final eggszam Flashcards
1
Q
when is the LDG retraction check not required?
A
after prolonged taxiing
2
Q
what causes the caution light in the cockpit to remain on?
A
insufficient fluid in reservoir
3
Q
what is the cooling principle of the vapour cycle machine?
A
thermodynamic cycle consisting of 4 processes.
- compression
- condensation
- expansion
- evaporation
4
Q
where is the water expected to accumulate in the fuel tank?
A
bottom of fuel tank
5
Q
what is the advantage of the AVGAS?
A
easier to start engine
6
Q
which of the following may be designed as the weighing points of an aircraft for weight and balance calculations?
A
nose and main LDG jacking points
7
Q
arresting gear is extended by ___ pressure and retracted by _________ pressure?
A
air, hydraulic
8
Q
in the transonic flight control effectiveness is reduced because of what?
A
control surface is operating in aerodynamically dead air mass
9
Q
what is SARBE
A
Search and Rescue Beacon Equipment
10
Q
fire detectors are used in areas where the risk is the highest
A
high ambient temperature and fluid lines
11
Q
aircraft life is usually determined by
A
flight hours
12
Q
in the typical cabin pressure regulator, how is the control chamber exposed to the atmosphere?
A
outflow valve
13
Q
what is the purpose of the inlet colacing filter?
A
remove moisture and contaminants in ECS
14
Q
name 2 items that can be found inside the Personal Survival Package, PSP?
A
first-aid kit and protective sheaths
15
Q
cabin pressurisation of military aircraft is limited to a max differential pressure of about 3.5 psi due to the danger of _____________.
A
decompression
16
Q
bernoulli’s equation of subsonic flow states that
A
total pressure is equal to the sum of static pressure and dynamic pressure
17
Q
what is the term of movement for rotor blades during a pitch angle change called?
A
feathering
18
Q
during normal flight, what is the normal cabin pressure?
A
8000 ft
19
Q
the main purpose of metering pin found in shock strut is for what?
A
regulate flow between 2 cylinders
20
Q
afterburners will produce approx ___ increase of thrust but with the corresponding ___ increase in fuel flow?
A
50%, 150%
21
Q
what happens when the pressure closing valve is shut?
A
stops the flow of fluid or gas through a pipeline or vessel
22
Q
in the rotor brake system, if the pilot move the braking lever to the static braking notch, what is the pressure on the brake?
A
100 bar
23
Q
which part of the parachute is strong and contains some elasticity
A
main canopy
24
Q
what are the surfaces that require electrical heating in the turboprop engine?
A
air intake cowling of engine, propeller blades, spinner assembly
25
when does the high level indication light turn on during pressure refuelling?
when fuel tank is full
26
state the afterburning principle
to a/c takeoff, climb, and combat performance
27
a developer is applied onto surfaces of the test material to draw out the penetrant from the flaw by?
capillary action
28
which component is designed to operate in 2.5s after being immersed in seawater.
Seawater Activated Release System (SEAWAR)
29
name the 4 primary components of a basic hydraulic component
valve pump, reservoir, jack, actuator
30
jet aircraft use nose wheel landing gear and not nose wheel landing gear because of?
boasts good directional stability when aircraft lands
31
air turbine starter generally incorporates a reduction gear to convert the?
high speed, low torque of turbine wheel to
low speed, high torque to output shaft
32
what are the characteristic of a pressure demand oxygen system?
longest ans or smth /
Pressure Regulator, Face Mask, Demand Valve, Oxygen Cylinder, Pressure Gauge and Alarm System
33
in the anti-icing pneumatic system, the deicer consists of a series of what?
inflatable tubes
34
what is the advantage of a temperature control circuit using electronic components?
mechanical part can cause wear and tear
35
in a typical helicopter fuel system, what is the function of the jet pump?
transfer fuel from feeder tank to engine
36
what are the properties that affect aerodynamic behaviour?
- shape
- surface area
- velocity
- density
37
to activate normal pressure demand mode for oxygen supply, the switches on the oxygen regulator panel must be set to?
emergency lever: norm
diluter lever: norm
mode lever: on
38
what is the advantage of cable control system over push pull rod system?
has less mechanical play
39
what does the ply rating of the aircraft tyre thickness indicate?
strength of tire
40
# FITB
the type of propelling nozzle used on supersonic aircraft is _________________.
variable geometry
41
# FITB
the ____________ is subjected to edgewise vibration.
turbine blades
42
# FITB
in the thrust reversal system, the cold stream system is actuated by an _________.
air motor
43
# FITB
the ________ is a fixed structural extension of the upper strut cylinder with bearing surfaces that allow the entire gear assembly to move?
trunnion
44
# FITB
in the event of a fire or overheat condition, the ________________ in the thermal switch closes.
electrical contact
45
# FITB
cabin pressurisation of military aircraft is limited to a max differential 3.5 psi due to the danger of _____________.
decompression
46
# FITB
xeolide in the sieve beds allows only ______ to pass through
oxygen
47
# FITB
there are ____ molecular sieve beds in the oxygen concentrator
4*6 mesh worth
48
# FITB
life rafts are generally inflated by ______________
carbon dioxide
49
# FITB
what is designed to contain the riser, suspension lines, canopy… (parachute)
container
50
# FITB
what drives the turbine in the cold air unit of the air conditioning system
ram air
51
# FITB
the purpose of limit microswitch in the motor operated shutoff valve used in anti icing systems is to prevent ____________ of the motor.
overheating
52
# FITB
the left hand and right hand pointers of the fuel content indication returns to ____ when the test button is activated.
zero
53
# FITB
should one of the boost pumps fail, what prevents the fuel discharge by the operating pump?
check valve
54
# FITB
fuel quantity is measured by the _________________.
capacitance probe
55
# FITB
the component that enables the rotor disc to tilt is the __________.
swashplate
56
# FITB
____________ will be resulted when the dihedral effect is stronger in comparison to directional stability.
spiral effect
57
# FITB
________ is done by equalizing the lift, drag, brake and thrust force.
hovering
58
# FITB
when accelerating, ____ gravity forces on the body increases
g-force
59
# FITB
____________ measures the resistance of a material to elastic deformation under load.
young's modulus
60
# FITB
the corrosion prevention for alumimium alloy is by
hot rolling
61
# FITB
in the powered flight control system, the air load on the control surface is felted by the ____ control
servo
62
# FITB
hydraulic seals are generally classified as packing and gaskets. packing are used as what kind of seals?
dynamic
63
# FITB
during hydraulic servicing, need to operate a particular service several times to allow the contaminants to be trapped by the ______.
filter
64
# FITB
the ________ anchors the tyre carcass and provides the dimension.
tire bead
65
# SAQ
In a conventional flight control system, the sequence of operations is …
| 3 areas of 2 points each
**Pilot input**
1. Pilot uses control devices to command aircraft manoeuvre
2. Inputs are transmitted to flight control system
**Mechanical linkage**
1. Pilot’s input is transmitted through mechanical linkages (cables, rods, or push-pull tubes)
2. Connect control devices to the control surfaces
**Control surface movement**
1. Mechanical linkages transfer pilot’s input to the control surfaces
2. Control surfaces move in response to the desired manoeuvre
66
# SAQ
What is the core material of ALCLAD 2024-T4?
| 6 pointers (2xxx, x0xx, -T4, 3 properties)
- Core material: 2024 alumimium alloy
- 2xxx series: alumimium alloy with copper as main alloying element
- x0xx: 2nd number indicates that original composition of alloy without modifications
- -T4: solution heat-treated, naturally ages
- high strength-to-weight ratio, good machinability & surface finish
67
# SAQ
State the primary purpose of the main rotor transmission and its working principals in relation to the engine.
| 7 points
- primarily reduces engine output rpm to optimum rotor rpm
- reduces high-speed input from engine
- increases torque output of engine
- distributes engine power to main rotor and other helicopter systems
- maintains proper coordination and phasing between multiple rotors
- allows smooth starting, stopping, mid-flight adjustments of rotor speed
- ensures proper lubrication and cooling
68
# SAQ
What are the 4 basic principles of survival?
| 4 main points, 2 subpoints each
**protection**
- stay safe from environmental elements, wild animals, and other hazards
**location**
- finding your way around, knowing where you are
- finding food, water, shelter, where to signal for help
**water**
- finding and purifying water
- make water safe to drink
**food**
- finding, gathering, preparing food
- food is essential for survival
69
# SAQ
list the functions and operations of the fuel temperature indicator.
**Monitors fuel temperature in aircraft fuel tanks**
* uses a temperature sensor
* usually a thermocouple or resistance temperature detector (RTD)
* information sent to fuel temperature indicator
**Provides a visual indication of the fuel temperature to the flight crew.**
* displayed on cockpit instrument panel
**Provides a warning to the flight crew through a warning light or audible alarm if the fuel temperature exceeds safe limits**
**Diagnose fuel system problems**
* Fuel temperature readings are compared to expected values
* Discrepancies can indicate issues such as fuel contamination or blockages in the fuel lines.
70
# SAQ
as the angle of attack of an airfoil increases, what will happen to the centre of pressure?
- Center of pressure on the airfoil is
- where total aerodynamic force is considered to acting
- reference point for airfoil aerodynamic moments calculation
- Low AoA:
- Center of pressure located near quarter-chord point of airfoil, way back from airfoil leading edge.
- Increasing AoA:
- Center of pressure moves forward, towards airfoil leading edge.
- Increased lift and lift coefficient.
- Point of max. lift moves forward along airfoil.
- Beyond certain AoA
- Center of pressure may move aft, towards trailing edge
- airflow separation over upper surface of airfoil
- lift reduction
- shift in pressure distribution
- leads to stall: a sudden loss of lift and increase in drag
- Movement of center of pressure must be considered in design and analysis for airfoils and wings, and to predict aircraft flight behaviour.
71
# SAQ
what does the shock strut consist of?
| 4 components, 3, 2, 2, 2
2 telescoping cylinders:
- The top cylinder is attached to the aircraft
- The bottom cylinder is attached to the landing gear
- The bottom cylinder, called the piston, can freely slide in and out of the upper cylinder
Hydraulic fluid:
- Contained within the upper cylinder
- Provides support and cushioning for the piston
Nitrogen gas:
- Contained within the lower cylinder
- Prevent excessive expansion hydraulic fluid
Valves:
- Allows hydraulic fluid and nitrogen gas to flow between two cylinders.
- Enable the extension and retraction of the shock strut during landing and takeoff.
72
# SAQ
how does the heat exchanger lower the temperature of bleed air?
| 5 points
- Heat exchanger lowers bleed air temperature.
- Bleed air passes through the heat exchanger.
- Heat exchanger transfers heat from bleed air to another medium (usually ambient air or coolant).
- Transfer of heat reduces the temperature of the bleed air.
- Cooled bleed air is then used for various purposes in the aircraft system.
73
# SAQ
for cabin pressurisation, state the functions of outflow valves
| 4 points
- regulate rate of air outflow from aircraft cabin
- maintain a specific pressure differential between the cabin and outside environment
- adjust cabin altitude to ensure passenger comfort & safety
- maintains desired pressure level
74
# SAQ
for cabin pressurisation, state the functions of pressure relief
| 4 points
- prevents excessive pressure buildup in cabin
- automatically opens, releasing excess air pressure
- protect the aircraft structure and components from potential damage
- ensures structural integrity of cabin
75
# SAQ
for cabin pressurisation, state the functions of dump valve
| 4 points
- serve as a safety device that rapidly releases excess air pressure in emergency situations
- protect the aircraft structure and components from extreme pressure conditions
- assist in preventing cabin rupture
- help maintain the desired pressure level by quickly dumping excessive air pressure
