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C680 > Landing Gear & Brakes > Flashcards

Landing Gear & Brakes Flashcards

1
Q

What type of landing gear does the sovereign have?

A

The Soverign landing gear is a trailing-link tricycle gear design with dual wheels on both main gears and the nose.

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2
Q

How is nose wheel steering actuated?

A

NWS is hydraulically actuated through a tiller or the rudder pedals.

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3
Q

When is the red UNLOCK gear warning light illuminated?

A

When the gear position does not agree with the handle position.

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4
Q

Where is the blow down handle found?

A

A red blowdown handle is to the right of the center pedestal, below the landing gear handle.

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5
Q

Where is the nose gear release handle found?

A

It is the red “D” ring handle next to the gear blowdown knob.

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6
Q

Where is the main gear release lever found?

A

Below the lavatory closet.

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7
Q

Are the WHEEL BRAKES linked?

A

no. Each main wheel has an independent brake assembly receiving hydraulic pressure from the left and right toe pedals. Independent anti skid braking is available for each toe brake assembly, however the brakes can operate without anti skid.

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8
Q

is there a backup WHEEL BRAKES system?

A

yes. A pneumatic backup system is available for braking.

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9
Q

Where is the parking brake valve assembly found?

A

A parking brake valve assembly is downstream of the antiskid valves.

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10
Q

Discribe the ANTISKID PROTECTION.

A

Based on runway conditions, if enough brake pedal force is applied to result in a wheel skid, the antiskid system automatically removes the excess pressure to prevent a skid.
The protection allows for minimum stopping distance with out wheel skidding. Antiskid protection begins at landing when touchdown protection terminates.

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11
Q

Where is the EMERGENCY BRAKE HANDLE located?

A

A red emergency brake handle is below the left side electrical switch panel beside the center pedestal.

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12
Q

Where is the ANTI-SKID SWITCH located?

A

The anti-skid controller is electrically activated with the ANTI-SKID switch, located next to the landing gear handle.

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13
Q

Where is the NOSEWHEEL STEERING unit found?

A

A rack and pinion NWS unit is at the top of the nose gear assembly.

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14
Q

What type of backup system does the landing gear and brakes have?

A

The landing gear and brakes have a backup pneumatic system if all hydraulic pressure is lost. The landing gear has manual release mechanisms to extend the gear under gravity free fall.

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15
Q

How is the gear position or warnings indicated?

A

Gear position and warnings are provided by indicator lights and aural warnings.

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16
Q

Will you still have the ability to steer if there is a hydraulic failure?

A

Yes. An accumulator allows limited steering in the event of hydraulic failure.

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17
Q

What type of brake assembly does the Soverign have?

A

The main landing gear assembly are piston operated, multiple disc brake, carbon brake assemblies. Each assembly contains 5 pistons.

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18
Q

How many seconds does it normally take the landing gear to extend or retract?

A

Approximately 6 seconds are required to extend or retract the landing gear using the normal system.

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19
Q

What happens when the blowdown handle is pulled?

A

Pulling the handle releases nitrogen from the bottle into the landing gear hydraulic lines.

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20
Q

Can the gear blowdown handle be returned to its stowed position?

A

Yes.

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21
Q

What is the nose gear release handle used for?

A

It is used to manually pull the nose gear up lock away from the gear roller and allow the gear to free fall. This handle is used if the pneumatic method is unsuccessful.

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22
Q

What happens when the main gear release lever is pulled?

A

It pulls two cables, one for each main gear, manually disengaging the main gear unlocks from the gear rollers and allowing the gear to free fall. Use the lever if the pneumatic method is unsuccessful. The lever must be checked in its stowed position during cabin preflight.

23
Q

If the hydraulic brakes fail, is antiskid available?

A

No.

24
Q

How is the backup braking system activated?

A

By pulling the red emergency brake handle in the cockpit.

25
Q

Aircraft braking is available by the following methods: (4)

A

Normal: hydraulic brakes with antiskid.
Abnormal: hydraulic brakes without antiskid.
Emergency: pneumatic braking.
Parking: hydraulic fluid is trapped against the brakes by a one-way valve.

26
Q

What happens when the parking brake assembly is pulled?

A

When the parking brake assembly is pulled, the check valves within parking brake valve trap hydraulic fluid.

The parking brake assembly has thermal relief valves to accommodate pressure increases caused by fluid expansion after the brake is set.

27
Q

Why does the parking brake have thermal relief valves?

A

The parking brake has thermal relief valves to accommodate pressure increases caused by fluid expansion after the brake is set.

28
Q

How is the parking brake valve position monitored?

A

A position switch near the valve assembly monitors the valve position. Raising or unstowing the T handle from its full down position causes the valve to move and the appropriate CAS message is displayed.

29
Q

What happens when the emergency brake handle is pulled?

A

When the handle is pulled, a cable opens the spring loaded pneumatic bottle valve and releases a portion of nitrogen equally into all the brake lines. A single pull of the handle can be varied to attain more or less braking action.

30
Q

Which bus supplies power to the ANTISKID switch?

A

The emergency bus.

31
Q

What position does the antiskid switch normally remain on?

A

In the ON position.

32
Q

If the antiskid switch is in the ON position, what does that mean?

A

The antiskid controller and system are powered, and the BIT function is active.

33
Q

What happens when the antiskid switch is in the OFF position?

A

The antiskid system is deactivated.

34
Q

When is the antiskid switch OFF position used?

A

Only during malfunctions.

35
Q

When the antiskid switch is placed in the OFF position, what EICAS message is displayed?

A

An amber ANTISKID FAIL CAS message.

36
Q

How are the rudder and tiller connected to the steering unit?

A

The rudder pedals and tiller are connected to the unit with cables and pulleys.

37
Q

What happens when the rudder or tiller is used on the ground?

A

On the ground, use of the rudder pedals or tiller causes the steering unit to hydraulically turn the barrel of the shock strut left or right. Releasing the spring loaded tiller centers the nose gear.

38
Q

What is the gear blowdown handle connected to?

A

The handle and it’s cable connect to a discharge valve on top of the nitrogen bottle.

39
Q

What happens when the gear release handle is pulled?

A

Pulling the handle releases nitrogen from the bottle into the landing gear hydraulic lines. The handle can be returned to its stowed position.

40
Q

What prevents the heat generated by the brakes from damaging the wheels or tires?

A

Six heat shields.

41
Q

How many thermal fuse plugs are in each wheel assembly?

A

Three equally spaced thermal fuse plugs are in each wheel assembly.

42
Q

When will the thermal fuse plugs rupture?

A

At a predetermined temperature to prevent tire over inflation resulting from a brake over temperature condition.

43
Q

What design is the main gear oleo strut?

A

An air over oil design.

44
Q

Describe the function of the brake metering valve?

A

The toe brakes on top of each rudder pedals are connected to the brake metering valve by cables and springs.

Motion of the brake pedals is translated by the metering valve into proportional hydraulic pressure force on the respective wheel brake disks.

45
Q

Does the touchdown protection feature function during the emergency bus condition?

A

No.

The WOW modules are not powered during the emergency bus condition.

46
Q

How does the antiskid unit measure wheel rpm?

A

By using wheel transducers, one in each wheel axel.

47
Q

Describe the journey of the hydraulic fluid once it passes thru the brake metering valve.

A

Hydraulic pressure from the brake metering valve is sent to the antiskid control valves, where the pressure is allowed to the respective wheel brake assemblies for braking or returned.

The antiskid valve does not interfere with power braking unless the antiskid controller senses a skid developing.

The controller signals the ASV to reduce the amount of brake pressure applied by the pilot via the brake metering valve until the skid condition is corrected.

48
Q

To compute a braking wheel skid condition, the antiskid controller requires 4 things.

A
  1. Emergency bus power from anti-skid switch activation.
  2. Wheel speed inputs from the wheel transducers.
  3. Ground or air mode signals from the squat switches.
  4. landing/gear handle up/down position.
49
Q

What five functions are provided by the antiskid controller, during normal operations?

A
  1. Touchdown protection.
  2. Crossover protection.
  3. Antiskid protection.
  4. Main wheel spin-down protection.
  5. Built in test. (BIT)
50
Q

Describe touchdown protection.

A

Touchdown protection prevents tire damage if the pilot is holding the brakes as the aircraft touches down. It begins for all wheels simultaneously when both main gear squat switches signal air mode.

The antiskid protection deactivates touchdown protection after touchdown and normal braking then can be applied.

The Antiskid controller allows pilot braking when one of the following conditions are met:
Wheel transducers detect a wheel speed of a preset value or greater.
Any squat signal received for 3 secs.

Braking is applied after 3 seconds.

51
Q

Describe crossover protection.

A

Locked wheel crossover protection is provided as a backup to the primary antitrust circuit.

Crossover protection pairs outboard wheel with outboard wheel and inboard wheel with inboard wheel.

If a wheel slows to less than a predetermined value of its counterpart, the controller removes braking from that wheel. The command lasts as long as the difference remains.

Locked wheel protection drops out below a predetermined speed in knots to allow stopping at lower speeds.

52
Q

Describe the BIT function of the antiskid system.

A

With the landing gear down, the antiskid system monitors itself with a BIT feature by performing continuous integrity checks on the wheel speed transducers, antiskid control valve interfaces, and control unit power.

53
Q

Describe main wheel spin down protection.

A

When both main gear down locks are unlocked, touchdown protection is inhibited for a predetermined time value and the main wheel spin down feature stops wheel rotation prior to entering the wheel wells.

C680 (15 decks)

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