Incident · 1999-10-28

NTSB case CHI00IA018 · Boeing 757-222 · Part 121

What the record says

Event date: 1999-10-28
Event type: Incident
Highest injury level: No injuries
Aircraft: Boeing 757-222 (N575UA)
Operating rule: Part 121
Operator: operator not named in the NTSB record

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.

Source: NTSB case CHI00IA018

Flight crew

Flight-crew details for this event aren't in the NTSB database extract we hold (its coverage starts with 2008 events) — a gap in our data, not an absence of crew.

Facts as the NTSB records them — GroundCheck adds no judgement. Preliminary records may be revised as the investigation proceeds.

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