Landing Gear and Brakes

Question 1

NWS limits for the tiller and rudder?

Answer 1

Tiller ±75º, rudder ±7.5º

Question 2

How should brake wear indications be checked?

Answer 2

Parking brake applied and HYD SYS 3 pressurized

Question 3

When is gear warning horn mutable?

Answer 3

In secondary mode with one throttle idle

Question 4

Function of gear warning HORN switch?

Answer 4

Disable gear warning under certain airplane configurations

Question 5

Max airspeed with landing gear extended?

Answer 5

250KIAS/0.7 M

Question 6

Max operating airspeed for extending/retracting landing gear?

Answer 6

200KIAS

Question 7

Which single HYD SYS for all aspects of nose gear operations?

Answer 7

HYD SYS 3

Question 8

HYD SYS(s) that operates the normal landing gear extension/retraction?

Answer 8

HYD SYS 2 and 3

Question 9

How is excessive air pressure due to heat buildup in main wheel/tire assembly released?

Answer 9

Four heat sensitive fuse plugs

Question 10

How are main gear inboard doors normally operated?

Answer 10

HYD SYS 3

Question 11

Recommended actions to nose gear for all towing operations?

Answer 11

Disconnect the nose wheel steering torque links

Question 12

What conditions cause the auto brake to disarm?

Answer 12

Brake pedal application >20%, autobrake switch selected off, autobrake or BCU system fault, wheel speed invalid, ground spoilers stowed after being deployed

Question 13

How is NWS controlled and actuated?

Answer 13

Electrically controlled and hydraulically actuated?

Question 14

How is NWS steering operated after manual gear extension?

Answer 14

Free caster mode

Question 15

How are the brakes controlled and actuated?

Answer 15

Electrically controlled and hydraulically actuated

Question 16

How is weight on wheels(WOW) sensing accomplished?

Answer 16

Two proximity sensors on each main and nose gear assembly

Question 17

Max operating altitude with landing gear extended?

Answer 17

20,000ft

Question 18

How is main landing gear overheat detected?

Answer 18

Single loop heat sensing elements

Question 19

Which HYD SYS operates the braking system?

Answer 19

HYD SYS 2(outboard brakes), HYD SYS 3(inboard and parking/emer brake system)

Question 20

The 3 conditions where gear warning horn is not mutable?

Answer 20

When activated by flap position, both throttles idle, radio altimeter(s) valid

Question 21

What are the two operating modes of the gear warning horn system?

Answer 21

Primary(operable rad alt) and secondary(below 16,500ft and no serviceable rad alt)

Question 22

How is BRAKE OVHT warning message removed from EICAS if the condition no longer exists?

Answer 22

Momentarily pressing the BTMS OVHT WARN RESET

Question 23

How is normal extension and retraction of the landing gear controlled?

Answer 23

Electrically controlled by the landing gear electronic control unit (LGECU)

Question 24

After manual landing gear extension, which gear door caution messages remain displayed?

Answer 24

L-R MAIN GEAR DOOR, NOSE DOOR

Question 25

How is the park/emergency brake actuated?

Answer 25

Mechanical linkages transfer manual inputs from the parking brake lever to the parking brake valve

Question 26

Autobrake at LOW, MED or HI, what two conditions must be met to activate the auto brake system?

Answer 26

Both MLG indicate WOW for >5 secs or wheel spin up >50 KIAS and the ground spoilers are commanded to deploy

Question 27

What type of brakes are used on the Global Express aircraft?

Answer 27

Carbon disc brakes

Question 28

What is the sequence of events that occur during manual landing gear extension?

Answer 28

Mechanical release of all LG unlocks and gear doors. SYS 3 shutoff valves block HYD pressure operating the gear uplocks and doors, dump valve opens transferring SYS3 pressure from gear and doors to return. SYS2 pressure assists in main door downlock

Question 29

What is meant by the term brake by wire?

Answer 29

Rudder pedal braking input is converted to an electrical signal (transducers) and sent to the brake control unit (BCU)