Service difficulty report · Bearing · Boeing 757222

Difficulty date
April 7, 2007
Submitted
April 17, 2007
Operation
Air carrier
Aircraft
N584UA
Make and model
Boeing 757222
Aircraft serial
26706
Aircraft time
46,504 hours, 16,057 cycles
Engine
Pwa PW2037
Engine time
46,220 hours, 16,368 cycles
Part
Bearing
Condition
Failed
Location
Gearbox
Stage of operation
AP
How discovered
O
Nature of condition
J
Precautionary procedure
E

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FLIGHT LANDED UNDER AMBER ALERT DUE TO ENGINE SHUT-DOWN ON FINAL. [SUP 05-24-07] THIS OCCURRENCE WAS DUE TO ANGLE GEARBOX BEARING FAILURE CAUSED BY EXCESSIVE VIBRATORY STRESS. THIS IS BELIEVED TO HAVE BEEN THE RESULT OF AN IMPROPER BALANCING OF THE LOWER TOWER SHAFT WHICH COULD HAVE OCCURRED DURING INITIAL STAGE OF MANUFACTURE AT THE OEM.