Incident · 1991-04-29

NTSB case NYC91IA133 · BOEING 747SP · Part 121

What the record says

Event date: 1991-04-29
Event type: Incident
Highest injury level: No injuries
Aircraft: BOEING 747SP (N148UA)
Operating rule: Part 121
Operator: UNITED AIRLINES, INC. Operator named in NTSB report
Operated by (per NTSB report): UNITED AIRLINES

Probable cause

A FAILURE OF THE SIXTH ROTATING AIRSEAL WHICH LED TO AN UNCONTAINED ENGINE FAILURE.

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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