NTSB Identification: MIA84IA140.
The docket is stored on NTSB microfiche number 26005.
Scheduled 14 CFR operation of PAN AMERICAN (PAAA)
Incident occurred Saturday, April 14, 1984 in
Aircraft: BOEING 747-121, registration: N751PA
Injuries: 263 Uninjured.

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

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.

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

DOOR,LANDING GEAR..FATIGUE

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