Incident · 1990-08-27

NTSB case LAX90IA305 · BOEING 747-422 · Part 121

What the record says

Event date: 1990-08-27
Event type: Incident
Highest injury level: Minor injury
Aircraft: BOEING 747-422 (N174UA)
Operating rule: Part 121
Operator: UNITED AIRLINES, INC. Operator named in NTSB report
Operated by (per NTSB report): UNITED AIRLINES

Probable cause

THE FAILURE OF THE MANUFACTURER TO ENSURE THAT THE LANDING GEAR SELECTOR VALVES AND THEIR ASSOCIATED DRUM LINK ASSEMBLIES WERE PROPERLY INSTALLED PRIOR TO DELIVERY OF THE AIRCRAFT. A FACTOR IN THE ACCIDENT WAS THE LACK OF INFORMATION AVAILABLE TO THE CREW CONCERNING THE SECONDARY ALTERNATE GEAR EXTENSION PROCDURE.

Source: NTSB case LAX90IA305

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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