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AGK Systems > Fuel System > Flashcards

Fuel System Flashcards

1
Q

What is the purpose of an aircraft fuel system?

A

Supply the main aircraft engines with sufficient fuel at a given pressure, under all operating conditions.

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2
Q

Different types of tanks

A

Integral, flexible/bag, rigid/drum/fabricated.

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3
Q

Disadvantage of the rigid tank

A

Adds significant weight to the aircraft.

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4
Q

AVGAS 100LL

A

Blue, 0.72, low lead.

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5
Q

AVGAS 100

A

Green, 0.72, high lead

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6
Q

AVGAS80

A

Red.

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7
Q

FSII Icing Inhibitor

A

Suppresses fungal growth, and prevents icing

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8
Q

Where is the fuel flow measurement carried out?

A

After the high pressure valve

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9
Q

Which has a lower freezing temperature, and a lower flashpoint between Jet A and Jet B?

A

The freezing point for Jet A is at a higher temperature than that for Jet B.

The flash point for Jet A is at a higher temperature than that for Jet B.

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10
Q

The correct order of decreasing freezing points of the three mentioned fuels is:

A

Jet A, Jet A1, Jet B

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11
Q

On most transport aircraft, the low pressure pumps of the fuel system are:

A

Low Pressure Centrifugal Pumps

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12
Q

Role of the Fuel Heating Device

A

Prevent, at low fuel temperature, the risk of ice formation from water contained in the fuel.

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13
Q

What power are the LP Centrifugal Pumps supplied with?

A

Three Phase AC - 115V

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14
Q

Purpose of Baffles in the Wing Tank

A

Restrict unwanted movement of fuel, especially in banking attitudes.

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15
Q

How are fuel tanks pressurised?

A

Ram Air intakes on the underside of the wing.

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16
Q

Fuel Tank Air Pressure is maintained at ambient by:

A

Fuel Vent System

17
Q

Where are fuel heaters located on a jet aeroplane?

A

In the engines, just before the fuel filters.

18
Q

Automatic Fuelling Shutoff Valve

A

Stops fuelling as soon as a predetermined fuel mass./volume is reached inside the tank.

19
Q

Cross-Feed System

A

Transfer fuel from any tank and feed the engine.

Adjusts fuel distribution.

20
Q

Purpose of submerging the booster pumps in fuel

A

Cools them down.

21
Q

Vapour Lock

A

Bubbling of fuel blocking the fuel feed link.

As aircraft fly higher the ambient pressure drops, this allows the fuel to more easily change state from a liquid to a vapour. If fuel changes into a vapour in a pipe, or if vapour enters a pipe, it can create a vapour lock which will reduce or stop the flow of fuel.

22
Q

Functions of a LP Booster Pump

A

Avoid vapour locking, prevent cavitation of the HP Pump

23
Q

Function of the Feed Box

A

Increase the fuel level at the boost pump location

Allows fuel into the box but prevent the fuel flowing out as the aircraft is manoeuvred. This ensures the pump is always submerged in fuel.

24
Q

Integral fuel tanks:

A

Comprise a portion of the aircraft structure which has been sealed to form a fuel tank.

25
Q

Fuel pressure is measured

A

In the line between the booster pump and the engine or at the outlet of the high pressure filter

26
Q

From which tanks can the APU receive fuel?

A

All three tanks.

27
Q

If the AC fuel pumps fail, how can fuel be supplied?

A

Gravity feed

28
Q

Prior to starting, from where would the APU be supplied with fuel?

A

Tank #1 by LP pump

29
Q

When would the Fuel Low Level warning activate?

A

When the fuel is low in any tank that is not expected to empty during flight

30
Q

When using magnetic dipsticks, what else is required?

A

When using magnetic dipsticks to measure the quantity of fuel, what else is needed to establish the fuel quantity?

31
Q

‘Wet wing’ with regards to fuel storage refers to:

A

Integral fuel tanks

32
Q

Given the following parameters, in a capacitance fuel gauge, the correct formula is:

A = area of plates 
D = distance between plates 
E = dielectric permittivity
A

E x A / D

AGK Systems (10 decks)

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