Mr Mech Flashcards
1
Q
What are the flight controls for lift devices?
A
- Slats (Leading edge devices)
- Flaps
- Speed Brakes
2
Q
What happens to the strength of metallic structures when it is heated due to high speed condition of flight?
A
Decrease in strength
3
Q
What are included in the primary flight controls?
A
Ailerons
Roll Spoilers
Elevators
Rudder
4
Q
What limits the rudder deflection?
A
Airspeed
5
Q
The Tab that deflects in the same direction as the control surface
A
Anti Balance Tab
6
Q
What is the value of the critical mach number?
A
0.8
7
Q
What is the value of the local mach number?
A
1
8
Q
What forms at the leading edge when flight speed exceeds the speed of sound?
A
Bow wave
9
Q
In Airbus 320 identification system, What is the reference point for Z Axis?
Reference point for Z Axis?
A
240 millimetres above the floor beams
10
Q
These are vertical planes parallel to the body centerline plane
A
Body Buttock Lines (BBL)
11
Q
Type of fuselage construction where the skin shares the load with the stringers, the frames and with an additional clip
Type of fuselage construction where the frames are joined together by stringers, and skin with clips
A
Semi-Monocoque Structure
12
Q
This stress is a combination of compression and tension
A
Bending
13
Q
These are able to carry torsion, compression and shear loads and also give shape to the wing and provide walls for the fuel tanks.
A
Ribs
14
Q
What are the different functions of the air conditioning system?
A
- Cools
- Heats
- Ventilates
- Pressurizes
15
Q
These are the electrical devices used in the cargo loading system in order to move the cargo containers and pallets inside the cargo compartment
A
Power Drive Units (PDU)
16
Q
What regulates the supply of pressure corresponding to all flight altitudes?
A
Outflow Valve
17
Q
A computer that regulates the amount of trim air that is mixed with the cold air that flows out through the pack
A
Zone Controller
18
Q
A computer that regulates the temperature of the cold air that leaves the pack
A computer that regulates the temperature of the cold air that gives the pack
A
Pack Controllers
19
Q
What are the sources of pneumatics?
A
- Engine
- APU (Auxiliary Power Unit
- Ground Connectors (Ground Carts)
20
Q
Aircraft Pneumatic Energy is used for:
*Engine Starting
*Cabin Pressurization and Air Conditioning
*Wing Anti-Icing
*Water Reservoir Pressurization
*Hydraulic Pressurization
A
True
21
Q
What happens in supersonic flight?
A
Density Increases
Pressure Increases
Temperature Increases
Velocity Decreases
22
Q
Why do we need to pressurize the cabin to a value which corresponds to an altitude of 8000feet (2400metres)?
A
Pressurization has to be a compromise between passenger comfort and structural design
23
Q
Where are pack controllers located?
A
Avionics Compartment and/or Electric and Electronic Compartment
24
Q
It is a computer with specified tasks. Its role is to monitor pressure and temperature, to register leaks, and to monitor the operation of the pneumatic components.
A
Pneumatic Controller
25
These are located on exterior surfaces of the fuselage, wing and tail section to drain any fluids overboard. These drains are always open
Drain Ports / Drain Mast
26
What are the different components of air cycle machine?
Compressor
Turbine
Fan
27
What is used to heat cargo compartment?
Hot Bleed Air
Electrical Heater
28
Air is removed from the lavatories and galleys by what?
Extraction Fan
29
If a fluid is ______it has the tendency to absorb water
Hydroscopic
30
They allow manual filling of the reservoir and other provide manual opening of cargo doors.
Used in manual cargo door operation
Fixed Displacement Pumps (FDP)
31
The shock struts operates harshly when there is
Too much oil
32
The result is a soft strut/shock strut when there is
Too much gas
33
A tire can be used approximately what?
150 landings and takeoffs
34
The fill and overflow valve will open when you pull the___
It retracts automatically when the actuator closes the valve.
T-Handle
35
These are used to seal where stroking or rotational movements occur.
Dynamic Seal
36
The flight crew safety harness is a
5 point type
37
The cabin crew safety harness is a
4 point type harness, single release
38
The low ambient air pressure gives enough differential pressure for the system to operate efficiently above an altitude of_____
An altitude pressure switch activates a vacuum blower below_____
16000 ft
39
What are the ways to control the cockpit seats?
Manually and Electrically
40
How do we operate bulk cargo door?
Manually operated and opens inward
41
When does ELT activates?
When submerged in water or When impact is detected
42
The secondary flight controls are consists of what?
What are the two sub-categories in the secondary flight control?
Lift devices and Trim systems
43
What are the main lift devices?
Flaps
44
There are 2 ways to reduce the wave drag. One is to use vortex generators and the other is to apply the
Area Rule
45
Area rule that has lesser wave drag
Waist Fuselage
46
A vertical plane at a right angle to the body centerline.
Body Station (B STA)
47
Fuselage construction made of members such as beams, struts, and bars to resist deformation by applied loads
Truss-type construction
48
What major zone is Powerplant?
400
49
Duplication of certain structural members to ensure that if one member failed, the other would assume the load of the failed member
Fail safe
50
What are the glass composition of the cockpit windows?
Thermally strengthened
glass and 2 inner chemically strengthened glass
51
Cooling device that is used in aircraft when engine bleed air is not available
Vapor Cycle Machine
52
Cooling device that is used in most iet aircraft
Air Cycle Machine
53
This system consists of Check Valve, Fan, and Air Filter
Recirculation system
54
It can supply fresh ambient air to the mixing unit when all packs fail during flight.
Emergency Ram Air Inlet
55
At what altitude the relief valve will open?
15000 ft
56
How much power supply does static inverter supplies to the razor outlet sockets?
110V AC , 60Hz
57
Cylinder bottle of gaseous oxygen
PSU
58
What is the flashpoint of fuel?
The lowest temperature at which the fuel creates just enough vapors to build up a fuel/ air mixture that can be inflamed.
59
A type of drain valves where a drain line runs from the lowest point in the fuel tank to the valve housing.
Indirect drain valves
60
A refueling mode that is an alternative procedure if electrical power to the refueling valves is not available.
Override mode
61
It is an area rule where there is a large increase in wave drag in transsonic region
Old Military Aircraft
62
This means that the brakes on the left main gear wheels and the brakes on the right main gear wheels can be operated separately.
Differential Braking
63
Supersonic airflow passes through a shockwave the density increases, the pressure increases, the temperature increases and the velocity decreases.
Supersonic flight
64
It is the wing up and wing down motion around the longitudinal axis.
Roll
65
It is the nose up and down motion around the lateral axis
Pitch
66
It is the nose left and nose right motion around the vertical axis
Yaw
67
Rudder load relief devices prevent structural damage by limiting the maximum rudder deflection in accordance with what?
Airspeed
68
The speed brakes operate___
symmetrically on each wings
69
Usually, they are numbered from forward to aft, from inboard to outboard, and from bottom to top.
Zones
70
A design principle requires that major structural elements are replaced after a fixed number of flight cycles.
Safe life
71
Maintains shape of the fuselage and carry the loads.
Frames
72
Part of the door structure that provides additional rigidity
Intercostals
73
Normal flight cabin pressure for sufficient oxygen and maximum differential pressure of structural design at altitude.
8000 ft
74
At what cabin altitude will oxygen masks automatically released from the passenger cabin ceiling?
14000 ft
75
This section of the rack houses all the distribution circuit breakers protecting the electrical lines supplying the systems
Rack Upper Section
76
What are installed on the seat tracks of the cabin floor structure?
Passenger Seats
77
These fittings at the front and the rear legs hold the seats in position.
Quick Release Fittings
78
What are the main galley attachment points on the floor?
Hard Point and/or
Seat rail attachments
79
What are the main galley attachment points at the upper fuselage structure?
Tie Rod attachments
80
What are the components used to move the ULD?
Ball Mats
Roller Tracks
Power Drive Units (PDU)
81
It has a small electric motor that initiates a vibration of the control column to alert the pilot when the A/C approaches stall condition.
Stick Shaker
82
In this system, the greater the number of connections, the greater the mechanical play, the less accurate the transmission.
Cable System
83
These solvents should not be used for cable cleaning, because they remove grease from strands inside the cable.
MEC
PER
84
It has a heat shrinkable sleeve, which prevents adjustment of the end fittings
Non-Adjustable Rods
85
Used to transmit torque for linear movement
Torque Shaft
86
Used to transmit torque for rotary movement.
Torque Tube
87
This changes hydraulic pressure into mechanical force
Power Section
88
It is used to change the hydraulic flow to the cylinder to produce an extend or a retract motion
Sometimes called a metering valve
•Distribution Control Valve
89
The servo control unit 2 main operating modes
Damping mode
Control or Active Mode
90
It is used as a gust dumper for the flight control surface when the A/C is on ground.
Damping Mode
91
It uses hydraulic power to move the surface, but the hydraulic power does not come from an external system. - An electro motor driven hydraulic pump
Electro hydraulic Actuator (EHA)
92
It is installed to provide the pilot with an artificial feel of the air load
Feel unit
93
Consist of an electric motor operated screw jack
Trim Unit
94
Pressure produced by static or nearly static fluids
Hydrostatic pressure
95
Pressure produced by moving liquid ideally with no internal friction.
Hydrodynamic pressure
96
Due to design constraints or safety requirements some drain valves are not at the lowest point of a fuel tank. On these valves a drain line runs from the lowest point in the fuel tank to the valve housing
Indirect Drain Valves
97
It is the most commonly used fuel type for jet engines in Europe.
It has a high flash point of +38°C and a low freezing point of -47°C
Jet A1
98
It is the most commonly used fuel type for jet engines in America.
It has a high flash point of +38°C and a low freezing point of -40°C
Jet A
99
It is the mainly used for military jet engines
It has a very low flash point of -20°C and a very low freezing point of -60°C
Jet B
100
It has a very high flash point of +65°C and a relatively low freezing point of -48°C
JP 5
101
It is used where two plates join
Fillet seal
102
It is used to cover a nut or a bolt
Cap Seal
103
It is indicated as a mass, in kilograms or Ton
Fuel Quantity
104
Installed vertically in each tank and reach the bottom of the tank to the top.
Fuel Quantity Probes
105
Used to measure fuel temperature
Thermistor
106
It surrounded the tube housing and is used to determine the fuel level in the tank
Float
107
It has a calibrated rod which reaches into the fuel tank. They are locked at the lower wing surface by locking pins
Drip Sticks
108
These sticks allowed the measurement of the fuel level without the disadvantage of fuel dripping out of the drip holes
Manual Magnetic level indicators
109
Auxiliary source used for the blue hydraulic system
RAT
110
It is used to make a seal between the environment and the fluid pressure inside.
Packing
111
Also called seals, prevent leaks from the component housings and provide a seal between 2 different fluid pressures within a component
Packings
112
Its characteristic is mineral oil and red color
Skydrol and Hyjet
113
Its characteristic is synthetic oil and purple color
MIL-H-5606
114
Used to seal against steady or pulsating pressure
Static Seals
115
In normal operating position, it allows pressurized fluid to flow the user via port 1. Can be closed via cockpit switch in order to test the internal leakage of the hydraulic component. When closed users no longer supplied by port 1, port 2 becomes fluid supply.
Leak Measurement Solenoid Valve
116
Its purpose is to close the hydraulic circuit to different users when there is very high demand in the system.
Priority Valve
117
It combines all of the return lines into a single line going back to the reservoir.
LP (Low Pressure) Manifold
118
It distributes pressure fluid to the users.
HP (High Pressure) Manifold
119
It transmits hydraulic power through the rack and pinion mechanism to steer the nose gear wheels.
Steering actuating cylinder
120
It occurs when main gears resist the turn
Scrubbing
121
It opens forward doors that are mechanically locked in the closed position by a door uplock.
Ground Control Handle
122
It receives signals about the position of the doors and the gears from proximity sensors and sends a command signal to the selector valve manifold
L.G.C.I.U (Landing Gear Control
Interface Unit)
123
This can be used to manually override the solenoid if there is a failure in the system. Allows you to select the UP position of the control lever at any time, even when the aircraft is on the ground.
Lock Override Pushbutton
124
It gives a visual indication of the overall wear of the heat pack.
Wear Indicator Pin
125
Anti skid system automatically switches itself off when the aircraft speed decreases below a level of
10 Knots
126
It engage when the inner cylinder extends to make sure that the nose gear is in a straight and forward position during retraction
Centering Cams
127
May be used to lock the downlock actuator when the aircraft is on the ground. Must be removed before flight.
Ground safety locks, or sleeves
128
It give signals when the landing gear doors are in an open position.
Proximity Sensors
129
Transmit vertical loads and drag loads into the airframe without transferring torque to the structure and to the outer cylinder during structural deflections.
Spherical Bearings
130
Supports the aircraft on the ground and protects the aircraft structure by absorbing the shock on landing
Shock strut
131
It gives lateral support to the shock strut. Named, side stay or side brace.
Side Strut
132
It stabilizes the shock strut in fore and aft directions, and locks the nose gear in the down and up position, named drag stay or drag brace.
Drag Strut
133
Attached to the drag strut assembly. It gives secondary support for the down and locked position of the nose gear. It controls the alignment of the folding drag strut
Lock Stay
134
Waste water system directs the waste water out of the aircraft through what?
Drain Masts and Drain Lines
135
Altitude where there is no need of vacuum blower flushing
16000 ft
136
Check valve that prevents back flow of water from the toilet into the potable water system.
Anti Siphon Valve
137
It distributes water to the toilet, to the water heater, to the mixer valve and via the faucet into the washbasin
Header
138
Also named liquid
separator. Removes moisture and waste particles from the waste tank air before it is vented overboard by the vacuum blower.
Water Separator
139
The pneumatic ducts are monitored by a
Leak Detection System
