LANDING GEAR AND BRAKES

Question 1

What hydraulic system normally actuates gear extension and retraction?

Answer 1

No.2

Question 2

What does the gear lever electrically control?

Answer 2

Solenoid selector valve and sends signal to PSEU

Question 3

When is the gear lever locked?

Answer 3

Gear lever is locked up and down by the gear lever selector button.

Question 4

How are the gear doors operated?

Answer 4

Nose gear: fwd door hydraulic, rear linked to gear leg

Main gear: rear door hydraulically operated, centre linked to rear, fwd linked to gear

Question 5

How is the main gear locked up and down?

Answer 5

locked down with overcentre link, operated by the stabiliser actuator. locked up with mechanical uplock actuator, hydraulically released but can be manually released.

Question 6

How is the nose gear locked up and down?

Answer 6

Locked down by the drag strut, controlled by the drag strut actuator, same in the up position(over centre link)

Question 7

What do the green lights indicate?

Answer 7

The associated gear is down and locked.

Question 8

What do the red lights indicate?

Answer 8

The gear is neither locked up or down and the position of the lever and gear disagree. The light in the gear handle comes on when the position of the lever and gear disagree.

Question 9

What lights will illuminate when the landing gear is in transit?

Answer 9

Red gear lights aswell as the door lights.

Question 10

If the LDG GEAR INOP caution light illuminates, what is the problem?

Answer 10

The gear sequence valve has a malfunction and the normal extension must not be used.

Question 11

What pre-caution should be taken if the LDG GEAR INOP caution light is on?

Answer 11

Alternate extension procedure

Question 12

When will the landing gear warning horn sound? When can the landing gear warning horn be muted?

Answer 12

1: gear not down and locked, flap 15 or more, auto fx off, both pwr

Question 13

When can it not be muted?

Answer 13

1: gear not down and locked, flap 15 or more, auto fx off, both pwr

Question 14

What airspeed restriction is placed on alternate gear extension?

Answer 14

140kts

Question 15

What is the effect of opening the LANDING GEAR ALTERNATE RELEASE door?

Answer 15

Overhead door, bypasses normal extension circuit and exposes the main gear extension handle.

Question 16

What is the effect of opening the LANDING GEAR ALTERNATE EXTENSION panel?

Answer 16

closes the emergency selector valve, isolating the main gear from the system also exposes the nose gear extension handle, hand pump socket and gear lights

Question 17

Describe briefly the main gear alternate extension procedure?

Answer 17

Gear lever down, open both doors, pull handle from above, pump down if green lights not illuminated.

Question 18

How is the nose gear extended by alternate means?

Answer 18

Handle in floor pull

Question 19

What light indications confirm alternate gear extension?

Answer 19

3 greens on the selector panel and/or in the emergency gear indicator (taxi light off). 3 door lights

Question 20

Why should the gear lever be placed in the DOWN position for an alternate extension?

Answer 20

The gear inhibit only inhibit extension not retraction

Question 21

What does the PSEU control(gear)?

Answer 21

Sequencing of gear and doors during extension and retraction

Question 22

Through what range is nose-wheel steering operable.

Answer 22

7deg both ways with rudder and 60 deg with the tiller, can caster up to 120 deg both directions

Question 23

What happens if you exceed the nose-wheel steering range?

Answer 23

Nose steering caution light comes on and the wheel will caster.

Question 24

What does the NOSE STEERING caution light tell you?

Answer 24

The unit has failed, hydraulic pressure failed or greater than 60 deg deflection

Question 25

Is reverse taxiing approved? Can we steer whilst reversing?

Answer 25

Yes but no steering and only on paved surfaces max XW 10kts

Question 26

How is the nose wheel steering system armed?

Answer 26

Nose wheel steering switch on captains side console

Question 27

What hydraulic system supplies normal brakes?

Answer 27

No.1

Question 28

What hydraulic system supplies emergency brakes?

Answer 28

No.2

Question 29

With which braking system is the antiskid available?

Answer 29

No.1

Question 30

Explain what wheel speeds are critical to antiskid operation?

Answer 30

All wheel speeds are monitored and any deviation from the average is considered skidding. operational above 17kts

Question 31

What brings on an ANTI SKID caution light?

Answer 31

test switch or a malfunction or an off selection

Question 32

How is the anti-skid tested?

Answer 32

when it is switched on the caution lights must switch off within 6 seconds.

Question 33

What should the PARK BRAKE pressure gauge read after a No.1 hydraulic failure? What should the PARK BRAKE pressure gauge read after a No. 2 hydraulic failure?

Answer 33

No.2 system pressure, Accumulator pressure (1000PSI)

Question 34

With a fully charged brake accumulator and without No.2 system pressure; how many brake applications are available?

Answer 34

4

Question 35

Is differential braking available with emergency brakes?/ Is differential braking available with Normal brakes?

Answer 35

No, yes with normal.

Question 36

What is the function of the brake control valves in the normal braking system?

Answer 36

manually control flow of fluid to the anti skid valves

Question 37

What is the minimum park brake pressure required prior to engine start?

Answer 37

1500PSI, 2500PSI overnight

Question 38

Prior to engine start you notice that the park brake pressure is below minimum dispatch. How can we increase park brake available pressure prior to engine start?

Answer 38

Hand pump in right engine nacelle

Question 39

What does the take-off warning monitor?

Answer 39

``` Elevator trim flaps >15, <5 Condition lever not at max park brake set to park ECU not at TOP ```