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DA42 TECHNICAL KNOWLEDGE > Landing Gear, Wheels, And Brakes > Flashcards

Landing Gear, Wheels, And Brakes Flashcards

1
Q

Type of strut

A

Conventional oleo-pneumatic

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2
Q

Method of gear retraction and extension

A

Hydraulic power

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3
Q

How is hydraulic pressure supplied, and when does this system operate

A

Electric pump controlled by a pressure switch, only operates when system pressure falls below a set value

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4
Q

What other than hydraulics assists the extension and locking of the gear

A

Springs

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5
Q

What do 3 greens
And red
Mean in relation to the landing gear

A

3 greens: gear down and locked

Red: gear in transit/ neither locked down nor up

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6
Q

Type of brakes, which wheel are they attached to, and how are they operated

A

Hydraulic disk brakes, attached to main wheels, operated via toe brakes

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7
Q

Amount of strut that should be visible on the nose and main gear

A

15cm and 4cm respectively

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8
Q

Tyre pressure of nose and main wheels

A

6 bar and 4.5 bar respectively

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9
Q

Max nose wheel deflection with and without differential braking

A

With: 52 deg
Without: 30 deg

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10
Q

Turning circle with and without differential braking

A

6m and 9.5m

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11
Q

What happens to nosewheel steering upon retraction

A

Steering linkage disengaged to reduce rudder pedal loads

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12
Q

Braking system is….

A

Hydraulic

n.b. Separate system from gear hydraulics

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13
Q

Where is hydraulic fluid for braking stored

A

2 reservoirs attached to co-pilots brake pedal actuators

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14
Q

How does parking brake work

A

Once engaged and hydraulic pressure applied (by pumping brakes) stops hydraulic pressure from dissipating away from brake disks

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15
Q

How is hydraulic pressure applied to the gear

A

Each gear assembly has an actuator

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16
Q

How is constant system pressure maintained during actuator operation

A

A pressurised gas container (accumulator) maintains constant system pressure

17
Q

How long does normal gear extension take

A

6-10 seconds

18
Q

What assists hydraulic pressure in extension and locking down of the gear

A

Springs, by holding down lock hooks in place once engaged

19
Q

How does retraction take place

A

Hydraulic pressure flows to both sides of actuator. Since retraction side has larger surface area, fluid flows from the extension side and the gear retracts

20
Q

What prevents ground retraction

A

Left squat switch

21
Q

What holds the gear in the retracted position

A

Hydraulic pressure, primarily from the accumulator

22
Q

How does emergency gear extension work

A

Releases hydraulic pressure to allow gear to fall due to gravity

23
Q

When will the landing gear warning sound

A

When airborne if either power lever is reduced below 25% when gear is not locked down
Or
Flaps are set LDG but gear is up

DA42 TECHNICAL KNOWLEDGE (14 decks)

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