Landing Gear, Wheels, And Brakes

Question 1

Type of strut

Answer 1

Conventional oleo-pneumatic

Question 2

Method of gear retraction and extension

Answer 2

Hydraulic power

Question 3

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

Answer 3

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

Question 4

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

Answer 4

Springs

Question 5

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

Answer 5

3 greens: gear down and locked

Red: gear in transit/ neither locked down nor up

Question 6

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

Answer 6

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

Question 7

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

Answer 7

15cm and 4cm respectively

Question 8

Tyre pressure of nose and main wheels

Answer 8

6 bar and 4.5 bar respectively

Question 9

Max nose wheel deflection with and without differential braking

Answer 9

With: 52 deg
Without: 30 deg

Question 10

Turning circle with and without differential braking

Answer 10

6m and 9.5m

Question 11

What happens to nosewheel steering upon retraction

Answer 11

Steering linkage disengaged to reduce rudder pedal loads

Question 12

Braking system is….

Answer 12

Hydraulic

n.b. Separate system from gear hydraulics

Question 13

Where is hydraulic fluid for braking stored

Answer 13

2 reservoirs attached to co-pilots brake pedal actuators

Question 14

How does parking brake work

Answer 14

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

Question 15

How is hydraulic pressure applied to the gear

Answer 15

Each gear assembly has an actuator

Question 16

How is constant system pressure maintained during actuator operation

Answer 16

A pressurised gas container (accumulator) maintains constant system pressure

Question 17

How long does normal gear extension take

Answer 17

6-10 seconds

Question 18

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

Answer 18

Springs, by holding down lock hooks in place once engaged

Question 19

How does retraction take place

Answer 19

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

Question 20

What prevents ground retraction

Answer 20

Left squat switch

Question 21

What holds the gear in the retracted position

Answer 21

Hydraulic pressure, primarily from the accumulator

Question 22

How does emergency gear extension work

Answer 22

Releases hydraulic pressure to allow gear to fall due to gravity

Question 23

When will the landing gear warning sound

Answer 23

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