LANDING GEAR - Dgca question bank for pilots

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#1. The advantages of tubeless tyres include? 1.The tube cannot rotate within the tyre. 2.The tyre cannot rotate relative to the wheel. 3.The tyre will deflate if there is excessive creep. 4.They are more easily fitted to wheels. 5.The valves cannot be sheared off by excessive braking.

1,2,3,4,5.

1,2,4,5.

1,3,4,5.

1,5.

#2. How is gear retraction prevented on the ground?

A warning sign on the lever.

An aural warning system.

Isolation of hydraulic power when on the ground.

Microswitches.

#3. A brake accumulator?

Permits use of brakes when engines are stopped.

Allows for thermal contraction of fluid after shut down.

Maintain braking effect in the event of small leaks when parked.

Prevents excessive use of brakes.

#4. Thermal plugs?

Release brake pressure to prevent overheating of brakes.

Release excessive tyre pressures to prevent wheel/tyre explosions.

Heat up the hydraulic fluid to working temperature.

Active brake cooling fans at some pre-determined temperature.

#5. Landing gear legs are locked down by?

An amber warning light.

The actuating cylinder reaching the end of its range.

An over-centre geometric locking mechanism.

Putting in the ground locks.

#6. An under inflated tyre operating on a dry runway will?

Improve braking efficiency.

Increase wear at the shoulders.

Increase wear at the centre.

Decrease viscous aquaplaning speed.

#7. How is the anti-skid system disconnected?

Automatically when spoilers are deployed.

Automatically upon touch-down.

Automatically when a specified speed is reached after touch down.

Manually. After the end of the landing run.

#8. Tubeless tyres?

Can be deflated by creep.

Explode if punctured.

Can be deflated due to the valve being torn out by excessive braking.

Are lighter than tubed ones.

#9. Anti-skid systems?

Increase fluid pressure to the slower wheel.

Increase fluid pressure to the faster wheel.

Decrease fluid pressure to the slower wheel.

Decrease fluid pressure to the faster wheel.

#10. Commercial passenger aircraft oleo struts employ?

Air.

Nitrogen.

Helum.

Halon.

#11. Fusible plugs react to?

High pressures.

High temperatures.

Low pressures.

Low temperatures.

#12. Shimmy is a potentially damaging oscillation that occurs when?

Landing gear is retracted.

Landing gear is extended.

Moving at low speeds on the ground.

Moving at high speeds on the ground.

#13. A tubed tyre is …………. compared to a tubeless tyre? 1.Gets hotter. 2.Is more resistant to blow outs. 3.Is more permeable. 4.Is less likely to tear out the valve during landings.

1,2,3.

2,3,4.

1,2,4.

All of the above.

#14. Which of the following sequences best describes the diagram below?

Cantilever, fork, twin, half fork.

Twin fork, cantilever, fork, half fork.

Twin, fork, half fork, cantilever.

Twin fork, fork, half fork, cantilever.

#15. The majority of modern transport aircraft use …….brake units?

Drum.

Multi drum.

Disc.

Multi disc.

#16. The indication for gear down and locked is/

All lights out.

Three reds.

Three greens.

Gear down caption illuminated.

#17. The principle of an anti-lock braking system is?

Increase breaking force on slowest wheel.

Increase breaking force on fastest wheel.

Remove breaking force from stopped wheels.

Constant braking force to all wheels.

#18. Power for the landing gear is usually provided by means of?

HP Pneumatic systems.

DC electrics.

AC electrics.

HP hydraulics.

#19. Emergency landing gear extension in modern passenger aircraft is usually powered by?

Essential services AC busbar.

Essential services DC busbar.

Stored HP air.

Gravity.

#20. Over heating of the wheel brakes is indicated by?

EFIS PFD.

EFIS ND.

EICAS or ECAM.

Red gear lights.

#21. A tyre inflated to 3.5 bars will hydroplane at?

56 Kts when the grooves are half filled with water.

56 Kts when the grooves are filled with water.

126 Kts when the grooves are half filled with water.

126 Kts when the grooves are filled with water.

#22. Which of the following best represents the effects of shimmy?

#23. Shimmy is often prevented in light aircraft with single nose wheels by?

A marstrand tyre.

Shimmy dampers.

Power steering.

Non-castoring nose wheel.

#24. Shimmy is often prevented in light single nose wheel aircraft by?

A trailing nose wheel.

Shimmy dampers.

Power dampers.

Non-castoring nose wheel

Due to the flexibility of tyre side walls, an unstable, rapid sinusoidal oscillation or vibration
known as shimmy is induced into the nose undercarriage.
Excessive shimmy, especially at high speeds, can set up vibrations throughout the aircraft and
can be dangerous.
Worn or broken torque links, wear in the wheel bearings and uneven tyre pressures can all
increase the tendency to shimmy.
Shimmy can be reduced in several ways:
• Provision of a hydraulic lock across the steering jack piston.
• Fitting a hydraulic damper.(shimmy damper)
• Fitting heavy self-centring springs.
• Double nose wheels.
• Twin contact wheels.

#25. A marstrand tyre must be replaced when it is worn to?

The bottom the bracing plies.

The top the bracing plies.

The bottom the indicator grooves.

The bottom the central groove.

#26. Carbon fibre disc brakes are most efficient?

At low ambient temperatures.

At high ambient temperatures.

When hot.

When wet.

#27. Inadvertent gear selection in flight is prevented in light aircraft by?

Squat switches.

Ground locks.

Micro-switches.

Detented selector levers.

#28. Single acting hydraulic actuators are used for?

Gear retraction.

Gear extension.

Nose wheel steering.

Brakes.

#29. The recommended maximum taxiing speed to reduce tyre wear is?

20 Kts.

22 Kts.

30 Kts.

45 Kts.

#30. Wheel fires should be extinguished with?

Any type of extinguisher.

Water to cool the brakes.

Dry powder.

CO² or BCF.

#31. Wheel fires?

Should not be approached under any circumstances.

Should be approached from the side to avoid being run over by the aircraft.

Should be approached from the front or rear.

Should be approached by the shortest route.

#32. Excessive wearing of the shoulders of a tyre indicates?

Hydroplaning.

Skidding.

Over inflation.

Under inflation.

#33. Excessive wearing of centre of a tyre indicates?

Hydroplaning.

Skidding.

Over inflation.

Under inflation.

#34. Inadvertent gear retraction in large aircraft when on the ground is prevented by?

Detented selector levers.

Squat switches.

The weight of the aircraft.

Warning placards and indicator lights.

#35. The valve illustrated is used to?

Reduce gear extension rate.

Prevent inadvertent gear operation.

Reduce gear retraction rate.

Operate gear in the correct sequence.

#36. The device which ensures that gear doors are open before the gear is raised is a?

Micro-switch.

Squat switch.

Sequence valve.

One way restrictor valve.

#37. Unlocked gear is indicated by?

Audible warnings.

Red lights.

Green lights.

Flashing red lights.

#38. Emergency gear extension in large aircraft is typically by means of?

High pressure oxygen.

High pressure nitrogen or gravity.

Hand pump.

RAT.

#39. Gear collapse on the ground is prevented by?

Bracing struts and down locks.

Torque links.

Micro-switches.

The weight of the aircraft.

#40. Gear locked down is indicated by?

Gear lights extinguished.

Red lights.

Green lights.

Flashing red lights.

#41. Tyre or wheel failure due to excessive pressures when hot is prevented by?

Blow out panels.

Weak beads.

Thermal plugs.

The tyre relief valves.

#42. Brake adjusters?

Keep pads in contact with the discs.

Prevent contact between pads and discs.

Keep discs centrally located.

Maintain correct gap between pads and discs.

#43. A differential brake system?

Applies different forces to the nose and wheel brakes to keep the aircraft track straight.

Applies different forces to the wheel brakes depending on the forces applied by the to the foot pedals.

Has a parking brake lever for each main wheel.

Is used only in light aircraft.

#44. Gear locked up is indicated by?

Gear lights extinguished.

Red lights.

Green lights.

Flashing red lights.

#45. Shimmy may be an indication of ?

Early rotation during take-off.

Late rotation during take-off.

Broken torque link.

Defective brakes.

#46. Auto-braking?

Applies a greater braking force than the pilot could.

Applies a lesser braking force than the pilot could.

Applies the brakes prior to touch-down.

Applies the brakes only when the wheels are skidding.

#47. Anti-skid systems?

Improve take-off performance.

Improve landing performance.

Improve both take-off and landing performance.

Do not affect take-off or landing performance.

#48. Anti-skid is operational when?

The wheels are on the ground.

The wheels are on the ground and ground speed is greater than 20 mph.

Landing gear is down and locked.

At all times when selected on.

#49. Brake indications in large aircraft typically include?

Temperature, system pressure, wear and anti-skid condition.

Temperature and anti-skid condition.

Wear and anti-skid condition.

Temperature, system pressure and anti-skid condition.

#50. Braking is most effective when the wheels are?

Stopped.

Spinning at high speed.

Just about to skid.

Skidding but still spinning slowly.

#51. Emergency air bottles are sometimes used to?

Retract and lower gear after hydraulic failure.

Retract gear after hydraulic failure.

Extend gear after hydraulic failure

Operate wheel brakes after hydraulic failure.

#52. A red light on the landing gear panel indicates?

One leg is locked down.

One leg is locked up.

One leg is unlocked.

One leg is up but unlocked

#53. Why must CO2 not be used to extinguish wheel brake fires?

It will corrode the brake discs.

It will crack the brake discs.

It will cause the wheels to explode.

It will not extinguish burning rubber.

#54. Brake fade is caused by?

Ingress of water between pads and discs.

Over heating of pads.

Melting of discs.

Boiling of hydraulic fluid.

#55. Wheel brakes?

Absorb thermal energy and convert it into friction.

Absorb kinetic energy and convert it into friction.

Absorb kinetic energy and convert it into thermal energy.

Absorb friction energy and convert it into kinetic energy.

#56. Excessive use of brake is likely to cause?

Rapid tyre deflation.

Boiling of brake fluid.

Slow tyre deflation.

Tyre bursting.

#57. Shimmy is?

Rapid oscillations of the main wheels about their axles.

Rapid oscillations of the nose wheels about its vertical axis.

Slow oscillations of the main wheels about their bogies.

Slow vertical oscillations of the nose wheels.

#58. Creep?

Is rotational movement of the brake discs when pressure is low.

Is rotational movement of the tyre around the wheel rim.

Is caused by excessive tyre pressures.

Does not happen with tubed tyres.

#59. Creep?

Is not important with tubeless tyres.

Is not important with tubed tyres.

Can caused valve pull out in tubed tyres.

Can cause valve pull out in tubeless tyres.

#60. Creep is indicated by?

Green spots on the tyre walls.

White lines on the tyre walls and wheel rims.

Red dots on wheels and tyre walls.

Tearing of the tyre sidewall rubber.

#61. One way restrictors in gear operating systems?

Restrict retraction rate to prevent impact damage with the fuselag

Restrict extension rate to prevent damage to gear stops and attachment.

Restrict both extension and retraction rates to prevent damage.

Restrict retraction rate in the event of a burst hydraulic pipe.

#62. Brake fade is most commonly caused by?

Overheating during landing run.

Over-cooling in flight.

Excessive pressure in the main hydraulic system.

Excessive oil or grease on the brake drums and pads.

#63. After taking-off from a slush contaminated surface?

The gear should be left down for a period to blow away the slush.

The gear should be raised immediately to prevent the slush from freezing.

The gear should be exercised up and down.

The flight should be aborted until the gear can be inspected for damage.

#64. Shimmy dampers?

Prevent nose wheel oscillations in flight with gear retracted.

Prevent nose wheel oscillations in flight with gear extended.

Prevent nose wheel oscillations when manoeuvring on the ground.

Prevent main wheel bogie oscillations during retraction and extension.

#65. Light aircraft nose wheel steering is usually by?

Pneumatic power.

Hydraulic power.

Electrical power.

Push-Pull rods.

#66. Creep is most likely to occur with?

Worn tyres.

Over inflated tyres.

Newly fitted tyres.

Marstrand tyres.

#67. Inflating tyres with the weight of the aircraft on its wheels?

Is not permitted.

Is normal and requires no special allowances.

Is normal but requires an allowance of 4% to be added to required pressures.

Is not possible because of the very high pressures that would be required.

#68. Brake dragging is caused by?

The pilot keeping his toes on the pedals in flight.

Air trapped in the brake hydraulic system.

Excessive main hydraulic system pressure.

Worn brake pads or shoes.

#69. The most probable cause of excessive shock absorber extensions is?

Low ambient temperatures.

High ambient temperatures.

Excessive fluid or gas charge.

C of G at limits of allowable range.

#70. An illuminated truck light means that?

The main gear trucks are in the correct position for retraction.

The main gear trucks are in the retracted position.

One main gear trucks is in the wrong position for retraction.

One main gear trucks is in the wrong position for extension.

#71. Anti-skid?

Prevents wheels locking when taking -off.

Prevents wheels locking when landing.

Prevents wheels locking when landing and prevents brake application during the approach to land.

Operates only in contaminated or wet runway conditions.

#72. Tyre scrubbing?

Can be prevented by ensuring minimum possible turn radius when taxiing.

Can be avoided by ensuring minimum turn radius is not exceeded during push back.

By always using the anti-skid system.

Is essential after using contaminated surfaces.

#73. If a brake wear indicator is not provided, wear is measured by?

The distance between the pads and disc with brakes off.

The distance between the calliper and the nearest pad with brakes on.

The distance between pistons and discs with brakes off.

The thickness of the discs.

#74. Awl holes?

Permit the escape of trapped air from tubed tyres.

Permit the escape of trapped air from within tubeless tyres.

Require immediate replacement of tyres.

Are indicated by white spots.

#75. Following an over weight landing on a short runway?

All wheels must be replaced.

The aircraft must be parked with brakes applied to allow them to cool.

The aircraft must be parked with brakes off to allow them to cool

The brake pads must be replaced.

#76. If a tyre is worn to the bottom of its grooves?

It cannot be repaired.

It can be repaired.

Both the wheel and tyre must be scrapped.

It can be repaired but only once.

#77. The auto brake system is disengaged?

Manually.

Automatically when the aircraft stops.

Automatically at 75 Kts.

Automatically at taxi sped (22 KTS).

#78. Following an overweight landing on a short runway, what aspects of the gear must be checked?

Brake temperatures

Tyre pressures.

Tyre condition.

Brake wear indicators.

#79. Anti-skid systems?

Prevent skidding on slush, snow and ice.

Prevent wheels from locking when carrying out an RTO.

Improve both take-off and landing performance.

All of the above.

#80. Nose wheel shimmy might be exacerbated by?

Defective brakes.

Low taxi speeds.

High take-off mass.

Worn torque links.

#81. Grey or Green dots on tyre sidewalls indicate?

The heaviest part of the tyre.

The lightest part of the tyre.

Small holes to dissipate trapped air.

Small holes caused by trapped air.

#82. Tyre design and construction can affect?

VMCG.

VMCL

VMBE.

V1.

#83. Brake system design and construction can affect?

VMCG.

VMCL.

VMBE.

VR.

#84. A block tread type tyre is worn out when?

The centre groove is worn away.

The tread depths is 1.6 mm.

The tread pattern is just visible at the most worn areas.

The tread pattern is just visible at the least worn areas.

#85. Scuff marks on tyre indicates?

Taxi turn radii to great.

Taxi turn radii to small.

Skidding on landing.

Excessive taxiing speed.

#86. Shimmy dampers are fitted to?

Main gear only.

Main and nose gear.

Nose gear only.

Non-steerable nose gear only.

#87. Braking systems in large transport airgraft are powered by?

The pilot's toe pedals.

The landing gear hydraulic system.

The main and stand by hydraulic systems.

Pneumatic(vacuum) systems.

#88. Nose wheel steering in light aircraft is by?

Pneumatic power.

Hydraulic power.

Push-pull rods connected to a small streeing wheel.

Push-pull rods connected to the rudder bar.

#89. If emergency gear extension is provide by compressed air it will be activated by means of?

The gear selector lever.

A separate gear selector lever.

A gated gear selector lever and a huttle valve.

A shuttle valve.

#90. Creep?

Affects only tubeless tyres.

Affects only tubed tyres.

Can tear out the valves of tubeless tyres.

Can tear out the valves of tubeed tyres.

#91. Creep?

Is normal after a tyre has been in use for some time.

Is normal after a tyre is first fitted.

Is not related to time since fitting.

Must not occur within the first 25 landings after fitting.

#92. For an aircraft with tyre pressures of 150 psi landing on a wet runway Vp will be?

94.3 Kts.

92.3 Kts.

110.2 Kts.

101.2 Kts.

#93. For an aircraft with tyre pressures of 150 psi landing on x runway contaminated with wet snow (SG=0.5)Vp will be?

158.6 Kts.

188.6 Kts.

94.3 Kts.

79.3 Kts.

#94. For an aircraft with tyre pressures of 150 psi taking off from a wet runway Vp will be?

94.3 Kts.

92.3 Kts.

110.2 Kts.

120.2 Kts.

#95. From an aircraft with tyre pressures of 150 psi taking-off from a runway contaminated with wet snow (SG=0.5)Vp will be?

202.5 Kts.

220.5 Kts.

188.6 Kts.

108.6 Kts.

#96. If tyre pressure is 225 psi, its aquaplaning speed will be?

105 Kts.

115 Kts.

125 Kts.

135 Kts.

#97. Inadvertent gear retraction on the ground is prevented by?

Gravity.

Safety pins.

Ground/air logic system.

A gated or guarded gear lever.

#98. Tyre creep is most common on?

New tyres.

Tubeless tyres.

Used tyres.

Tubed tyres.

#99. By what % must the normal inflation pressure be adjusted when inflating tyres with the aircraft weight on the wheels?

-4.

-12.

+4.

+12.

#100. Excessively tight turns when taxiing will?

Scuff tyres.

Scrub tyres.

Creep tyres.

Not affect.

#101. Brake dragging is most likely to occur when?

Pads are worn out and brakes are cold.

Discs are worn out and brakes are hot.

Discs are warped and brakes are cold.

Air is trapped in the system and brakes are hot.

Finish