N751PA
BOEING 747-121
WHILE CLIMBING THROUGH FL200 CREW EXPERIENCED A LOSS OF #4 HYDRAULIC SYSTEM PRESSURE, ILLUMINATION OF THE RED 'GEAR DOOR' AND 'LEFT WING DOOR OPEN' LIGHTS, A MEDIUM FREQ VIBRATION AND HEARD A LOUD RUSHING SOUND. FLT DIVERTED TO MIAMI, FL, WHERE LANDING WAS MADE WITHOUT INCIDENT. INVESTIGATION DISCLOSED LEFT WING LANDING GEAR DOOR ACTUATOR, ACTUATOR BEAM ASS'Y AND ASSOC KEEL BEAM BOX ATTACHING HARDWARE WERE MISSING. BOEING SUBSEQUENTLY HAS ISSUED A SERVICE BULLETIN REGARDING DETECTION OF CRACKS IN THE INTERNAL BACK-UP BRACKETS & FITTINGS FOR THE WING GEAR DOOR ACTUATING SYSTEM.
Source: NTSB Aviation Accident Database
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