Airframe Chapter 15 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 maximum 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 maximum takeoff weight exceeds the maximum allowable landing weight, a jettison system would be required.

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3
Q

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

A

An underwing or pressure fueling system.

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4
Q

Why do multi engine airplanes have fuel cross feed 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 three positions. What are they?

A

On, off, cross feed.

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6
Q

Why do some fuel 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 or wet wing fuel cells, and bladder type fuel cells.

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8
Q

What does the term “wet wing” mean?

A

It means that 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 bladder type fuel cells are used?

A

The bladder is supported by the aircraft structure which contains it.

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10
Q

Why do turbine engine aircraft have fuel temperature indicating systems?

A

To allow the crew to determine if the fuel is cold enough to produce a danger of the formation of ice crystals.

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11
Q

Name the four types of fuel quantity gauging systems currently in use.

A

Sight gauges, mechanical, electric, and electronic gauges.

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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 provide an indication 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, one for each wing?

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 and seals 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 strain or spot, and if so, how?

A

A 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

If 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.