA in the event of slushing fuel.

25
Q

When will a (white) fuel imbalance show on the EED? When will a red one occur?

A

Between 60-190 pounds.

Red: +200

26
Q

What does a magenta line between fuel bars indicate?

A

Crossfeeding

27
Q

Is fuel flow shown in AB?

A

No not the increased FF.

28
Q

What power (AC/DC) does the fuel flow indicators run on?

A

DC. With out power they will show 0.

29
Q

The engines flameout in case of both boost pumps failing.

A

False. They will gravity feed and keep running under normal conditions at reduced power settings.

30
Q

Gravity flow is normally sufficient to maintain MAX power when?

A

Sea lvl - 25,000 ft (normally)

Sea lvl - 6000 ft (guaranteed)

31
Q

Flameouts have occurred in MAX pwr while gravity feeding as low as ______ feet.

A

7000 (MSL)

32
Q

You should not perform MAX thrust dives with less than ______ pound of fuel in EITHER system.

A

650

33
Q

How much is the boost pump output reduced by when less than 650 pounds in the resevoir?

A

40%

34
Q

MAX thrust flt at 0 or negative G should not exceed what?

A

10 sec at 10000 ft

30 sec at 30000 ft

35
Q

What should you do in case of a fuel low light (nose position).

A

Raise the nose to keep air from entering the system

36
Q

Taxi ops with less than _____ pounds could cause flameouts

A

150

37
Q

You should keep fuel system within how many pounds of each other?

A

200

38
Q

What is the max fuel difference allowed between fuel systems?

A

right (aft) equal more than twice the left (forward)

39
Q

How to even out a fuel imbalance?

A

diff. PWR setting (preffered)

crossfeeding

40
Q

At what fuel states are crossfeeding recommended (CBT)?

A

When imbalance exceeds 200 pounds

41
Q

How to supply maximum amount of fuel to engine (when operating single-engine)?

A

Turn crossfeed on while both boost pumps are on

42
Q

When not to crossfeed?

A 
EED or Fuel quantity fail
Boost pump inop
Fuel leak
Low alt/traffic pattern
Low fuel state with eng running.
43
Q

OFF indications shown on EED at fuel flow and quantity cages indicates what?

A

EED does not receive a sensor input

44
Q

EED FAIL indicates what?

A

Internal EED failure (sensors still good)

45
Q

Thunderstorms will cause the EED fuel quantity to vary as much as with _____ pounds

A

200

46
Q

What will cause a FUEL PRESS light?

A 
A fuel Surge
Low fuel lvl at the boost pump
A partial GEN fail (will likely have other indications too)
Boost pump failure
Fuel Leak
47
Q

If FUEL PRESS light remains on after crossfeed is selected, what is then the cause?

A

Fuel Leak (or sensor malfunction)

48
Q

If FUEL PRESS light remains on after crossfeed is selected, it is most likely a boost pump failure.

A

False. In case of boost pump failure the light should go out.

49
Q

What is the worst low fuel press condition?

A

Fuel leak

50
Q

What is the preferred action with a confirmed fuel leak?

A

Shut affected ENG and boost pump off to prevent fire/EXPLOSION!

51
Q

When throttles are placed OFF, fuel to ENG is _______ shut off at the main fuel control, and also ________ at the fuel shutoff valve.

A

mechanically, electrically

52
Q

What are the only two fuel items powered by the DC system?

A

crossfeed and fuel shutoff valves.

53
Q

How can you check your fuel quantity with a total AC failure (EED out)

A

The static inverter

54
Q

With an internal EED failure that affects the fuel gages, the normal white bar on the vertical scale is ________

A

blanked

T-38 Systems (9 decks)

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