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Aviation experts say a LOT Polish Airlines flight from Newark, N.J., made an emergency landing in Warsaw last year because of technical problems with the Boeing 767 and inadequate guidance in its cockpit handbook.
None of the 231 people aboard were injured when the plane landed on its belly on Nov. 1, 2011, after its landing gear failed.
In its preliminary opinion Wednesday, Poland's State Commission for Investigation of Air Accidents said the aircraft's main landing gear discharge system failed due to a broken hydraulic hose, and the backup system failed because its circuit breaker was in the off position, probably accidentally.
The commission said the cockpit checklist did not include guidance on a malfunction of the alternate landing gear system, and that Boeing should correct that problem.