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M11 Aircraft Systems > Fuel > Flashcards

Fuel Flashcards

1
Q

what method refuelling can be done from cockpit

A

automatic pressure refuelling

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2
Q

what does jettison system do

A

dump fuel in case of emergency

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3
Q

what does spring loaded check valve do in regards to fuel

A

keep refuelling hose to 90 degrees

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4
Q

what is present on leak monitor if there’s no leak

A

nothing

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5
Q

freeze and flash point of JET A1

A

38degrees and -47 degrees

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6
Q

What does the Kirt aluminium gasket do

A

Bonding to prevent sparks from static charges

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7
Q

What fuel is most common in Europe

A

Jet A1

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8
Q

Flash point and freezing point of jet a1

A

38 degrees and -47 degrees

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9
Q

Jet a1 American name

A

JP1A

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10
Q

Most common fuel used in America

A

Jet A

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11
Q

Jet A fuel American name

A

JP1

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12
Q

Jet A flash point and freezing point

A

38 degrees and -40 degrees

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13
Q

Problem with flying high and fuel

A

Cause ambient pressure to decrease which causes fuel to vaporise

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14
Q

Jet A and A1 density at 15 degrees

A

0.81kg/ltr

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15
Q

How is water identified in fuel

A

Small droplets or water bubbles or milky appearance - suspended

If dissolved it will be invisible

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16
Q

Problems with water in fuel

A

Ice build up , supports corrosion and erratic fuel quantity indications

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17
Q

Where are fuel tanks located

A

Aircraft wings

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18
Q

Where are vent surge tanks

A

Wing tips

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19
Q

What do vent surge tanks do

A

Make sure fuel is properly vented

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20
Q

Most common fuel tank

A

Integral tank

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21
Q

Advantage of integral tank

A

Save weight because parts of structure used as tank walls

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22
Q

What are auxiliary fuel tanks made of

A

Light metal alloy container
Flexible rubber bladder

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23
Q

What’s used to prevent fuel movement during attitude changes

A

Dampening devices

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24
Q

What’s the purpose of flap baffle check valve

A

Movement in one direction

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25
Where are baffle valves located
Entire length of ribs
26
What does the fuel ventilation system do
Protect aircraft and passengers against dangerous fuel tank vapours
27
What is used to vent stabiliser tank
Ram air
28
How do fuel probes measure fuel
Measuring capacitance in probe
29
System of refuelling from the cockpit
Automatic
30
Type of valve used to prevent leaks
Spring loaded check valve
31
When inspecting fuel leak what will you see if it’s working
Nothing
32
Where is NACA air intake located
Lower wing surface
33
What is flash point
Lowest temp fuel creates enough vapours for it to become inflamed
34
How to detect water in fuel
Syringe test cartridge or filter change colour
35
What do auxiliary tanks do
Tanks in cargo compartment that increase fuel range
36
How do you seal integral tanks
Fillet seal
37
How to aces fuel tanks
Access panels
38
How are fuel tanks ventilated
passing air around the fuel tank, then releasing this air to atmosphere carrying away fuel leaks and vapour
39
Purpose of draining tanks
Remove water or maintenance
40
Two types of drain valve
Direct and indirect
41
Difference between direct and indirect drain valves
Direct installed at lowers point of tanks Indirect is not at lowest point
42
What does water scavenge system do
Removes water collected in tank by sucking into a pump
43
Purpose of fuel tank vent System
Allows air in fuel tank to escape refuelling and air to come in when fuel is being used Protects from over and under pressuring
44
During flight how is air for fuel pressurisation collected
NACA air inlet
45
2 methods of refuelling
Gravity and pressure
46
Disadvantage of gravity refuelling
Takes too long and easy to spill
47
Normal method of refuelling
Pressurised
48
How quick is pressure refilling happening
50 psi
49
Method of pressure refuelling
Manual , auto , override
50
What must be closed to operate refuelling valve switches
Switch guard
51
How does airbus indicate respective tank is full
Blue light
52
When is electrical power for the refuelling system supplied
When panel door is open
53
How is normal refuelling power provided
External power or apu
54
Purpose of overflow sensors or float switches
Detect fuel over spills from tanks
55
When is fuel transfer limited
In flight as it changes aircraft centre of gravity
56
Purpose of fuel scavenge system
Reduce amount of non-usable fuel in tanks
57
Most common method fuel scavenging
Use of jet pumps
58
What can the re circulation system do in regards to engine oil and generator oil
Pumped through engine oil cooler this heats up fuel and cools the engine oil
59
Two methods of defueling
Pressure and suction
60
How do u pressure defuel
Using tank boost pumps
61
Output pressure of boost pumps to defuel
25-50psi
62
How do you suction defuel
Use of a fuel truck / bowser to suck fuel out
63
Minimum suction required for defueling
10-15psi
64
How is fuel transfer done
Only manually
65
What do you need to do after you transfer fuel
Need to balance aircraft after incorrect refuelling or if you need to empty fuel tank for maintenance
66
What are trim tanks used for
Increase effect of an aircraft in flight which reduces fuel consumption
67
How does trim tank fuel save
Reduces aerodynamic drag
68
Who determines centre of gravity
Manufacture at delivery
69
How much is target centre of gravity
2% foward of certified aft limit of aircraft
70
Where is jettison panel located
Overhead panel
71
Two fuel characteristic sensors
Compensator & densitometer
72
Accuracy of fuel quantity
99%
73
What’s used to measure fuel temperature
Thermistor
74
Where is temperature bulb installed
One of the wing tanks at the rear spar
75
What clothing protects against sparks when entering fuel tank
Cotton tank access clothing
76
How is safe to work tank achieved
Sufficient ventilation
77
How many people are required for fuel tank access
2 people or more
78
What’s not equipt with external filler port
Centre and stabiliser thank

M11 Aircraft Systems (23 decks)

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