NTSB Identification: LAX90IA293.
The docket is stored on NTSB microfiche number 45477.
Scheduled 14 CFR operation of UNITED AIRLINES
Incident occurred Tuesday, August 21, 1990 in LOS ANGELES, CA
Probable Cause Approval Date: 12/30/1992
Aircraft: BOEING 737-322, registration: N305UA
Injuries: Unavailable

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE FLIGHT OF UAL FLIGHT 1257 WAS UNEVENTFUL UNTIL THE CREW EXTENDED THE LANDING GEAR FOR LANDING AT THE DESTINATION AND RECEIVED AN UNSAFE RIGHT MAIN LANDING GEAR INDICATION. THE CREW WAS UNABLE TO EXTEND THE GEAR AND PRECEDED TO AN AIRPORT WITH A LONGER RUNWAY FOR A GEAR UP LANDING. THE LANDING WAS ACCOMPLISHED WITHOUT INJURIES. THE RIGHT POWERPLANT NACELLE RECEIVED INCIDENTAL DAMAGE DURING THE LANDING TOUCHDOWN. WHEN THE RIGHT LANDING GEAR WAS OPENED A 3 CELL FLASHLIGHT WAS FOUND SANDWICHED BETWEEN THE CARGO FLOORING AND THE LANDING GEAR RETRACT/EXTEND LINKAGE.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

IMPROPER MAINTENANCE SERVICE BY A COMPANY EMPLOYEE WHO ALLOWED A FOREIGN OBJECT (FLASHLIGHT) TO REMAIN IN THE LANDING GEAR EXTEND/RETRACT LINKAGE DURING A NIGHT SERVICING BEFORE THE FLIGHT.

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