Chapter 15 - Aircraft Fuel Systems - Oral Questions Flashcards

1
Q

Why do some aircraft have fuel jettison systems?

A

To allow the crew to reduce the weight of the aircraft down to or below the max allowable landing weight

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2
Q

Is there any reason why a fuel jettison system might be required on a small aircraft?

A

Yes, if the max takeoff weight is greater than max allowable landing weight

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3
Q

What are some other names for a single-point fueling system?

A

Underwing or

pressure fueling system

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4
Q

Why do multi-engine airplanes have fuel crossfeed systems?

A

To allow any engine to draw fuel from any tank

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5
Q

The fuel selector valve for a multi-engine aircraft must have at least 3 positions, what are they?

A

On,

Off,

Crossfeed

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6
Q

Why do some tanks have internal baffles?

A

To resist fuel surging or sloshing caused by changes in the attitude of the aircraft

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7
Q

What are the two types of fuel cells?

A

Integral (wet wing) and bladder

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8
Q

What does “wet-wing” mean?

A

Sealed portions of the aircraft wing structure form the fuel tanks

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9
Q

How is the weight of the fuel supported when the bladder type fuel cells are used?

A

Bladder is supported by the aircraft structure that supports it

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10
Q

Why do turbine engine aircraft have fuel temp indicating systems?

A

To allow the crew to determine if the fuel is cold enough to form ice crystals

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11
Q

Name four types of fuel quantity gauges currently in use

A

Sight gauges,

mechanical,

electric, and

electronic

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12
Q

Why are electronic (capacitance type) fuel quantity indicating systems more accurate than other types?

A

They measure the mass of the fuel instead of the volume

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13
Q

What are drip gauges and sight gauges?

A

Underwing, bayonet-type fuel gauges

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14
Q

What is the purpose of an in-transit light associated with an electrically operated fuel tank shutoff valve?

A

To indicate that the valve is in motion between one position and another.

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15
Q

For what reason is a fuel jettison system usually divided into two separate, independent systems?

A

To help maintain lateral stability by jettisoning fuel from a heavy wing if necessary

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16
Q

What procedures should be followed regarding gaskets and seals when replacing fuel system components?

A

All old gaskets should be replaced with new ones

17
Q

Is it possible for a fuel system to develop a leak that has no visible evidence such as a stain or spot, and if so, how?

A

Yes, an internal component such as a valve could develop a leak

18
Q

How is a fuel tank checked for leaks following a patch or welded repair?

A

The tank is slightly pressurized with air and the repaired area is leak checked with a soap and water solution

19
Q

Name some advantages of a single point fueling system

A

It reduces fueling time,

reduces chances for contamination and fire, and

eliminates damage to the aircraft skin

20
Q

Why should you wait for a period of time after fueling an aircraft before checking the fuel sumps?

A

To allow time for water and contaminants to settle to the drain point