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 sensors mounted on each gear.
How is Normal Extension and Retraction of the Landing Gear controlled?
Electrically controlled by the LGSCU (Landing Gear & Steering Control Unit).
What should the Brake Accumulators pre-charge pressure be when the Hydraulic System is Depressurized?
650psi +/- 100psi.
Which Hydraulic Systems operate the Landing Gear?
- Hydraulic System 2: Nose Landing Gear + NWS.
- Hydraulic System 3: Main Landing Gear Extension & Retraction.
How is excessive Air Pressure due to Heat built-up in the main wheel/tire assembly released?
4 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 MLG doors and NLG doors operated?
- MLG Outboard doors and NLG aft door are attached to the gear;
- MLG Inboard doors and NLG Forward are operated by Hydraulic System 2.
How are the Gear Doors opened for Gear Bay inspection on the ground?
- Pull the LG Manual Release Handle in the flight compartment;
- Note: Pins & collars are available to secure the doors.
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;
- Hydraulic System 2 pressure is applied;
- The Main Gear Inboard doors will close immediately;
- The Nose Gear Forward doors are closed with a pushbutton on the Forward External Service Panel.
What is the Maximum operating Altitude with Landing Gear Extended?
20,000 ft.
What is the Maximum Speed for Landing Gear Operation and Extended?
- VLO = 200 Kt.
- VLE = 250 Kt.
When is the “TOO LOW, GEAR” aural Warning sound?
- Any Landing Gear is Not down and locked, and
- Radio Altimeters are Less than 500 ft AGL, and
- Speed Less than 190 Kt.
When is the Gear aural mutable?
- Any Gear is Not down and locked, and
- Aircraft Altitude below 16,500 ft, and
- Radio Altimeters below 600ft or invalid, and
- Both TLA (Thrust Lever Angle) are below 25° set to Approach, and
- Aircraft speed below 190 kts.
What happens when the LG Manual Release Handle is pulled?
- Shutoff and Dump Valves are mechanically actuated;
- Uplocks for all MLG and NG and their doors are Released;
- Alternate Power Valve is mechanically actuated to pressurize the down side of the MLG Retraction
Actuators to assist free fall.
- Alternate Power Valve is mechanically actuated to pressurize the down side of the MLG Retraction
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.
How is the NWS System normally controlled and actuated?
- Electrically controlled by the LGSCU;
- Hydraulically actuated by Hydraulic System 2.
What are the NWS Limits for the Tiller and Rudder?
- Tiller: +/- 82.5°
- Rudder: +/- 9°
What is the recommended procedure regarding the Nose Gear before Towing Operations?
- FCOM1 / Chapter 11 / Airplane Servicing / 07.Towing, 01.General.
- Disconnect the Nosewheel Steering Torque Links;
- Ensure minimum of 5,000 lbs is loaded in the tanks or the load on the Nose Gear is not less than 1,900 lbs;
- The CG envelope is within limits.
How are the brake wear indicator pins normally checked?
Parking brake or Pedal brake applied with Hydraulic System 2 & 3 pressurized.
Which Brakes are operated from the PARK/EMER Handle?
All 4 Brakes.
Which Hydraulic Systems operates the Brakes when using the PARK/EMER Handle?
Hydraulic Systems 2 & 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.
If Autobrake is selected ON, under what conditions will it Disarm?
- AUTOBRAKE Rotary switch selected 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.
Describe the Autobrake Deceleration rate.
- Low: 4ft/sec²;
- Med: 8ft/sec²;
- High: 13ft/sec²;
- RTO: 15ft/sec²
Describe the Brake Monitoring System relation Color/Range/Action
- Green : 00 – 08 = No Action Required;
- White : 09 – 23 = See AFM (typically wait 35 min).
- Red : 24 and Above = No Takeoff (maintenance action required).
- Magenta: - - Invalid Data.
Note: Each unit is equal to an increase of 25°C (starting with 00 = -25°C).
Whenever the brake is applied heavily (i.e. RTO), wait at least 15 min for the brake temp to peak,
Then go to the AFM 06-06-5 (Maximum Permissible Quick Turn-around Table).
When will the Autobrake RTO function be applied?
- The Autobrake Rotary Switch is selected in RTO;
- RTO will be active when Speed > 60 Kt during takeoff;
- Engine Thrust Levers are at idle or Thrust Reversers are applied.
