Landing Gear & Brakes Flashcards
What hydraulic system powers the landing gear and nose wheel steering?
System number 3
What hydraulic systems power the wheel brakes?
Systems 2 (Outboard Brakes) and 3 (Inboard Brakes)
How is the main landing gear (MLG) held in the up position?
Mechanical Uplocks
How is the nose landing gear (NLG) held in the up position?
An Over Center Uplock
What is the function of the nose gear lock actuator assembly?
It is a dual acting lock and is used to unlock the over-center lock for both the up and down positions
What is the function of the nose gear brake pads?
To stop tire rotation after gear retraction
How can the landing gear be lowered if the normal extension system fails?
By using the Manual Landing Gear Release Handle
What is the function of the Downlock Release Button on the Landing Gear Panel?
It withdraws the solenoid lock permitting an UP selection of the landing gear lever.
What is the function of the tail skid installed on the tail cone of the aircraft?
It is designed to absorb the force of an impact if the rear fuselage contacts the ground.
What occurs upon operation of the Manual Landing Gear Release Handle?
The two MLG uplocks are mechanically released and NLG over center lock is hydraulically released.
What is the function of the MLG Overheat Detection System?
To monitor the wheel bins for an overheat condition
When is the nose wheel steering operational?
- Hydraulic system number 3 is pressurized
- The NLG is down and locked
- A weight on wheels signal is present
What is the maximum nose wheel deflection via the rudder pedals?
8 degrees left or right of the center position.
What is the maximum nose wheel deflection via the steering tiller?
80 degrees left or right of the center position.
What is the maximum nose wheel deflection when towing the aircraft with the steering torque arms connected?
80 degrees left or right of the center position.
What is the maximum nose wheel deflection when towing the aircraft with the steering torque arms disconnected?
Full 360 degree movement
What is the function of a tire chine?
To deflect ground water and other contaminates and prevent them from entering the engine inlets.
What is the maximum tire speed for the CRJ-700?
182 Knots
How is main wheel rotation stopped during gear retraction?
Hydraulic pressure from the nose gear up line is directed to the brake control valves to stop main wheel rotation.
How many brake applications are available in case of failure of hydraulic systems two and three?
Six
How can the crew visually verify brake wear limits?
By checking the Brake Wear Indicators at each MLG wheel assembly.
What is the function of the Anti-Skid System?
It prevents wheel lock-up during braking.
Is Anti-Skid System protection available with the use of the Parking/Emergency Brake handle?
No
When is the Anti-Skid System armed?
- Anti-Skid System switch in the ON position
- Parking Brake OFF
- One main gear down & locked
When is the Anti-Skid System operational after landing?
Wheel speed greater than 35 knots or weight-on-wheels for 5 seconds.
When is the Anti-Skid System automatically disabled?
Less than 10 knots wheel speed or Parking Brake ON
What is the function of the Brake Temperature Monitoring System (BTMS)?
It continuously monitors the temperature of each brake by means of a thermocouple and displays that temperature as a color coded numerical readout on the Status Page.
What will occur to the brake temperature indication, after a brake overheat, once the brakes have returned to normal temperature values?
The numerical readout and box will remain red even after the brakes have cooled. Pressing the reset button will reset the color presentation to agree with the numerical value.
What is the function of the wheel fusible plugs?
If the temperature of the wheel and tire exceed a preset value, the fusible plug melts allowing the tire to deflate.
When will the brake temperatures and landing gear indications be displayed on the EICAS?
- On approach with the selection of Flaps 1or Landing Gear DOWN
- Any time there is a presentation of a red BTMS indication
When are the brake temperatures and landing gear indications automatically removed from the EICAS?
- The Landing Gear is up and locked
- The Flaps are up
- The BTMS indications are normal