Incident · 2019-02-21

NTSB case ENG19IA013 · Boeing 737 · Part 121

What the record says

Event date: 2019-02-21
Event type: Incident
Highest injury level: No injuries
Aircraft: Boeing 737 (N30401)
Operating rule: Part 121
Operator: UNITED AIRLINES, INC. Operator named in NTSB report
Operated by (per NTSB report): UNITED AIR LINES INC

Probable cause

A No. 1 (left) engine high pressure compressor stage 2 blade separation. The blade separated due to a mixed-mode fatigue crack that originated on a blade disk post and was initiated by a misaligned (out-of-schedule) high pressure compressor stage 1 variable stator vane that was missing a washer and retaining nut on the vane trunnion stem.

Source: NTSB case ENG19IA013

Flight crew

No flight-crew details recorded in the NTSB accident database for this event.

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

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