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Fuel Systems > Everything > Flashcards

Everything Flashcards

1
Q

Define volatility

A

The tendency of a liquid to vaporize under certain conditions

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2
Q

What are the two forms of water contamination

A

Free water

Dissolved

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3
Q

Describe what dissolved and free water will do to an engine

A

Dissolved water will not effect the engine as most can tolerate it

Free water is a problem and can servely affect engine performance

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4
Q

What do fuels use to reduce risk of water contamination

A

Anti icing additives

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5
Q

Freezing water is a problem in fuel lines. State some methods of reducing this

A

Heating components eg. Filters by compressed air, or oil heating.

Fuel heaters to keep fuel at optimal temperature

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6
Q

State second degree of contamination from water

A

Microbial corrosion in fuel tanks

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7
Q

How can water be detected in a fuel system

A

Taking regular samples from tanks and visually examination for contamination

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8
Q

Name 3 types of fuel tanks

A

Auxiliary
Integral
Bladder/flexible

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9
Q

State the advantage of integral tanks

A

They use maximum space while having the minimum amount of weight

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10
Q

Define a integral fuel tank

A

Primary aircraft structure usually a wing or fuselage which is sealed to contain fuel

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11
Q

Pro of aux tanks

A

Task orientated, therefore they are readily removed or fitted. And can also be jettisoned in emergancys

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12
Q

What material are bladder tanks made from and how are they fitted

A

Neoprene rubber and are stuffed into cavities to then be attached by lacing or snapping into place

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13
Q

Bladder tank inspections

A

For correct fitment/ attachment

Fuel tank integrity

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14
Q

State 2 must haves with a fuel cap

A

Locking device

Chain so not left unattached

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15
Q

Prior to fitting a fuel cap you need…

A

A progressive inspection

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16
Q

Outline the purpose of a surge box

A

To keep fuel from flowing away from booster pump

17
Q

What are baffle plates used for

A

To stop fuel surging in tanks

18
Q

Why do we need ventilation in fuel tanks

A

To avoid catastrophic failure from negative or positive pressure during:
Refuel/defuel
Expansion/contraction (thermal)
Burning fuel during flight

19
Q

Why fuel tanks need drain valves and where are they located

A

For regular inspections of fuel quality and to drain fuel.

Located at sump/lowest part of tank

20
Q

What is the purpose of dumping fuel

A

Incase of emergency landing, need to reduce weight and possibility of fire

21
Q

3 types of fuel indication systems

A

Float
Capacitance
Measuring stick

(Optical is a 4th found on NH90)

22
Q

What fuel indicating system can measure mass

A

Capacitance.

Uses the difference in dielectric values that change the Capacitance to measure quantity

23
Q

State purpose of fuel system

A

To provide a reliable supply of clean duel to the engines to meet their specific requirements

24
Q

3 types of fuel shut off valves

A

Hand operated
Motor operated
Solenoid operated

25
Q

Benefit of solenoid operated fuel valve

A

Extremely fast compared to motor or hand op

26
Q

Purposes of boost pump

A

Provide positive flow of fuel to engine (during start or as a back up to engine driven pump)
Vapor purging
Transferring fuel between tanks

27
Q

Purpose of an agitator

A

To draw tiny bubbles together to make larger bubbles to rise to surface of tanks rather than entering fuel lines

28
Q

FADEC stand for

A

Full authority digital engine control

29
Q

Purpose of a fuel heater

A

To heat fuel to prevent icing of water contaminates

30
Q

Purpose of a fuel strainer

A

To remove contaminates from fuel.

It has a bypass system incase of clogging. Normally indicates to the cockpit and has a visual poppet on the strainer/filter

31
Q

Most common coupling in RNZAF

A

Wiggins coupling

Fuel Systems (1 decks)

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