main menu

Pages

 airframe Vibration in the Forward Fuselage area


How an airframe Vibration in the Forward Fuselage area can be isolated to the nose landing gear wheels? What preventive maintenance actions help?

  • Fuselage Vibration can have multiple contributing factors, Nose wheel & tire assemblies are among the most prominent.
  •  How to isolate, if the vibration is due to MLG or NLG during take-off run or just after Lift-off?
 Simple Observation :
  • If, after the Liftoff, Vibration stops immediately after the landing gear selection lever is selected Up or Brakes applied, Vibration the source is the Main landing gear.
  • If, after the Liftoff, the Vibration diminishes gradually, vibration is due to the Nose wheels.

 What causes the Nose wheels to initiate a Vibration?
  •  Nose wheel static balancing - Proper balancing of Nose wheels at workshop level is key to solve many vibration issues.
  •  Nose wheel Bearings - Premature wear of Nose wheel bearings also contribute most of the vibration cases linked to NLG.
  •  Factors behind the worn-out Nose wheel bearings are "Improper Installation", "Operating conditions", "Bearing environment" & "Improper Lubrication".
  •  Bearing deterioration can be avoided by proper Cleaning, inspection, torquing & Pre-load Rotation of wheels (Roller seating).


reactions :

Comments