Landing gear normal operation

Landing gear retraction

• • The top LANDING GEAR indicator lights are illuminated red when one or more of the gear is in disagreement with the lever position. This is normal when the gear are in transit, but may also indicate an unsafe condition.
  • Main gear가 retract될 때, Wheel brake가 작동되어 Wheel spin을 stop시켜 준다.
  • HYD SYS A가 landing gear를 retract 시킨다.
  • Landing gear가 Up and Lock되면, RED light 가 OFF된다. (The RED lights are extinguished once the gear is up and locked and the LANDING GEAR lever is UP or OFF. They are also extinguished when the gear is down and locked and the LANDING GEAR lever is DN)Gear transit 중에는 Green light는 OFF되고, Red light는 ON된다.
  • Mechanical Uplock이 Main gear를 Up position에, Over-center Lock link가 Nose gear를 Up position에 유지해준다.
    • Landing gear Up Lock후에도 HYD SYS A는 return되지 않는다.
  • Landing gear lever를 OFF에 두면, HYD SYS A pressure는 return된다.
  • The lights will also illuminate when the aircraft is below 800 ft AGL with the gear not down and locked and one or both thrust levers are retarded to IDLE.

 

 

Landing gear extension

• Landing gear lever를 DOWN에 두면, SYSTEM은 Up lock을 release하고, gear는 extend되기 시작한다.
• gear가 lock되기 전까지는 red light가 on되어 있다.
• gear가 완전히 down lock되면 red light는 off되고 green gear indicator가 on된다.

 

Nose wheel steering 

• Nose wheel steering은 rudder pedal과 nose steering wheel에 의해 control 된다.
• Rudder pedal은 최대 +/-7도 turn되며 taxi, take off, landing시 사용된다.
• Nose steering wheel 은 최대 78도 turn가능하다.
  • Nose steering wheel은 2 control을 동시에 움직이면 steering을 Control 한다
  • Primary steering control is through the nose wheel steering wheel. When rotated, it turns the nose wheel up to 78° in either direction and will override and rudder pedal steering inputs.
• Nose wheel steering은 HYD SYS A에 의해 작동한다.