Incident · 1989-10-09

NTSB case CHI90IA006 · BOEING 757-251 · Part 121

What the record says

Event date: 1989-10-09
Event type: Incident
Highest injury level: No injuries
Aircraft: BOEING 757-251 (N512US)
Operating rule: Part 121
Operator: NORTHWEST AIRLINES INC Operator named in NTSB report
Operated by (per NTSB report): NORTHWEST AIRLINES

Probable cause

THE EXTREME WEAR AND EVENTUAL FAILURE OF A TORQUE TUBE IN THE INBOARD TRAILING EDGE FLAP SYSTEM. INSPECTION AND LUBRICATION INTERVALS WERE A FACTOR, AS WAS THE PHYSICAL LOCATION OF THE TORQUE TUBE WITH REFERENCE TO EXTERNAL FACTORS.

Source: NTSB case CHI90IA006

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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