Narrative:

Nothing unusual was noted during the pre-flight walk-around. During taxi-out; all was normal. No nose shaking or shimmy was present. Takeoff roll was normal to about 60 KTS. Nosewheel shaking was noted and was initially thought to be that the airplane was tracking on the center line light assemblies. As speed increased; the PIC moved the plane off the centerline lights; but the shaking continued. After rotation; the shaking continued as the nosewheel retracted. As the nosewheel [brake] snubbers slowed the wheels to a stop; the shaking reduced proportionally to nothing. Enroute; considerable discussion was had as to the situation and the possible cause. Two hours from [our destination]; an emergency was declared; and appropriate information was passed to ATC. At [our destination] the winds were variable to calm. The longest runway was chosen [and] 30-degrees flaps was chosen. The approach was normal and on-speed. Touchdown was gentle and the nosewheel was lowered extremely slowly. The nosewheel shaking started at nosewheel touchdown; with the same rhythm as related to speed and intensity as during takeoff. The plane was brought to a complete stop on the runway. The nosewheel was examined by a mechanic; and tow to the gate was initiated. At the gate; the flight crew inspected the nosewheel assembly and discovered on the right wheel; inside rim; about 60 to 90-degrees of the [wheel] rim had broken away; and gone. The tire was still inflated; but seriously out of round.

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Original NASA ASRS Text

Title: A First Officer and Captain report that one third of a nosewheel rim had broken away on the inboard side of the right nose tire on a B757-200 aircraft during takeoff; causing wheel shaking and vibrations. Aircraft landed in emergency conditions at destination. Tire was still inflated; but severely out of round. Captain noted that Mechanic had lied about condition of tire and moved aircraft without discussing with Captain; Dispatch or Maintenance Control.

Narrative: Nothing unusual was noted during the pre-flight walk-around. During taxi-out; all was normal. No nose shaking or shimmy was present. Takeoff roll was normal to about 60 KTS. Nosewheel shaking was noted and was initially thought to be that the airplane was tracking on the center line light assemblies. As speed increased; the PIC moved the plane off the centerline lights; but the shaking continued. After rotation; the shaking continued as the nosewheel retracted. As the nosewheel [brake] snubbers slowed the wheels to a stop; the shaking reduced proportionally to nothing. Enroute; considerable discussion was had as to the situation and the possible cause. Two hours from [our destination]; an emergency was declared; and appropriate information was passed to ATC. At [our destination] the winds were variable to calm. The longest runway was chosen [and] 30-degrees flaps was chosen. The Approach was normal and on-speed. Touchdown was gentle and the nosewheel was lowered extremely slowly. The nosewheel shaking started at nosewheel touchdown; with the same rhythm as related to speed and intensity as during takeoff. The plane was brought to a complete stop on the runway. The nosewheel was examined by a Mechanic; and tow to the gate was initiated. At the gate; the flight crew inspected the nosewheel assembly and discovered on the right wheel; inside rim; about 60 to 90-degrees of the [wheel] rim had broken away; and gone. The tire was still inflated; but seriously out of round.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.