NONE · Boeing 757-222 · 1999-10-29 · CHICAGO, IL, USA
Event
NTSB number
CHI00IA018
Event ID
20001212X19914
Type
Incident
Date
1999-10-29
Location
CHICAGO, IL, USA
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
68
Total aboard
68
Aircraft
Make
Boeing
Model
757-222
Registration
N575UA
FAR Part
121
Engines
2
Damage
—
Conditions
Light
NITE
Weather
VMC
Probable cause
the in-flight vibration of the airplane's elevator due to excessive freeplay in the elevator control system. Factors included the corrosion of the elevator PCA reaction link bearings and the elevator hinge bearings, excessive axial and radial wear of the elevator PCA reaction link bearings, the inadequate procedures for lubricating the elevator hinge bearings, and the incorrect procedures for measuring elevator free play.