Gear / Brakes Flashcards
What type of brakes are installed on the Global 7500?
Carbon disks (4 per wheel)
How are the wheel brakes powered and actuated?
Electrohydraulic brake-by-wire control system
How is weight-on-wheels sensing accomplished?
Via 6 proximity sensors total, 2 mounted on each gear
How is normal extension and retraction of the landing gear controlled?
Electrically controlled by the landing gear and steering control unit (LGSCU)
Which hydraulic systems operate the landing gear?
Hydraulic systems 2 and 3
How is excessive air pressure due to heat build-up in the main wheel/tire assembly released?
Four heat-sensitive fuse plugs on each MLG wheel
How is a main landing gear overheat condition detected in the gear bays?
Single-loop heat sensing elements
How are the main landing gear doors operated?
- Outboard doors are attached to the gear
- Inboard doors are operated by a hydraulic actuator powered by hydraulic system 2
How are the nose gear forward and aft doors normally actuated?
- Forward doors are operated by a hydraulic actuator
- Aft door is attached to the gear
How are the gear doors opened for gear bay inspection on the ground?
With the LG PULL handle in the flight compartment
How are the gear doors closed after the gear bays have been inspected on the ground?
- 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
When is the “Too Low Gear” warning sounded?
- 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
When is the gear aural warning mutable?
- 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
What happens when the LG manual release handle is pulled?
- 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
After a manual landing gear extension, which caution CAS messages are displayed?
L MAIN GEAR DOOR
R MAIN GEAR DOOR
NOSE GEAR DOOR
How will the NWS operate after manual gear extension?
Free-caster mode
Note: this assumes you have followed the checklist and placed the NWS switch in OFF.
How is the NWS system controlled and actuated?
- Electrically controlled
- Hydraulically actuated (HYD system 2)
What are the NWS limits for the Tiller and Rudder?
Tiller ± 82.5°
Rudder ± 9°
What is recommended to be done to the nose gear before towing operations?
- Disconnect the nosewheel steering torque links
- Disconnect and stow the tire pressure lead
How are the brake wear indicator pins normally checked?
- Parking brake set or
- Pedal brake application applied with Hydraulic systems 2 and 3 pressurized
Which brakes operate from the PARK/EMER handle?
All four brakes
Which hydraulic system operates the brakes when using the PARK/EMER handle?
Systems 2 and 3
Which hydraulic systems operate the normal brake system?
Hydraulic system 2 (outboard brakes)
Hydraulic system 3 (inboard brakes)
How is the PARK/EMER brake actuated?
Mechanical linkages to the parking brake valve
Note: this system is completely mechanical. It will operate in flight.
If selected on, under what conditions will the autobrake disarm?
- 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
When will the autobrake RTO function be applied?
- The autobrake rotary switch is enabled in RTO
- Speed above 60kt
- Engine thrust levers are at idle or
- Thrust reversers are applied
