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M11 new josh > 11.10 fuel systems > Flashcards

11.10 fuel systems Flashcards

1
Q

what do aircraft fuel systems do

A

store and deliver correct fuel quantities

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2
Q

what must the fuel system provide

A

positive and reliable flow free of contamination

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3
Q

what is in the tank to collect contaminants and where in the tank is it

A

sump and drain at the lowest point in the tank

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4
Q

what are aircraft fitted to ensure they can land at a safe load if theres left over fuel

A

jettison valve

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5
Q

what are trim fuel tanks

A

fuel tanks located in trim tabs

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6
Q

whats the function of wing tip vent/surge tanks

A

ensure the fuel tanks are well ventilated

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7
Q

what 2 types of aircraft fuel line can there be

A

flexible or rigid

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8
Q

what are rigid fuel lines often made of

A

stainless steel or aluminium alloy

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9
Q

what fittings are used on rigid lines

A

military standard, navy standard

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10
Q

whats the material of the fuel lines used in engine compartments and why

A

stainless steel, susceptible to debris, abrasion and heat

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11
Q

where are flexible fuel lines used

A

areas of vibration

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12
Q

if a fuel line fitting is found leaking what must first be done

A

fitting must be re-tightened to the correct torque

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13
Q

what must all metal fuel lines be

A

electrically bonded and grounded to the aircraft

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14
Q

what are the 2 basic fuel types

A

reciprocating engine fuel (AVGAS), turbine engine fuel (jet fuel)

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15
Q

what is AVGAS made from and the process to get it

A

crude oil, fractional distillation

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16
Q

what are the 3 types of turbine engine fuel

A

jet A1, jet A, jet B

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17
Q

whats the density of jet A1 and jet A

A

0.81kg/litre

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18
Q

whats the freezing point of jet A

A

-40 degrees celcius

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19
Q

whats the freezing point of jet A1

A

-47 degrees celcius

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20
Q

whats the fash point range for jet A and jet A1

A

43-65 degrees celcius

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21
Q

whats the freezing point of jet B

A

-50 degrees celcius

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22
Q

why are dyes used in fuel

A

identify fuel type

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23
Q

are jet fuels dyed

A

no

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24
Q

what colour are jet fuels

A

colourless

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25
what do integral fuel tanks provide
greatest space volume at lowest weight
26
whats the most common place for integral fuel tanks
wings
27
what do integral fuel tanks use to stop the fuel moving around in flight
baffles
28
what do baffle check valves do in integral fuel tanks
let fuel move inboard but prevent it moving outboard
29
whats the function of nitrogen generating systems
improve safety by reducing risk of fuel tank explosions
30
what is NEA
nitrogen enriched air
31
what two ways does the nitrogen supply system operate
low flow, high flow
32
when is the low flow nitrogen used
after takeoff, during climb, cruise
33
what can a fuel leak be repaired replacing
gasket or seal
34
what are the 4 classifications of fuel leaks
stain, seep, heavy seep, running leak
35
what size is considered a stain fuel leak
3/4 inch
36
what size is considered a seep fuel leak
3/4 - 1.5 inches
37
what size is considered a heavy seep fuel leak
1.5 - 4 inches
38
what size of leak is a running leak
puddle of dropping from part of the system
39
what does the SFAR 88 state
permanent safety of fuel tanks from the aircraft and component manufacturers
40
whats CDCCL
critical design control configuration limitations
41
before entering any fuel tank what must happen
drained and purged
42
what 2 people must there be when entering fuel tanks
fuel take entrant, standby person
43
theres air supplies for the fuel tank entrant and standby person, whats the minimum air supply per person
170 l/min
44
when are gravity fuel feed systems use
when the wings are higher than the engine
45
what aircraft cannot use gravity fuel systems
low wing aircraft
46
what type of fuel supply system do low wing aircraft use
pump system
47
what type of aircraft use injection fuel systems
high wing, single engine
48
what are the 5 subsystems of jet engine fuel supply systems
storage, vent, distribution, feed, indicating
49
whats the most common type of fuel pump on large high performance aircraft
centrifugal pump
50
where are centrifugal pumps located
in the fuel tank
51
what is used to remove foreign objects from the fuel
filters or mesh
52
what are the 2 major types of weight limit that aircraft shouldnt exceed
maximum takeoff, maximum landing
53
what does the dumping/jettison system allow the crew to do
dumb fuel overboard to prevent exceeding maximum landing weight
54
what does the jettison system ensure
you can dump fuel but ensures enough is kept for a go around
55
what are fuel vent systems designed to do
prevent build up of pressure in the fuel tanks
56
what are surge tanks used for
overflow fuel and prevent fuel spillage when fuelling aircraft
57
are surge tanks used for fuel storage
no
58
whats the function of flapper valves
prevent fuel traveling outboard during manoeuvres
59
for safety are drain valves operated manually or automatically
manually
60
what does the fuel transfer system allow
movement of fuel between tanks
61
when can the defuel valve be opened
only on ground
62
what do the fuel indicating systems on aircraft monitor
current conditions, unsatisfactory conditions
63
how many fuel flow indicators are there per engine
1
64
where is the fuel temp sensor usually located
main fuel tank
65
where are low fuel pressure sensors located
boost pump outlet line
66
what fuel quantity system do large and high performance aircraft employ
electronic fuel quantity systems
67
what is a capacitor
device that stores electricity
68
how many concentric plates are there per fuel tank
2
69
what is used to manually check fuel level on aircraft
measuring sticks
70
what different types of warning can there be on aircraft
visual, audible
71
with fuel transfer valves what light shows with abnormal fligtht conditions
light dim
72
with fuel transfer valves what light shows with transit
light bright
73
with fuel transfer valves what light shows with normal flight condition
light off
74
where are all the indicators shown
glass cockpit display
75
what are the 2 ways we can refuel
gravity, pressure
76
what is the most common method of refuelling an aircraft
pressure
77
where is the refuelling control panell
leading edge of wing
78
what do refuelling couplings have to protect them from dity
caps
79
what are the 3 modes of pressure refuelling
manual, automatic, override
80
describe manual refuelling
calculate fuel distribution
81
describe automatic refuelling
computer takes pre selection loads and calculates distribution
82
describe override refuelling
no electrical power to refuelling valves available
83
what part of the wing are refuelling valves generally attached to
front or rear spar
84
are solenoid operated refuelling valves fail safe
yes
85
what happens when power is disconnected from solenoid operated refuelling vales
valve closes
86
what are the 2 methods for defueling aircraft
pressure, suction
87
whats the minimum suction required for suction defueling
10-15 psi
88
what psi is used for pressure defueling
25-50 psi
89
does suction defueling need aircraft power
no
90
how big is the fuelling zone
6m (20ft)
91
how far out must no smoking signs be when fuelling
15m (50ft)
92
what does longitudinal static stability depend on
location of centre of gravity
93
what helps longitudinal balance when the plane if flying and using fuel
trim tabs

M11 new josh (23 decks)

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