Gear/Brakes

Question 1

What type of brakes are installed on the Global 7500?

Answer 1

Carbon disks (4 per wheel)

Question 2

How are the wheel brakes powered and actuated?

Answer 2

Electrohydraulic brake-by-wire control system

Question 3

How is weight-on-wheels sensing accomplished?

Answer 3

Via 6 proximity sensors total, 2 mounted on each gear

Question 4

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

Answer 4

Electrically controlled by the landing gear and steering control unit (LGSCU)

Question 5

Which hydraulic systems operate the landing gear?

Answer 5

Hydraulic systems 2 and 3

Question 6

How is excessive air pressure due to heat build-up in the main wheel/tire assembly released?

Answer 6

Four heat-sensitive fuse plugs on each MLG wheel

Question 7

How is a main landing gear overheat condition detected in the gear bays?

Answer 7

Single-loop heat sensing elements

Question 8

How are the main landing gear doors operated?

Answer 8

Outboard doors are attached to the gear
Inboard doors are operated by a hydraulic actuator powered by hydraulic system 2

Question 9

How are the nose gear forward and aft doors normally actuated?

Answer 9

Forward doors are operated by a hydraulic actuator
Aft door is attached to the gear

Question 10

How are the gear doors opened for gear bay inspection on the ground?

Answer 10

With the LG PULL handle in the flight compartment

Question 11

How are the gear doors closed after the gear bays have been inspected on the ground?

Answer 11

The LG manual release handle is returned to the normal position
Number 2 hydraulic system pressure is applied
Press and hold the GEAR DOOR CLOSE pushbutton on the forward external service panel until all gear doors are closed

Question 12

When is the “Too Low Gear” warning sounded?

Answer 12

Any landing gear is not down and locked, and
Radio altimeter less than 500ft AGL, and
Less than 190kt
Note: This is part of the TAWS system

Question 13

When is the gear aural warning mutable?

Answer 13

Any gear is not down and locked, and
Both thrust lever angles (TLAs) set to approach, and
Both radio altimeters invalid, and
Below 16,500ft

Question 14

What happens when the LG manual release handle is pulled?

Answer 14

Shutoff and dump valves mechanically opened
Uplocks for both MLG doors release
Both MLG uplocks release
NLG door uplock releases
NLG uplock releases
Alternate power valve is mechanically opened to pressurize the downside of the MLG retraction
actuators to assist free fall

Question 15

After a manual landing gear extension, which caution CAS messages are displayed?

Answer 15

L MAIN GEAR DOOR
R MAIN GEAR DOOR
NOSE GEAR DOOR

Question 16

How will the NWS operate after manual gear extension?

Answer 16

Free-caster mode
Note: this assumes you have followed the checklist and placed the NWS switch in OFF

Question 17

How is the NWS system controlled and actuated?

Answer 17

Electrically controlled
Hydraulically actuated (HYD system 2)

Question 18

What are the NWS limits for the Tiller and Rudder?

Answer 18

Tiller ±82.5°
Rudder ±9°

Question 19

What is recommended to be done to the nose gear before towing operations?

Answer 19

Disconnect the nosewheel steering torque links
Disconnect and stow the tire pressure lead

Question 20

How are the brake wear indicator pins normally checked?

Answer 20

Parking brake set or
Pedal brake application applied with Hydraulic systems 2 and 3 pressurized

Question 21

Which brakes operate from the PARK/EMER handle?

Answer 21

All four brakes

Question 22

Which hydraulic system operates the brakes when using the PARK/EMER handle?

Answer 22

Systems 2 and 3

Question 23

Which hydraulic systems operate the normal brake system?

Answer 23

Hydraulic system 2 (outboard brakes)
Hydraulic system 3 (inboard brakes)

Question 24

How is the PARK/EMER brake actuated?

Answer 24

Mechanical linkages to the parking brake valve
Note: this system is completely mechanical. It will operate in flight.

Question 24

If selected on, under what conditions will the autobrake disarm?

Answer 24

AUTOBRAKE rotary switch selected to OFF or RTO
Brake pedal application greater than 20%
Failure of the BCS or loss of critical input data to BCU from other airplane systems

Question 25

When will the autobrake RTO function be applied?

Answer 25

The autobrake rotary switch is enabled in RTO
Speed above 60kt
Engine thrust levers are at idle or
Thrust reversers are applied