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NTSB Report
April 14, 1984 · Boeing 747-121 · N751PA
MB
Overview
Report Status
Preliminary report
Event Type
Incident
Date
April 14, 1984
Injury Outcomes
No injuries (263 uninjured)
Location
MB
Aircraft
Boeing 747-121
Tail Number
N751PA
Operator
Pan American Paaa
Injuries
None
Aircraft Damage
Minor
NTSB Number
MIA84IA140
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time23:50 UTC
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 747-121
Tail NumberN751PA
Aircraft CategoryAir
DamageMinor
OperatorPan American Paaa
Operating RulePart 121
Engines4
Engine TypeTurbofan
Engine DetailsP&W · JT9D · Turbofan
Seats495
People & Injuries
Injury SummaryNo injuries (263 uninjured)
Fatal0
Serious0
Minor0
Uninjured263
Total263
Crew 1Age 50 · Unknown
Conditions
ConditionsVMC
LightNr
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0