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Worksheetshệ thống tàu bay ( đề mới )
Total questions: 132
Worksheet time: 1hrs 6mins
At 33,000 feet, how much available oxygen is there compared to sea level
About half
The same as sea level
Twice as much as sea level
About one quarter
If an electronic ice detector senses ice buildup in AUTO mode, what action does it perform
It adjusts the wing slats to reduce ice buildup
It automatically activates the thermal anti-ice systems
It sprays rain repellent fluid on the windshield
It shuts down the aircraft engines
What is the primary function of the pneumatic system on an aircraft, according to the ATA 36 training manual
To provide hydraulic power for landing gear
To cool electrical components
To actuate flight control surfaces
To supply air for engine starting and cabin pressurization
How should a technician adjust the wiper blade pressure to ensure proper windshield wiper performance
Set it to maximum pressure to ensure contact
Disable the wiper motor to prevent overuse
Adjust it within limits to balance contact and prevent damage
Keep it low to avoid scratching the windshield
What is the primary function of the fan air valve in the pneumatic system
To control cooling air mass for the precooler
To regulate bleed air pressure
To isolate wing ducts
To monitor bleed air temperature
What is the advantage of an indirect hydraulic steering system in large jet aircraft
Reduces aircraft weight
Requires less maintenance than direct systems
Enables steering without relying solely on pilot input
Eliminates the need for a steering control valve
What is the primary purpose of the oxygen system on an aircraft
To cool electronic equipment in the avionics bay
To increase cabin pressure to maintain temperature
To supply oxygen to crew and passengers at high altitudes
To reduce aerodynamic drag during flight
Why might passengers experience difficulty concentrating at 20,000 feet if cabin pressure is lost
Dry air causes dehydration
Low temperatures cause brain muscle contraction
Low pressure causes excessive heart rate
Oxygen deficiency reduces blood flow to the brain
What could happen if the manual shut-off valve in a lavatory is not closed during a leak
The vacuum system will activate
The waste tank will overflow
The water heater will overheat
Water will continue to flow into the lavatory
What is the purpose of the cross-bleed manifold in the pneumatic system
To connect left and right wing pneumatic ducts
To cool bleed air
To filter moisture from pneumatic air
To regulate APU bleed air pressure
What is the purpose of the park position in the windshield wiper system
To keep the wiper blade active during high-speed flight
To heat the windshield during ground operations
To reduce the wiper motor’s electrical load
To position the wiper outside the wiping area to prevent dirt accumulation
During pre-flight inspection, a technician finds that the ‘X’ dimension of the shock strut is incorrect. What should be done next
Replace the torsion links
Check alignment of the gear doors
Retract the landing gear to reset the system
Adjust the nitrogen pressure according to the maintenance manual chart
What happens if the fill and overflow valve does not close during water servicing
The water heater activates
The compressor stops
The vacuum system activates
Excess water flows out via the drain port
If a cylinder pressure gauge reads 1400 psi at 0°C, what is the purpose of using the charging chart
To calculate the remaining usage time
To determine fill level compared to standard conditions
To check for cylinder leaks
To adjust the regulator valve and lower pressure
What should a technician do after draining the flush motor toilet tank
Flush the tank with clean water and charge with chemical solution
Depressurize the pneumatic system
Close the anti-siphon valve
Activate the vacuum blower
Why does the chemical oxygen generator reach about 350°C when activated
The sodium chlorate combustion reaction generates oxygen and heat
High oxygen pressure causes friction inside the generator
Fast oxygen flow heats the container
Generator overload due to multiple masks in use
What is the purpose of the manual override on the high-pressure valve
To lock the valve closed during faults
To enable reverse flow
To increase bleed air pressure
To regulate precooler temperature
What component in the water heater prevents damage due to excessive pressure
Thermostat
Pressure relief valve
Overheat switch
Temperature select switch
If a motor-operated wing anti-ice valve fails to open in AUTO mode, what should a technician check first
The rain repellent fluid level
The windshield wiper speed control
The engine bleed air pressure
The valve’s AC motor or limit switch
Why is the cross-bleed valve motor-operated rather than pneumatically operated
To enhance precooler cooling
To enable control independent of air pressure
To reduce system weight
To simplify maintenance
Why is a smoke hood used instead of a full-face mask in some situations
Smoke hoods are lighter and more portable
Smoke hoods do not require a portable oxygen bottle
Smoke hoods protect both the eyes and respiratory system in smoke or toxic gas environments
Smoke hoods deliver oxygen at higher pressure
Why is the air compressor interlock switch activated when the water service panel door is opened
To prevent compressor operation during servicing
To drain the water tanks
To open the fill valve
To increase water pressure
With aircraft equipped with laminated windshields that have a space between the plies that allows the flow of hot air to be directed between the glass, what airspace area can NOT these aircraft fly into?
Icing condition area
Fogging condition area
Non-icing condition area
If a pilot observes ice on the optical ice detector, what should they do next
Increase the aircraft’s altitude to avoid icing
Apply de-icing fluid to the aircraft
Manually activate the thermal anti-ice systems
Continue flying without activating any systems
The Lock stay provides:
An over center stops and a geometric UN lock of the L/G
An over center stops and a geometric lock of the L/G
An over center lock and a geometric lock of the L/G
If the shock strut feels too soft during landing, what could be the cause
Excess hydraulic fluid
Excess nitrogen gas
Failed downlock actuator
Misaligned torsion links
What type of heat exchanger is typically used as a precooler
Air-to-air
Air-to-liquid
Plate-fin
Liquid-to-air
If the PSU door does not open when the passenger oxygen system is activated, what should the technician check in the pneumatic system
Regulator valve on the oxygen cylinder
Safety disk on the oxygen cylinder
Cockpit pressure gauge
Flow control unit
If the landing gear does not extend normally, which system should the pilot activate
Downlock actuator
Main gear actuator
Emergency free-fall extension system
Nosewheel steering system
What is the role of the shock strut in the main landing gear
Absorbs impact during landing and supports the aircraft on the ground
Controls aircraft steering while taxiing
Retracts the landing gear into the fuselage
Controls hydraulic pressure in the actuator
The Brake cooling fans system is controlled:
Manually
Automatically
Intermittently
The Alternate braking system uses hydraulic from:
Yellow system
Green System
Blue System
What is the advantage of using a hydrophobic coating over a rain repellent fluid system
It is less effective at repelling water
It increases the windshield’s weight
It operates without pilot action or maintenance until the coating degrades
It requires frequent reapplication
Why are electrical shut-off valves used in the potable water system of large aircraft
To heat the water supply
To drain the waste tanks
To increase water pressure
To isolate sections of the water supply in case of a leakage
What is the purpose of the safety disk on the oxygen cylinder head
Connects the cylinder to the distribution line
Displays current cylinder pressure
Controls oxygen flow to the mask
Prevents overpressure by bursting at a specific level
The Normal braking controlled and monitored by:
Break/Steering Control Unit (BSCU)
Alternate Break Control Unit (ABCU)
Landing Gear Control & Interface Unit (LGCIU)
If the flow indicator in the mask storage box does not blink during testing, what should the technician do
Check oxygen supply from the cylinder
Immediately replace the oxygen mask
Ignore it, as the indicator is not important
Close the supply valve inside the box
When using the APU to pressurize the pneumatic system, what happens to the cross-bleed valve if the selector is set to Auto
Opens automatically
Isolates the APU duct
Opens only manually
Remains closed
While servicing with oil, bubbles are seen escaping from the air valve. What does this indicate
Oil level is incorrect and needs adjustment
The shock strut is fully serviced
Nitrogen pressure is too high
Torsion links are misaligned
What should a technician do to drain the potable water system for maintenance
Pressurize the system with bleed air
Open the drain valves and shut-off valves
Activate the vacuum system
Close all shut-off valves
Why are continuous-flow masks primarily used for first aid purposes
They are lighter and more portable than demand masks
They protect eyes from smoke and gas
They supply a constant flow of oxygen, ideal for patients needing respiratory support
They don’t require connection to a portable bottle
When does the vacuum blower in the vacuum toilet system operate
Below 16,000 ft when the flush switch is pressed
Above 16,000 ft
When the waste tank is full
When does the vacuum blower in the vacuum toilet system operate?
Below 16,000 ft when the flush switch is pressed
Above 16,000 ft
When the waste tank is full
During water servicing
Why is the thermal anti-ice system not kept on continuously during flight?
It reduces engine performance and fuel economy
It causes the aircraft to overheat
It increases the aircraft’s lift
It damages the windshield coating
How is the precooler’s cooling effect adjusted to maintain constant temperature?
By varying fan air mass through the fan air valve
By closing the APU bleed valve
By opening the cross-bleed valve
By adjusting engine thrust
What could be the result of a failure in the leak detection system?
Reduced engine efficiency
Increased cabin pressure
Backflow into the APU
Undetected overheating causing duct damage
Nose Wheel Steering (NWS) can be turned (angles) to:
N/WS Rudder pedals max 74 degrees
Max 6 degrees with Rudder pedals and Auto pilot And N/WS Hand wheels max 74 degrees
Max 6 degrees with Hand wheels and Auto pilot
In a chemical oxygen system, why must the passenger mask lanyard be pulled?
To open the storage compartment door
To activate the chemical reaction in the generator
To check oxygen flow to the mask
To adjust the oxygen pressure to the mask
If the pneumatic controller receives an engine fire switch input, what is the likely response?
Closes the related engine bleed valve
Activates the APU bleed valve
Opens the cross-bleed valve
Opens the fan air valve
How does the pneumatic controller detect a leak in the pneumatic duct?
By measuring APU bleed air pressure
By monitoring engine thrust levels
Via overheat detection sensors signaling an overheat
By analyzing fan air valve position
What is the role of the precooler in the pneumatic system?
To filter air contaminants
To increase bleed air pressure
To regulate APU bleed air flow
To cool engine bleed air temperature
What are the three main subsystems of the aircraft water and waste system?
Lavatory system, galley system, waste system
Hydraulic system, fuel system, toilet waste system
Lavatory system, waste water system, potable water system
Potable water system, waste water system, toilet waste system
How does the pneumatic controller respond to an overpressure condition detected by a pressure switch?
Activates a fault light and ECAM/EICAS warning
Increases fan air valve opening
Closes the APU bleed valve
Opens the cross-bleed valve
Bleed air used for anti-icing of leading-edge slat number:
2,3,4
1,2,3,4,5
3,4,5
Why does the bleed valve include a check valve function?
To cool bleed air before distribution
To prevent reverse flow into the engine compressor
To increase manifold pressure
To isolate APU from engine bleed
What is the primary function of the thermal wing anti-ice system in jet aircraft?
To spray de-icing fluid on the wings
To heat the wing leading edge to prevent ice buildup
To cool the wing leading edge
To inflate rubber boots to remove ice
Why are position switches built into the bleed valve?
To prevent overtemperature conditions
To monitor valve position for the pneumatic controller
To control fan air valve operation
To regulate pressure directly
If the main seal of a shock strut is leaking, what temporary fix may be applied on some aircraft?
Activate the backup seal using a control valve
Drain all hydraulic fluid
Replace the inner cylinder
Adjust the laminar flow orifice
What happens if too much oil is filled in a shock strut?
Nitrogen leaks from the strut
The strut fully extends with no issue
The strut becomes stiff due to insufficient gas space
The strut becomes too soft and may bottom out
What is the consequence of not removing the ground safety pin before flight?
The gear doors will remain open
The gear cannot retract, preventing a safe flight
The nosewheel steering system will not operate
The shock strut will become over-pressurized
What controls the automatic stopping of water supply in modern aircraft?
Infrared sensor
Pressure relief valve
Quantity control unit
Manual shut-off valve
What is the role of the limit switches in a solenoid-controlled anti-ice valve?
They monitor the valve’s position to ensure correct operation
They activate the rain repellent system
They regulate the air pressure in the valve
They control the wiper motor speed
The computer responsible for Alternate Braking operation is:
Alternate Braking Control Unit (ABCU)
Landing Gear Control and Interface Unit (LGCIU)
Braking/Steering Control Unit (BSCU)
Why is medical oxygen not used in aircraft oxygen systems?
It lacks sufficient pressure for aircraft cylinders
It contains contaminants
It is incompatible with flight crew oxygen masks
It contains water droplets that can freeze at low temperatures
If the windshield wiper motor overheats, what component prevents damage?
The telescoping duct
The bimetal switch in the motor assembly
The engine anti-ice valve
The rain repellent valve
If the pressure switch fails to open at 40 psi, what prevents damage to the potable water system?
The pressure relief valve opening at 60 psi
The manual shut-off valve
The check valve
The air filter
The engine bleed air supplied as:
Bleed air temperature only regulated not pressure
Pressure and Temperature regulated before it supplied to user
Hot air supplied Directly to the user
What is the consequence of a shorted thermistor in the window heat system?
The system activates the probe heat circuit
The system operates normally without issues
The system shuts down to prevent overheating
The system applies maximum heat, risking window damage
What should a technician do if the fault light illuminates when the wing anti-ice pushbutton is switched on?
Apply de-icing fluid to the wings
Activate the windshield wiper system
Check the pressure downstream of the valve for less than 14 psi
Test the rain repellent system
How is the fill and overflow valve opened during water servicing?
By pulling the T-handle via a teleflex cable
By activating the quantity control unit
By pressing the interlock switch
By opening the drain valve
The BMCs work when:
Manual action required by the pilot
As in A, and shutting off the engine bleed in affected side
If a leak detected the signals sent to BMCs which automatically isolates the affected area by closing X bleed valve
What is the function of the laminar flow orifice in the shock strut?
Allows laminar flow in one direction and turbulent flow in the other to prevent bouncing
Maintains constant hydraulic pressure in the actuator
Controls the retraction speed of the landing gear
Connects torsion links to the inner cylinder
A technician observes wheel shimmy during taxi. Which component should be inspected?
Fluid metering unit
Torsion link damper
Downlock spring
Uplock actuator
What is the effect of cabin depressurization at 40,000 feet without supplemental oxygen?
No significant effect
Fatigue and drowsiness after a few minutes
Muscle pain and temporary memory loss
Loss of consciousness after about 15 seconds
Why does the passenger oxygen system have more masks than seats?
To accommodate children sharing seats with adults
To speed up oxygen system deployment
To provide backup oxygen for the flight crew
To increase cabin oxygen pressure
What is the main function of the landing gear system on a jet aircraft when operating on the ground?
To support the aircraft and absorb impact forces during landing
To reduce drag during flight
To supply hydraulic power for control systems
To accelerate the aircraft during takeoff
Why is a thermal compensator regulator used when filling an oxygen cylinder?
To control oxygen flow to the mask
To increase cylinder oxygen pressure
To reduce cylinder weight
To dissipate heat generated during filling and prevent explosion
Why is a pressure relief valve included in the water heater?
To control water flow to the faucet
To prevent damage from pressure exceeding 140 psi
To mix hot and cold water
To heat the water to 52°C
If the high-pressure valve is open, what prevents backflow into the engine’s intermediate pressure stage?
Bleed valve
Check valve
Fan air valve
Cross-bleed valve
Why should a technician avoid touching the drain mast immediately after it has been switched off?
It may be hot enough to cause burns
It may activate the vacuum system
It may be electrically charged
It may release waste water
From which two compressor stages is engine bleed air typically sourced?
Fan Stage and Compressor Stage
Low Pressure and Medium Pressure
Intermediate Pressure and High Pressure
High Pressure and Ultra-High Pressure
What happens if the waste tank level sensor detects a full tank?
The drain valve opens automatically
The vacuum blower stops
The flush circuits are inhibited and the LAV INOP light activates
The potable water system is pressurized
During a ground test, why must both wing anti-ice valves be locked closed if one is disabled?
To reduce the aircraft’s weight
To prevent overheating of the pneumatic system
To increase the engine’s bleed air supply
To maintain symmetrical operation and aerodynamic balance
Why is a pressure regulator required in the engine bleed air system?
To heat the bleed air
To limit airflow to anti-icing systems
To ensure constant pressure for consumers despite varying thrust
To block APU air supply
If the passenger oxygen system fails to activate automatically, what should the crew do?
Check the oxygen cylinder pressure
Replace the chemical oxygen generators
Immediately descend the aircraft
.Switch on “Mask Man On” from the cockpit
The Normal braking powered by:
Yellow hydraulic system
Green Hydraulic system
Blue hydraulic system
How is water flow controlled in a mechanical faucet with a single water inlet
By adjusting the mixer valve
By opening the solenoid valve
By rotating the flush handle
By pressing the actuator button to start and stop water flow
What is the role of the check valves in the potable water pressurization system
To regulate water temperature
To prevent reverse flow of water and air
To filter air supply
To control compressor operation
Nose Wheel Steering Uses:
Blue Hydraulics
Green Hydraulic
Yellow Hydraulics
The Safety valve closes when the aircraft in:
Ground
Take-off
Flight at High speed
When pressurizing with an external air supply, what prevents accidental cabin pressurization
Keeping at least one window or door open
Closing all bleed valves
Running the APU
Closing the cross-bleed valve
Why is a safety valve included in the waste tank drain fitting
To flush the tank with clean water
To prevent waste leakage from a faulty drain valve
To activate the vacuum blower
To increase vacuum pressure
What is the primary function of the diluter demand regulator in the flight crew oxygen system
Reduces cylinder pressure to usable level
Controls oxygen flow to the passenger cabin
Supplies a mix of air and oxygen or pure oxygen based on altitude
Prevents oxygen leakage from the mask
Which valve controls the supply of APU bleed air to the pneumatic system
Cross-bleed valve
High-pressure valve
Fan air valve
APU bleed valve
For A/SKID protection the Braking/Steering Control Unit (BSCU) receives data from:
Wheel speed from Tachometers
Tire pressure from TPIS
As in B, Aircraft speed data from ADIRU
If the pilot notices the aircraft veering during taxi, which system should be checked first
Main gear brakes
Nosewheel steering system
Landing gear doors
Shock strut pressure
What is the main purpose of the portable oxygen system on an aircraft
To supply oxygen during normal passenger flight
To replace the flight crew oxygen system during depressurization
To cool the oxygen cylinder in the cargo hold
To provide emergency oxygen and first aid, protect eyes in smoke environments
If the precooler outlet temperature exceeds 200°C, what action does the system take
Fully closes the fan air valve
Activates the APU bleed valve
Closes the bleed valve via thermostat action
Opens the cross-bleed valve
If the water heater’s thermostat fails and the water temperature reaches 90°C, what happens
The overheat switch opens and must be manually reset
The mixer valve closes
The pressure relief valve opens
The temperature select switch activates
The APU bleed supply connected to:
Right side of the system
The Left side of the system
Directly to the system
What is the standard size of the ground connector for external air supply
5 inches
4 inches
3 inches
2 inches
Why does the probe heat system lack a temperature control circuit
It relies on the window heat system for temperature regulation
It uses a bimetal switch for precise control
It is unnecessary due to constant heating requirements for flight safety
It is only active during ground operations
How do clear ice and rime ice differ in their formation on a wing leading edge
Clear ice forms only at high speeds, rime ice at low speeds
Both ice types form identically with no differences
Rime ice spreads aft, clear ice forms a double horn shape
Clear ice spreads aft, rime ice forms a double horn shape
How does the nose gear differ from the main gear on a jet aircraft
Supports the aircraft’s center of gravity
Bears less load and is steerable, without brakes
Retracts into the fuselage
Has brakes and is not steerable
After the passenger oxygen system is activated, what must the technician do with the masks
Manually repack the masks into the compartments
Ignore them as they return automatically
Check the oxygen flow of each mask
Replace all masks with new ones
Why are ball bearings used in the trunnion link of the main gear
To reduce shock strut weight
To increase gear retraction speed
To transmit axial and drag loads without torque transfer
To simplify hydraulic actuator design
When LDG lever in the cockpit set to Down position, the Extension sequence of actions are:
As in A & B, Doors are closed and locked
Doors are open and Gears are down
Gears are down locked
Which air source does NOT provide for pneumatic system?
Engine Compressor
APU Compressor
Electric Compressor
What is the main difference between a flush motor toilet and a vacuum toilet system
Vacuum toilets use central waste tanks
Flush motor toilets use infrared sensors
Flush motor toilets use bleed air
Vacuum toilets require manual flushing
What could happen if the filter basket in a flush motor toilet becomes clogged
The drain mast will freeze
The vacuum system will activate
The water heater will overheat
The toilet will not flush properly
How is waste water removed from the aircraft during flight
By a vacuum pump
By a compressor
By a flush motor
By gravity and differential pressure
Drain mast heated on
Drain mast always heated on ground or in flight.
only on ground
only in flight
Aquaplaning can be reduced by:
Lowering slats
Increased flaring
An anti-skid device
If an engine anti-ice valve is locked in the open position, what precaution must a technician take during ground tests
Ensure the aircraft is in flight mode
Be cautious of hot air exiting the system
Apply de-icing fluid to the engine inlet
Check the windshield wiper speed
How is the flush motor in a flush motor toilet activated
By an infrared sensor
By a vacuum blower
By a manual shut-off valve
By operating the flush handle to start a timer circuit
When LDG lever in the cockpit set to UP position, the Retraction sequence of actions are:
Door Opens
L/G is Retracted and up-locked
As in A & B, Doors are closed and locked
With the passenger oxygen gaseous system, what is not function of the Flow Control Unit?
It can provide the pressure to open the PSU doors
It can reduce the intermediate oxygen pressure to an adequate level for breathing
It can provide a pressure information to indicate in the cockpit
What is the significance of the overheat protection circuit in the drain mast heat system
It regulates the engine anti-ice valve
It activates the system automatically during flight
It protects the system from damage due to prolonged heating
It prevents excessive wiper blade pressure
Why are thermal anti-ice systems not used for de-icing an aircraft on the ground
They consume too little power to melt ice
They are designed to prevent ice buildup, not remove existing ice
They are only effective at low temperatures
They damage the wing leading edge structure
Why is a telescoping duct necessary in the wing anti-ice system of aircraft with slats
To control the windshield wiper speed
To regulate air pressure in the pneumatic system
To cool the wing leading edge during flight
To extend or retract with slat movement to supply hot air
If an overtemperature sensor detects an abnormal temperature rise downstream of the precooler, what action is taken
Adjusts the cross-bleed valve
Opens the high-pressure valve
Closes the related engine bleed air valve
Increases APU bleed air flow
What component in the vacuum toilet system prevents back flow into the potable water system
Flush valve
Rinse water valve
Anti-siphon valve
Vacuum blower
Where are flight crew oxygen cylinders typically stored on a Boeing 747
Near the emergency exits
In the flight deck
In the passenger cabin
In the cargo hold or avionics compartment
If the availability indicator on the smoke hood changes color, what should the technician do
Check the pressure of the portable oxygen bottle
Use the smoke hood immediately
Ignore it as the indicator doesn’t affect function
Send the hood and container to the shop for overhaul
What is the function of Cross-bleed valve of pneumatic manifold?
No answer is correct
To isolate Wing & APU duct
To isolate the Left & Right wing duct
What type of valve is typically used as the bleed valve in the pneumatic system
Ball valve
Poppet valve
Butterfly valve
Gate valve
During pressurization with external air, what should a technician check on the ECAM display
APU bleed valve position
Engine thrust settings
Fan air valve status
Pressurization indications on the bleed page
Why must the potable water system be completely drained in freezing conditions
To prevent overheating of the water heater
To clean the waste tanks
To avoid damage from frozen water in the lines
To reduce aircraft weight
Why should aviation breathing oxygen be used instead of industrial oxygen on aircraft
Industrial oxygen may contain contaminants harmful to users
Industrial oxygen has higher pressure, risking cylinder explosion
Industrial oxygen is not compatible with the distribution system
Industrial oxygen increases aircraft weight
If a pilot notices unreliable airspeed readings during flight, what system failure should they suspect
Windshield wiper system failure
.Rain repellent system failur
Engine anti-ice system failure
Probe heat system failure
By setting ON the parking brake, deactivates the
Right side Brakes
All other braking modes and A/SKID system
.Left side Brakes
Why are shock struts charged with both nitrogen and hydraulic fluid
Nitrogen absorbs impact; hydraulic fluid provides damping
Both can be interchanged for shock absorption
Nitrogen lubricates seals; fluid increases pressure
Hydraulic fluid supports aircraft weight; nitrogen controls response
