The abs auto brake system is being disconnected after landing ? [ Session helipad ]

Question 21-1 : By pilot action automatically at a certain low speed the system is always armed

exemple 121 By pilot action. — Img837. 1 auto brake disarm light . illuminated amber . speed brake lever moved to down detent during rto or landing. manual brakes applied during rto or landing. thrust lever s advanced during rto or landing. except during first 3 seconds after touchdown for landing. landing made with rto selected. rto mode selected on ground. illuminates for one to two seconds then extinguishes. a malfunction exists in automatic braking system . extinguished . auto brake select switch set to off. autobrake armed .. 2 auto brake select switch .off autobrake system deactivated . 1 2 3 or max . selects desired deceleration rate for landing. switch must be pulled out to select max deceleration .rto automatically applies maximum brake pressure when thrust levers are retarded to idle at or above 90 knots .. 3 antiskid inoperative antiskid inop light .illuminated amber a system fault is detected by antiskid monitoring system .extinguished antiskid system operating normally By pilot action.

The purposes of the oil and the nitrogen in an oleo pneumatic strut are ?

Question 21-2 : The oil supplies the damping function and the nitrogen supplies the spring function the oil supplies the spring function and the nitrogen supplies the damping function the oil supplies the sealing and lubrication function the nitrogen supplies the damping function the oil supplies the damping and lubrication function the nitrogen supplies the heat dissipation function

exemple 125 The oil supplies the damping function and the nitrogen supplies the spring function — The oil supplies the damping function and the nitrogen supplies the spring function

The highest load on the torsion link in a bogie gear is ?

Question 21-3 : Whilst turning on the ground with a small radius on touch down with a strong crosswind when gear is selected down when braking with an inoperative anti skid system

exemple 129 Whilst turning on the ground with a small radius. — Whilst turning on the ground with a small radius.

The function of a fusible plug is to ?

Question 21-4 : Protect the tyre against explosion due to excessive temperature protect the brake against brake disk fusion due to excessive temperature function as a special circuit breaker in the electric system protect against excessive pressure in the pneumatic system

exemple 133 Protect the tyre against explosion due to excessive temperature. — Protect the tyre against explosion due to excessive temperature.

Compared to a tyre fitted with an inner tube a tubeless tyre presents the ?

Question 21-5 : 3 and 4 2 and 4 1 2 3 and 4 2 and 3

An under inflated tyre will ?

Question 21-6 : Experience increased wear at the shoulders be more subject to viscous aquaplaning have an increased hydroplaning speed experience reduced wear at the shoulders

exemple 141 Experience increased wear at the shoulders. — Img840 Experience increased wear at the shoulders.

A scissor torsion link is a component found on landing gears its function is to ?

Question 21-7 : Prevent any rotation of the oleo strut in the landing gear shock absorber make the body gears pivot when the nosewheel is turned through more than 20° transform the translational movement of the rudder pedals into the rotational movement of the nosewheel create the wheel pitch on bogie gears

exemple 145 Prevent any rotation of the oleo strut in the landing gear shock absorber. — The torque links prevent rotation about the vertical axis to maintain wheel alignment in the fore and aft direction throughout the vertical range of oleo travel in maintaining proper wheel alignment the torque links stabilize any torsional oscillations shimmy .by their design torque links have their maximum mechanical advantage and control when the oleo is compressed and minimum advantage when the oleo is fully extended . 671.sometime it doesn't work .vdo672 Prevent any rotation of the oleo strut in the landing gear shock absorber.

Associate the correct legend to each of the numbered diagrams . 841 ?

Question 21-8 : 1 cantilever 2 fork 3 half fork 4 dual wheels 1 half fork 2 single trace 3 cantilever 4 dual wheels 1 cantilever 2 dual wheels 3 half fork 4 fork 1 half fork 2 fork 3 cantilever 4 tandem

exemple 149 1- cantilever 2- fork 3- half fork 4- dual wheels — 1- cantilever 2- fork 3- half fork 4- dual wheels

The function of an accumulator in a hydraulic brake system is ?

Question 21-9 : To supply a limited amount of brake energy in the event of failure of the hydraulic system normally supplying the brakes a damping accumulator designed to damp fluctuations of the auto brake system to store the hydraulic energy recovered by the anti skid system preventing wheel locking to function as a buffer to assist the hydraulic system during heavy braking

exemple 153 To supply a limited amount of brake energy in the event of failure of the hydraulic system normally supplying the brakes. — To supply a limited amount of brake energy in the event of failure of the hydraulic system normally supplying the brakes.

A red or an amber light on an undercarriage position indicator signifies ?

Question 21-10 : At least one wheel is in the travelling or unlocked condition all wheels are up and locked all wheels are down and locked the landing has been selected down using the emergency extension system

exemple 157 At least one wheel is in the travelling or unlocked condition. — At least one wheel is in the travelling or unlocked condition.

In some aircraft there is a protection device to avoid the landing gear being ?

Question 21-11 : A latch located in the landing gear lever an aural warning horn a warning light which is activated by the wow weight on wheels sensor system a bolt

exemple 161 A latch located in the landing gear lever. — A latch located in the landing gear lever.

Overcentre mechanisms in landing gear systems are used to ?

Question 21-12 : Lock the landing gear in the up and/or down positions lock the landing gear in the up position only ensure that the nose wheel does not exceed the maximum steering arc ensure the nose wheel is positioned fore and aft prior to retraction

exemple 165 Lock the landing gear in the up and/or down positions. — That naturally depends on the type of aircraft main undercarriage units are locked down by mechanical and overcentre geometric locks hook locks are generally used for the up position Lock the landing gear in the up and/or down positions.

The systems used for emergency extension of landing systems may comprise .1 ?

Question 21-13 : 2 4 5 1 2 5 2 3 4 1 3 4

The working principle of the anti skid system is ?

Question 21-14 : Reduction of the brake pressure at the slower turning wheels reduction of the brake pressure at the faster turning wheels increase of the brake pressure at the faster turning wheels increase of the brake pressure at the slower turning wheels

exemple 173 Reduction of the brake pressure at the slower turning wheels. — Anti skid protection is provided to allow maximum braking efficiency which in turn minimizes landing distances if the pilot applies enough brake pedal force to cause slippage between the tires and the runway the wheel speed transducer data received by a control box will indicate a sudden deceleration for the slipping wheel the control box will determine the severity of the impending skid and send the appropriate current signal to the anti skid servo valve to reduce brake pressure accordingly dual servo valves reduce pressure for either brake independently .therefore a single wheel skid will result in the reduction of brake pressure at the skidding wheel only Reduction of the brake pressure at the slower turning wheels.

Vle is the maximum ?

Question 21-15 : Flight speed with landing gear down speed at which the landing gear can be operated with full safety speed with flaps extended in a given position stall speed

exemple 177 Flight speed with landing gear down. — Flight speed with landing gear down.

Vlo is the maximum ?

Question 21-16 : Speed at which the landing gear can be operated with full safety flight speed with landing gear down speed with flaps extended in a given position cruising speed not to be exceeded except in still air with caution

What is the correct statement about rudder deflection and steering nose ?

Question 21-17 : When performing a rudder check during taxiing an additional pilot action is required to avoid deflection of the nose wheel steering nose movement is completely achieved with rudder pedals as well as with the hand wheel controller for takeoff run the hand wheel controller is well suitable for controlling the aeroplane rudder deflection and steering movement are also interconnected during the flight

exemple 185 When performing a rudder check during taxiing, an additional pilot action is required to avoid deflection of the nose wheel. — Revised ecqb03 september 2016 ..during taxiing if the pilots want to use rudder pedals to check rudder deflection without interfering with steering they have a pushbutton on either steering hand wheel on the a320 or the tiller must be physically held so as to prevent the aircraft from turning for b737 .the hand wheel controller tiller is only suitable at the beginning of the take off roll on the a320 the effectiveness of the hand wheel is diminished above 20 kt and is canceled above 80 kt on the b737 the hand wheel controller was to be used under 60 kt When performing a rudder check during taxiing, an additional pilot action is required to avoid deflection of the nose wheel.

To avoid the risk of tyre burst from overheating there is ?

Question 21-18 : A thermal plug that deflates the tyre at a specific temperature the 'emergency burst' function of the anti skid system that adapts braking to the tyre temperature a pressure relief valve situated in the filler valve water injection triggered at a fixed temperature in order to lower tyre temperature

Which of these statements about an anti skid system are correct or incorrect .1 ?

Question 21-19 : 1 is incorrect 2 is correct 1 is correct 2 is incorrect 1 is incorrect 2 is incorrect 1 is correct 2 is correct

exemple 193 1) is incorrect, 2) is correct. — Ecqb03 september 2016 ..the 'regulation of slip ratio' function of an anti skid system ensures optimum braking performance in case of failure of the anti skid system the auto brake system can not take over the 'regulation of the slip ratio' .careful brake application by the pilot in case of anti skid failure can never achieve the same performance as a properly functioning anti skid system .the anti skid system through various mechanisms compares the speed of the aircraft with the rotational speed of each main wheel if the speed of any wheel is too slow for the existing aircraft speed the brake on that wheel or wheels is released momentarily to allow the wheel speed to increase and prevent the wheel from skidding the system is fully automatic and is active from immediately after initial wheel spin up on landing during which time brake activation might or might not be inhibited down to a design limited minimum speed usually about 15 kt .anti skid systems are designed to minimise aquaplaning and the potential tyre damage which can occur when a wheel is locked or rotating at a speed which does not correspond to the speed of the aircraft anti skid removes the possibility of reverted rubber skids caused by locked wheels an anti skid system also greatly improves stopping distance on substandard surfaces such as gravel or grass and is particularly effective on surfaces contaminated with frozen contaminants such as ice or slush by ensuring maximum effective breaking 1) is incorrect, 2) is correct.

Which of these statements about an anti skid system are correct or incorrect .1 ?

Question 21-20 : 1 is correct 2 is incorrect 1 is incorrect 2 is correct 1 is incorrect 2 is incorrect 1 is correct 2 is correct

exemple 197 1) is correct, 2) is incorrect. — Ecqb03 september 2016 ..the 'regulation of slip ratio' function of an anti skid system ensures optimum braking performance in case of failure of the anti skid system the auto brake system can not take over the 'regulation of the slip ratio' .careful brake application by the pilot in case of anti skid failure can never achieve the same performance as a properly functioning anti skid system .the anti skid system through various mechanisms compares the speed of the aircraft with the rotational speed of each main wheel if the speed of any wheel is too slow for the existing aircraft speed the brake on that wheel or wheels is released momentarily to allow the wheel speed to increase and prevent the wheel from skidding the system is fully automatic and is active from immediately after initial wheel spin up on landing during which time brake activation might or might not be inhibited down to a design limited minimum speed usually about 15 kt .anti skid systems are designed to minimise aquaplaning and the potential tyre damage which can occur when a wheel is locked or rotating at a speed which does not correspond to the speed of the aircraft anti skid removes the possibility of reverted rubber skids caused by locked wheels an anti skid system also greatly improves stopping distance on substandard surfaces such as gravel or grass and is particularly effective on surfaces contaminated with frozen contaminants such as ice or slush by ensuring maximum effective breaking 1) is correct, 2) is incorrect.

On the diagram the landing gear element indicated by the number 11 is . 842 ?

Question 21-21 : Bogie beam torque links bogie pitch trimmer retraction actuator

Which statement is correct concerning auto brake system ?

Question 21-22 : When using manual braking during taxiing the auto brake system remains armed when auto brake is inoperative the take off should not be allowed because manual braking does not support the loads of emergency braking when previously selected the landing distance will have a fixed value when being used auto brake ventilates the brake fans

exemple 205 When using manual braking during taxiing, the auto-brake system remains armed. — During rto or landing the auto brake system is automatically disconnected when using manual braking but not during taxiing .. 837. 1 auto brake disarm light . illuminated amber . speed brake lever moved to down detent during rto or landing. manual brakes applied during rto or landing. thrust lever s advanced during rto or landing. except during first 3 seconds after touchdown for landing. landing made with rto selected. rto mode selected on ground. illuminates for one to two seconds then extinguishes. a malfunction exists in automatic braking system . extinguished . auto brake select switch set to off. autobrake armed .. 2 auto brake select switch .off autobrake system deactivated . 1 2 3 or max . selects desired deceleration rate for landing. switch must be pulled out to select max deceleration .rto automatically applies maximum brake pressure when thrust levers are retarded to idle at or above 90 knots .. 3 antiskid inoperative antiskid inop light .illuminated amber a system fault is detected by antiskid monitoring system .extinguished antiskid system operating normally When using manual braking during taxiing, the auto-brake system remains armed.

Which of these statements about an anti skid system are correct or incorrect .1 ?

Question 21-23 : 1 is correct 2 is correct 1 is incorrect 2 is correct 1 is correct 2 is incorrect 1 is incorrect 2 is incorrect

exemple 209 1) is correct, 2) is correct. — The 'regulation of slip ratio' function of an anti skid system ensures optimum braking performance in case of failure of the anti skid system the auto brake system can not take over the 'regulation of the slip ratio' .careful brake application by the pilot in case of anti skid failure can never achieve the same performance as a properly functioning anti skid system .the anti skid system through various mechanisms compares the speed of the aircraft with the rotational speed of each main wheel if the speed of any wheel is too slow for the existing aircraft speed the brake on that wheel or wheels is released momentarily to allow the wheel speed to increase and prevent the wheel from skidding the system is fully automatic and is active from immediately after initial wheel spin up on landing during which time brake activation might or might not be inhibited down to a design limited minimum speed usually about 15 kt .anti skid systems are designed to minimise aquaplaning and the potential tyre damage which can occur when a wheel is locked or rotating at a speed which does not correspond to the speed of the aircraft anti skid removes the possibility of reverted rubber skids caused by locked wheels an anti skid system also greatly improves stopping distance on substandard surfaces such as gravel or grass and is particularly effective on surfaces contaminated with frozen contaminants such as ice or slush by ensuring maximum effective breaking 1) is correct, 2) is correct.

Which of these statements about an anti skid system are correct or incorrect .1 ?

Question 21-24 : 1 is incorrect 2 is incorrect 1 is correct 2 is correct 1 is incorrect 2 is correct 1 is correct 2 is incorrect

exemple 213 1) is incorrect, 2) is incorrect. — The 'regulation of slip ratio' function of an anti skid system ensures optimum braking performance in case of failure of the anti skid system the auto brake system can not take over the 'regulation of the slip ratio' .careful brake application by the pilot in case of anti skid failure can never achieve the same performance as a properly functioning anti skid system .the anti skid system through various mechanisms compares the speed of the aircraft with the rotational speed of each main wheel if the speed of any wheel is too slow for the existing aircraft speed the brake on that wheel or wheels is released momentarily to allow the wheel speed to increase and prevent the wheel from skidding the system is fully automatic and is active from immediately after initial wheel spin up on landing during which time brake activation might or might not be inhibited down to a design limited minimum speed usually about 15 kt .anti skid systems are designed to minimise aquaplaning and the potential tyre damage which can occur when a wheel is locked or rotating at a speed which does not correspond to the speed of the aircraft anti skid removes the possibility of reverted rubber skids caused by locked wheels an anti skid system also greatly improves stopping distance on substandard surfaces such as gravel or grass and is particularly effective on surfaces contaminated with frozen contaminants such as ice or slush by ensuring maximum effective breaking 1) is incorrect, 2) is incorrect.

Which of these statements about an auto brake system are correct or incorrect ?

Question 21-25 : 1 is incorrect 2 is correct 1 is correct 2 is incorrect 1 is correct 2 is correct 1 is incorrect 2 is incorrect

exemple 217 1) is incorrect, 2) is correct. — Proper functioning of an auto brake system requires proper functioning of the anti skid system .in the rto rejected take off mode maximum anti skid braking is applied the 'regulation of slip ratio' function of an anti skid system ensures optimum braking performance using the rto mode provides the best stopping performance during a rejected take off the deceleration will not be constant it will increase as the speed decreases 1) is incorrect, 2) is correct.

At take off the rto mode rejected take off of an auto brake system disengages ?

Question 21-26 : When both air/ground systems indicate the 'air' mode from v1 at 80 kt by briefly pressing rudder pedals after takeoff

exemple 221 When both air/ground systems indicate the 'air' mode. — The rto mode is automatically disarmed when both air/ground systems indicate the air mode When both air/ground systems indicate the 'air' mode.

Rotor brake discs are manufactured from ?

Question 21-27 : Steel or carbon fibre aluminium or steel steel or titanium boron aluminide or titanium

exemple 225 Steel or carbon fibre. — Steel or carbon fibre.

On the diagram the landing gear element indicated by the number 3 is . fr a 021 ?

Question 21-28 : Shock absorber retraction actuator torque links bogie beam

exemple 229 Shock absorber. — Please download the diagram of a nose landing gear used as a reference at the exam .pdf654 Shock absorber.

If the anti skid system is inoperative may auto brake system can be used ?

Question 21-29 : No never without any limitation if selected to minimum only if full reverse thrust is used

exemple 233 No, never. — Ecqb04 october 2017..anti skid system protection is provided during auto brake operation therefore if anti skid is inoperative you can not use the auto brake system No, never.

Shimmy occurs on the nose wheel landing gear during taxiing when .1 the wheels ?

Question 21-30 : 1 4 1 3 2 4 2 3

exemple 237 1, 4. — .shimmy of aircraft nose wheel landing gear is a coupled lateral and torsional dynamic instability that may occur during take off taxi and landing .the potential for shimmy is often discovered when the aircraft undergoes taxi runway tests at this stage the options available to the designer are limited often to introducing a damper in the steering degree of freedom . >gxqnntxkyzm 1, 4.

Tyre 'creep' may be described as the ?

Question 21-31 : Circumferential movement of the tyre in relation to the wheel flange the increase in inflation pressure due to decrease in ambient temperature the decrease in inflation pressure due to increase in ambient temperature gradual circumferential increase of tyre wear

A single action actuator ?

Question 21-32 : Is powered in one direction only by hydraulic power the return movement being under spring force travels one direction under one application of hydraulic power and in the opposite direction under a second application of hydraulic power cannot be used for variable position operations as it is designed to lock in the extremities of travel is a one shot actuator used for emergency systems only

exemple 245 Is powered in one direction only by hydraulic power, the return movement being under spring force. — Is powered in one direction only by hydraulic power, the return movement being under spring force.

Axial piston pumps are often used in hydraulic systems due to ?

Question 21-33 : Their ability to produce high pressure when required but can be off loaded to reduce power consumption their low cost simplicity and durability their ability to produce high pressure combined with constant high flow rate the safety feature of the quill drive shearing due to pump seizure and the ease of repair by replacement of pump and shaft only

.high pressure and large flow are symptomatic of a hydraulic system axial piston pumps can produce high pressure but can be off loaded to reduce power consumption

The trim tab ?

Question 21-34 : Reduces hinge moment and control surface efficiency reduces hinge moment and increases control surface efficiency increases hinge moment and control surface efficiency increases hinge moment and reduces control surface efficiency

exemple 253 Reduces hinge moment and control surface efficiency. — The trim tab reduces hinge load because it uses the tab to move the control surface so there is no external load imposed by the pilot it reduces control surface effectiveness because it is using part of the control area for trimming leaving less for manoeuvre Reduces hinge moment and control surface efficiency.

The purpose of a trim tab device is to ?

Question 21-35 : Reduce or to cancel control forces trim the aeroplane during normal flight trim the aeroplane at low airspeed lower manoeuvring control forces

exemple 257 Reduce or to cancel control forces. — A trim tab is a small adjustable hinged surface on the trailing edge of the aileron rudder or elevator control surfaces trim tabs are labour saving devices that enable the pilot to release manual pressure on the primary controls . 845.some airplanes have trim tabs on all three control surfaces that are adjustable from the cockpit others have them only on the elevator and rudder and some have them only on the elevator some trim tabs are the ground adjustable type only .the tab is moved in the direction opposite that of the primary control surface to relieve pressure on the control wheel or rudder control for example consider the situation in which we wish to adjust the elevator trim for level flight 'level flight' is the attitude of the airplane that will maintain a constant altitude assume that back pressure is required on the control wheel to maintain level flight and that we wish to adjust the elevator trim tab to relieve this pressure since we are holding back pressure the elevator will be in the 'up' position the trim tab must then be adjusted downward so that the airflow striking the tab will hold the elevators in the desired position conversely if forward pressure is being held the elevators will be in the down position so the tab must be moved upward to relieve this pressure in this example we are talking about the tab itself and not the cockpit control . 846.rudder and aileron trim tabs operate on the same principle as the elevator trim tab to relieve pressure on the rudder pedals and sideward pressure on the control wheel respectively Reduce or to cancel control forces.

The advantages of fly by wire control are .1 reduction of the electric and ?

Question 21-36 : 3 and 5 1 and 2 1 and 5 2 and 3

exemple 261 3 and 5. — The power required to operate the control surfaces remains the same .fly by wire fbw is a system that replaces the conventional manual flight controls of an aircraft with an electronic interface the movements of flight controls are converted to electronic signals transmitted by wires hence the fly by wire term and flight control computers determine how to move the actuators at each control surface to provide the ordered response the fly by wire system also allows automatic signals sent by the aircraft's computers to perform functions with or without the pilot's input as in systems that automatically help stabilize the aircraft 3 and 5.

An artificial feel unit is necessary in the pitch channel when ?

Question 21-37 : The elevators are actuated by irreversible servo control units the elevators are actuated by reversible servo control units there is a trimmable stabilizer the elevators are fitted with servo tabs or trim tabs

exemple 265 The elevators are actuated by irreversible servo-control units. — Irreversible system fully powered system the pilot has no direct connection to the control surface he has no feel so an artificial feel system must be included this system works in parallel to the irreversible servo control unit .reversible system power assisted system similar to the power assisted steering for a car the pilot feel a part of the load he receives assistance from the hydraulic system to move the control surface The elevators are actuated by irreversible servo-control units.

An artificial feel system ?

Question 21-38 : Functions in parallel to an irreversible servo control unit is necessary in a reversible flight control actuator unit functions in series to an irreversible servo control unit is mounted in parallel on a spring tab

exemple 269 Functions in parallel to an irreversible servo-control unit. — Irreversible system fully powered system the pilot has no direct connection to the control surface he has no feel so an artificial feel system must be included this system works in parallel to the irreversible servo control unit .reversible system power assisted system similar to the power assisted steering for a car the pilot feel a part of the load he receives assistance from the hydraulic system to move the control surface Functions in parallel to an irreversible servo-control unit.

For most large aeroplanes spoilers are ?

Question 21-39 : Upper wing surface devices and their deflection can be symmetrical or asymmetrical lower wing surface devices and their deflection can be symmetrical or asymmetrical upper wing surface devices and their deflection is always asymmetrical lower wing surface devices and their deflection is always asymmetrical

exemple 273 Upper wing surface devices and their deflection can be symmetrical or asymmetrical. — Upper wing surface devices and their deflection can be symmetrical or asymmetrical.

A krueger flap is normally located at the ?

Question 21-40 : Leading edge trailing edge trailing edge close to the wing tip trailing edge close to the wing root

exemple 277 Leading edge. — Img847.a krueger flap is a leading edge flap and they are most of the time located at the wing root .krueger flap is high lift device it is hinged directly to the leading edge without any form of a slot Leading edge.

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