BBD-700 Landing Gear and Brakes Flashcards
What type of brakes are used on the Global Express?
Carbon Disc brakes
How are the main wheel brakes controlled and actuated?
Electrically controlled via brake by wire system
Hydraulically actuated
How is weight on wheels (WOW) sensing accomplished?
Via two proximity sensors on each gear assembly
How is normal extension and retraction of the landing gear controlled?
Electrically controlled by the landing gear electronic control unit (LGECU)
Which hydraulic systems operate the landing gear?
Hydraulic systems 2 and 3
How are the main gear inboard doors operated?
Hydraulically by system 3
How is excessive air pressure due to heat buildup in the main wheel/tire assembly released?
Four heat sensitive fuseplugs
How is main landing gear overheat detected in the gear bays?
Single-loop heat sensing elements
How are the nose gear and forward doors normally actuated?
Hydraulically by system 3
When is the “Too Low Gear” warning sounded?
Any landing gear is not down and locked, and
Radio altimeter less than 500 feet AGL
What is the maximum operating speed for extending / retracting the landing gear?
200 KIAS
What is maximum airspeed with the landing gear extended
250 KIAS / .7 M
What is the maximum operating altitude with the landing gear extended?
20,000 feet
After “manual” landing gear extension, which gear doors caution messages are displayed?
L-R MAIN GEAR DOOR
NOSE DOOR
What will be the NWS operation mode after “manual” gear extension.
Free caster mode
How is the NWS system controlled and actuated?
Electrically controlled Hydraulically actuated (system 3)
What are the NWS limits for the Tiller and Rudder?
Tiller +/- 75 degrees
Rudder +/- 7.5 degrees
Note: NWS inputs are summed
What is recommended for all towing operations?
Disconnect the NWS torque link
How are the brake wear indictor pins normally checked?
Parking brake applied
Hydraulic system 3 pressurized
Which hydraulic systems operate the brake system?
Hydraulic system 2 (outboard brakes)
Hydraulic system 3 (inboard brakes)
How is the PARK/EMER BRAKE actuated?
Mechanical linkages transfer manual inputs to the parking brake valve
Under what conditions will the autobrake apply?
Autobrake either LOW, MED, or HI
Both MLG indicate weight off weels (AIR)
Ground spoilers are commanded to deploy
How is the BRAKE OVHT warning message cancelled?
By momentarily pressing the BTMS OVHT WARNING RESET
Note: Provided the overheat condition no longer exists
