Fuel / Hydraulics / Ice and Rain Flashcards
1
Q
What subsystems does the fuel system usually consist of?
A
Storage and Fuel Ventilation Fuel feed Refueling / Defueling FQIS Fuel Jettison Longitudinal Trim
2
Q
Where are fuel tanks located?
A
Wings, Fuselage and Horizontal Stabilizer
3
Q
Where in a tank would you find fuel sumps and drains?
A
At the lowest point
4
Q
What are tanks fitted with to prevent fuel surges due to altitude change and turns?
A
Baffles
5
Q
What is the most commonly used type of fuel tank on large transport aircraft?
A
Integral
6
Q
What are the most common methods of sealing fuel tank panels?
A
O-Rings and Gaskets
7
Q
Why are fuel tanks ventilated?
A
To prevent structural damage
8
Q
How large must the expansion space of a fuel tank be?
A
Not less than 2% of the tank capacity
9
Q
Why is tank draining carried out?
A
To remove sediment and fuel residue from the tank. Also to remove water from the tanks to prevent freezing.
10
Q
Why is it sometimes necessary to use vacuum apparatus in tank draining?
A
When the drain valve is not located at the tanks lowest point.
11
Q
Why are drain valves fitted with a check valve?
A
It means the assembly can be replaced if leaking without the need of draining the fuel tanks.
12
Q
What is a rule to properly drain any existing water from a fuel tank?
A
The tanks must be left to settle for a certain period of time
13
Q
What sis the main advantage of a ‘fuel pump canister’
A
It can be removed without the need to drain the tanks
14
Q
Which component isolates the engines in the case of engine failure?
A
Low pressure shut off valves
15
Q
In what tanks would you find jet pumps?
A
In vent surge tanks or Centre tanks where no direct fuel feed to the engine takes place.
16
Q
What is the purpose of an Air Release Valve?
A
It releases air trapped in the fuel feed line. Installed at the highest point of the fuel line
17
Q
It is a requirement that fuel can be transferred between tanks. In which cases does this become necessary?
A
If the fuel supply of a main tank to its engine stagnates
18
Q
What is a meant by the term ‘Probe’?
A
A measuring device that consists of 2 concentrically mounted tubes in open connection to the tank. These tubes form the plates of a capacitor.
19
Q
What is the variable in the tank that affects the dielectric constant?
A
The ratio of fuel to air
20
Q
In what case would you use the dipstick method to measure fuel level?
A
When there is no electrical power available
21
Q
The fuel dump system is also called the?
A
Fuel Jettison System
22
Q
What is fuel dump used for in aviation?
A
To bring the aircraft to a safe landing weight or go around weight.
23
Q
What are some warning provided by the fuel system?
A
Tank Level (High and Low), System Components Inop, Fuel Imbalance, Impossible Fuel Transfer.
24
Q
What is the most common type of hydraulic fluid?
A
Skydrol
25
What are the most important systems that Hydraulics supplies?
Flight Controls and Landing Gear
26
Why are Hydraulic tanks pressurized?
To prevent frothing and ensure there is a supply always available.
27
What are the two types of hydraulic accumulators?
Spherical and Piston
28
Main hydraulic pumps are usually of the ............................ type?
Variable Piston Pump
29
What is the purpose of a hydraulic fluid reservoir?
- Have a supply of fluid available
- Absorb differences in level when in use
- Let fluid cool off, settle and release vapor bubbles
30
In depressurized mode the wobble plate is in the ................ position?
Angled
31
What is another name for a maintaining valve?
A priority valve
32
3000psi is equivalent to ........ Bar?
210
33
What is the first component in the pressure line from the EDP?
A switch to warn if pressure is too low
34
Never operate a hydraulic system with pressure released in the ............. ?
reservoir
35
What type of pumps are hydraulic electrical pumps?
Gear type or Variable Piston
36
What two parts does a PTU consist of?
Motor and a Pump
37
How much fluid is transferred when the PTU is in operation?
None
38
When is a PTU is automatic mode?
In flight and on the ground
39
At what percentage roughly are hydraulic pressure relief valves operated?
10-20%
40
What are the two types of hydraulic fluids?
Mineral and Synthetic
41
What fluid is skydrol?
Phosphate ester
42
How is the fluid filter element monitored?
A differential indicator
43
what Colour is the band on a hydraulic seal?
Green
44
At what pressure will a check valve operate?
15-20 PSI
45
What hydraulic parameters are usually indicated in the cockpit?
Temp, Pressure, Output pressure and Quantity
46
What are the effect of ice on the forces of an aircraft?
Drag and Weight increases while Lift and Thrust reduces
47
Frost is removed from an aircraft by spraying it with a mixture of?
Ethylene Glycol + Isopropanol Alcohol
48
What is the purpose of an ice detection spotlight?
To illuminate parts of the aircraft that are prone to icing so the crew can visually monitor it
49
When is it allowed to apply chemical rain repellent to the windshield?
Only when then windshield is wet otherwise it will smear
50
Ice will only form on an aircraft when?
flying through cloud or precipitation where the water droplets are super cooled
51
What type of ice freezes immediately on impact and has a rough and generally opaque formation?
Rime Ice
52
what type of ice takes a while to freeze so contains air bubbles and has time to run back?
Gleam Ice
53
What type of ice forms in the air in small crystals and can cause blocking of intakes in sufficient volume?
Dry Ice
54
What type of ice is cooled slowly and so runs back in a clear smooth fashion?
Clear or Glaze Ice
55
Where is the 'Wheel Base' measured from?
From the centre of the boogie beam from NLG to MLG
56
Where is the 'Wheel Track' measured from?
From the centre of the boogie beam from left to right main landing gear
57
During landing kinetic energy is transferred into?
Heat energy
58
When 4-6 wheels are connected to a landing gear they are connected to?
Boogie beams and gear trucks
59
What is the function of the fluid inside the strut?
Slows down the strut movement during the extension od the shock absorber
60
In what part of the gear would you find fluid and nitrogen?
In the strut combined within the shock absorber
61
What other sub-systems are in the landing gear system?
- The brake system- The NWS system- The flight/ground switching system
62
Is it possible to move the landing gear handle on the ground?
yes
63
How does the emergency landing gear extension system work?
From a handle in the flight deck the gear can be manually unlocked via control cables. Gravity allows the gear to fall and bungee springs hold it in the locked position.
64
What is the purpose of the brake control valve?
The brake control valves control the pressure on the brakes and make sure there is sufficient braking force.
65
For what purpose are flow limiter or fuses responsible in a brake system?
They are used to prevent all brakes from becoming powerless if one of the brakes or brake lines leak. They will shut off further pressure so not all pressure is lost.
66
What is the function of the anti-skid system?
The anti-skid measures the deceleration of the wheels, if the wheels de-accelerate too much then the brake pressure will decrease.
67
Explain how a parking brake works on a typical airliner?
It is done either by pressing pedals all the way down with the help of the parking brake leaver or electrically by opening a valve supporting hyd pressure direct to the brakes.
68
What does shimmy mean?
the undesirable unsteadiness of the gears.
69
What is used to prevent shimmy?
A spring operated accumulator is installed between the torque link assembly.
70
What is the purpose of a ground shift mechanism?
It is a mechanical system to indicate when the aircraft is on the ground or the gear is under pressure
71
What kind of wheel rims are used on an aircraft?
Aluminium alloy rims in the split hub style with an o-ring between to prevent nitrogen leakages.
72
What is meant by re-treading?
Method of restoring a used retreadable tire by renewing the tread alone or by renewing the tread plus the reinforcing ply
73
Where does the centre of gravity lie when the aircraft is on the ground?
Always between the landing gears
74
What is being developed to keep the pressure on the runway as low as possible?
Landing gears are being developed with more and more wheels.
75
Down lock springs are also called?
Bungee Springs
76
What will a brake adjuster do?
Adjust the brakes according to wear
77
What is the advantage of carbon brakes?
They have a constant output whether hot or cold and are not susceptible to thermal shock
78
What is installed to move the rotor vanes of brakes when the wheels are turning?
Splines
79
What mechanism locks the gear when extended?
Over centre links
80
What should be used when inflating a newly fitted tyre?
A safety cage
81
What are the two types of tyres?
Radial and Bias
82
What type of bearings are used in aircraft wheels?
Conical roller bearings
83
What does the amber light on a landing gear panel indicate?
Wheel well doors are not closed
84
What does a light out on the Landing Gear panel mean?
Gear and doors are up and locked closed
85
What does a green light on the Landing Gear panel in the flight deck indicate?
Landing gear is down and locked
86
A valve that allows the Gear Up or Gear Down movement to happen in the right order is?
Sequence Valve
87
When is the nose wheel steerable?
When the nose gear shock absorber is compressed (on the ground)
88
What is the pressure called inside a strut?
Pre-Charge
89
What is the percentage of oxygen in the air?
21%
90
What is the normal way to prevent hypoxia in an aircraft?
Pressurise the cabin
91
Chemical oxygen generator systems are normally provided for?
Passengers in failure of the pressurisation system or insufficient cabin air flow
92
What is the function of the LP supply valve in the crew oxygen system?
To allow of shut off the oxygen control to the distribution manifold
93
How is the crew oxygen cylinder protected from over pressure?
By a rupturing pressure relief valve that releases oxygen overboard through a discharge line
94
The amount of time during which a pilot is able to effectivley or adiquatly fly is aircraft with insufficient oxygen is?
Effective Time Performance
95
Oxygen cylinders can be made from?
Steel, Aluminium or Composites
96
What is the purpose of the crew oxygen pressure regulator?
To step the bottle pressure down from 2200 PSI to around 20-75 PSI
97
The cabin altitude at which masks will be automatically released is?
14000 Feet
98
What is the purpose of a pneumatic isolation valve?
To split OR connect different pneumatic systems
99
Which component is responsible for pneumatic temperature control?
Fan Air Valve - this supplies cool engine air.
100
Where is air taken from to cool the pneumatic air in the heat exchanger?
Fan Cooled Air
101
The over pressure valve protects the users if air is provided from?
The engine HP or LP compressor stage.
102
What is the purpose of the HP control valve?
It is used to determine the source of engine compressor stage
103
Why is important to energise the aircraft prior to pressurising a pneumatic system from external?
Pneumatic systems may start unwanted or unprotected
104
What are pneumatic sources in flight?
Engine and APU
105
Pneumatic operated systems should not be supplied with cold pneumatic air from external, why?
Otherwise icing of valves or turbines may occur
106
In what ways can pneumatic leak detection be carried out?
- Thermal Switches- Manifold failure loops- Pressure switches.
107
Where is the 'Wheel Base' measured from?
From the centre of the boogie beam from NLG to MLG
108
Where is the 'Wheel Track' measured from?
From the centre of the boogie beam from left to right main landing gear
109
During landing kinetic energy is transferred into?
Heat energy
110
When 4-6 wheels are connected to a landing gear they are connected to?
Boogie beams and gear trucks
111
What is the function of the fluid inside the strut?
Slows down the strut movement during the extension od the shock absorber
112
In what part of the gear would you find fluid and nitrogen?
In the strut combined within the shock absorber
113
What other sub-systems are in the landing gear system?
- The brake system- The NWS system- The flight/ground switching system
114
Is it possible to move the landing gear handle on the ground?
yes
115
How does the emergency landing gear extension system work?
From a handle in the flight deck the gear can be manually unlocked via control cables. Gravity allows the gear to fall and bungee springs hold it in the locked position.
116
What is the purpose of the brake control valve?
The brake control valves control the pressure on the brakes and make sure there is sufficient braking force.
117
For what purpose are flow limiter or fuses responsible in a brake system?
They are used to prevent all brakes from becoming powerless if one of the brakes or brake lines leak. They will shut off further pressure so not all pressure is lost.
118
What is the function of the anti-skid system?
The anti-skid measures the deceleration of the wheels, if the wheels de-accelerate too much then the brake pressure will decrease.
119
Explain how a parking brake works on a typical airliner?
It is done either by pressing pedals all the way down with the help of the parking brake leaver or electrically by opening a valve supporting hyd pressure direct to the brakes.
120
What does shimmy mean?
the undesirable unsteadiness of the gears.
121
What is used to prevent shimmy?
A spring operated accumulator is installed between the torque link assembly.
122
What is the purpose of a ground shift mechanism?
It is a mechanical system to indicate when the aircraft is on the ground or the gear is under pressure
123
What kind of wheel rims are used on an aircraft?
Aluminium alloy rims in the split hub style with an o-ring between to prevent nitrogen leakages.
124
What is meant by re-treading?
Method of restoring a used retreadable tire by renewing the tread alone or by renewing the tread plus the reinforcing ply
125
Where does the centre of gravity lie when the aircraft is on the ground?
Always between the landing gears
126
What is being developed to keep the pressure on the runway as low as possible?
Landing gears are being developed with more and more wheels.
127
Down lock springs are also called?
Bungee Springs
128
What will a brake adjuster do?
Adjust the brakes according to wear
129
What is the advantage of carbon brakes?
They have a constant output whether hot or cold and are not susceptible to thermal shock
130
What is installed to move the rotor vanes of brakes when the wheels are turning?
Splines
131
What mechanism locks the gear when extended?
Over centre links
132
What should be used when inflating a newly fitted tyre?
A safety cage
133
What are the two types of tyres?
Radial and Bias
134
What type of bearings are used in aircraft wheels?
Conical roller bearings
135
What does the amber light on a landing gear panel indicate?
Wheel well doors are not closed
136
What does a light out on the Landing Gear panel mean?
Gear and doors are up and locked closed
137
What does a green light on the Landing Gear panel in the flight deck indicate?
Landing gear is down and locked
138
A valve that allows the Gear Up or Gear Down movement to happen in the right order is?
Sequence Valve
139
When is the nose wheel steerable?
When the nose gear shock absorber is compressed (on the ground)
140
What is the pressure called inside a strut?
Pre-Charge
141
What is the percentage of oxygen in the air?
21%
142
What is the normal way to prevent hypoxia in an aircraft?
Pressurise the cabin
143
Chemical oxygen generator systems are normally provided for?
Passengers in failure of the pressurisation system or insufficient cabin air flow
144
What is the function of the LP supply valve in the crew oxygen system?
To allow of shut off the oxygen control to the distribution manifold
145
How is the crew oxygen cylinder protected from over pressure?
By a rupturing pressure relief valve that releases oxygen overboard through a discharge line
146
The amount of time during which a pilot is able to effectivley or adiquatly fly is aircraft with insufficient oxygen is?
Effective Time Performance
147
Oxygen cylinders can be made from?
Steel, Aluminium or Composites
148
What is the purpose of the crew oxygen pressure regulator?
To step the bottle pressure down from 2200 PSI to around 20-75 PSI
149
The cabin altitude at which masks will be automatically released is?
14000 Feet
150
What is the purpose of a pneumatic isolation valve?
To split OR connect different pneumatic systems
151
Which component is responsible for pneumatic temperature control?
Fan Air Valve - this supplies cool engine air.
152
Where is air taken from to cool the pneumatic air in the heat exchanger?
Fan Cooled Air
153
The over pressure valve protects the users if air is provided from?
The engine HP or LP compressor stage.
154
What is the purpose of the HP control valve?
It is used to determine the source of engine compressor stage
155
Why is important to energise the aircraft prior to pressurising a pneumatic system from external?
Pneumatic systems may start unwanted or unprotected
156
What are pneumatic sources in flight?
Engine and APU
157
Pneumatic operated systems should not be supplied with cold pneumatic air from external, why?
Otherwise icing of valves or turbines may occur
158
In what ways can pneumatic leak detection be carried out?
- Thermal Switches- Manifold failure loops- Pressure switches.
