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T-38 Cards > Systems - Fuel > Flashcards

Systems - Fuel Flashcards

1
Q

General

A
  • Independent Fuel System for Each Engine
  • Five Bladder Fuel Cells
  • Left Engine – Forward Fuselage and Dorsal Cells
  • Right Engine – Center and Aft Fuselage Cells
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2
Q

Total Fuel

A

3906 lbs

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3
Q

Left Fuel

A

1916 lbs

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4
Q

Right Fuel

A

1990 lbs

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5
Q

Refueling (2 methods)

A
  • Single Point Refueling – Refuels Both Systems Simultaneously
  • Over-the-Top Refueling – Both Systems Separate
    • 60lbs Less of Usable Fuel When Refueled
    • Must Fill Left Tank First
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6
Q

How are fuel boost pumps powered?

A

AC Powered, Supplies Fuel Under Low Pressure to the Engine-Driven Fuel Pump

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7
Q

Gravity Feed Can Maintain Fuel For MAX Power Up to

A

25,000 ft

Guaranteed Only to 6,000ft (Flameouts Have Occurred at 7,000ft)

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8
Q

Are engine-driven boost pumps necessary for engine operation?

A

Yes

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9
Q

Boost Pump Switches Only Accessible From the ___ (Lights in ___)

A

FCP, RCP

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10
Q

Two Fuel Low Pressure Lights in Both Cockpits

A
  • Crossfeed Off – Indicates Boost Pump Failure
  • Crossfeed On – Indicates Possible Fuel Leak
  • Blinking is Not an Indication of Boost Pump Failure (Occurs When Using AB)
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11
Q

Fuel Pressure Switches

A

Determine If Engine Driven Boost Pumps are Providing Adequate Pressure

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12
Q

Fuel Shutoff Switches

A
  • DC Operated (Left Essential)
  • Fuel Shutoff Valves are Normally Operated by the Throttles (Switches Can Be Used)
  • Shuts Off Fuel Flow to the Engine in Approximately 1 Second
  • Switches Only Used in Emergency, May Damage Engine-Driven Fuel Pumps and Main Fuel Control
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13
Q

How is fuel crossfeed powered?

A

DC

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14
Q

Fuel crossfeed corrects imbalances of

A

200 lbs or more

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15
Q

ON position operates

A

Both Engines From One Fuel System With the Boost Pump Operating

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16
Q

With Crossfeed ON Ensure

A

One Boost Pump is Operational and One is Turned Off (Rapid Fuel Imbalance Otherwise)

17
Q

If Crossfeed Operation is Continued Until the Active System Runs Dry

A

Dual Engine Flameout Occurs

18
Q

During Crossfeed, If Using a High Power Setting

A

Low Pressure Light May Illuminate and Engine RPM Fluctuations May Occur Because of Insufficient Fuel Pressure

19
Q

Do Not Crossfeed When

A
  • Boost Pump Failure
  • Indicator Malfunction (Fuel Quantity)
  • Leak
  • Low Altitude (2 Engines)
  • Low Fuel (2 Engines)
20
Q

Does fuel flow read for the AB?

A

No

21
Q

How many probes for fuel quantity?

A

7 (AC powered)

22
Q

Red Bar if Fuel Drops Below

A

250 ±25lbs in EITHER System >7.5 Seconds

23
Q

FUEL LOW Light Illuminates When

A

Red Bar Appears (Not Connected to Fuel System, Only to Gage)

24
Q

If Indicator (AC) is Lost or EED (DC) is Lost

A

Warning System is Lost

25
Q

Fuel Imbalance Indications

A

10lb Increments Under the Bar With the Greater Fuel (Maximum of 910lbs)

  • 0-50lbs – No Display;
  • 60-200lbs – White Display; - >200lbs – Red Display
  • Maximum Imbalance Indications 910lbs
26
Q

Fuel Quantity May be Checked with AC Failure b

A

Engaging Static Inverter

27
Q

Low Fuel Precautions: When Solo, Ensure

A

Right Does Not Equal Twice the Left System (CG Out of Limits)

28
Q

Low Fuel Precautions: Maintain Positive Pitch

A

With the Fuel Low Caution Light Illuminated (Precludes Uncovering Boost Pump Inlets and Cavitation)

29
Q

Low Fuel Precautions: Below 650lbs in Either System

A

Upper Inlet of Boost Pump is Uncovered Causing 40% Reduction in Output

30
Q

Low Fuel Precautions: During Low Fuel States (250 ±25lbs)

A

Do Not Use Crossfeed With Both Boost Pumps Operating as Dual Engine Flameout May Occur (There is No Cockpit Indication of Boost Pump Failure in this Situation)

31
Q

Low Fuel Precautions: During SE and Low Fuel Operation

A

Leave Both Boost Pumps and Crossfeed On (Prevents Engine Flameout)

32
Q

Low Fuel Precautions: Avoid MAX Thrust Dives With Less Than

A

650lbs in Either Fuel Tank

33
Q

Low Fuel Precautions: Fuel Imbalance Must be Maintained Within

A

200lbs to Ensure CG Remains Within Limits

34
Q

Prevention of Fuel Starvation

A

Avoid MAX Thrust in 0 or – G Flight Exceeding

  • 10 Seconds – 10,000ft
  • 30 Seconds – 30,000ft

T-38 Cards (3 decks)

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