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NTSB Report
February 15, 1990 · Boeing 747-446B · UNREG
Everett, WA
Overview
Report Status
Probable Cause
Event Type
Incident
Date
February 15, 1990
Injury Outcomes
No injuries (7 uninjured)
Location
Everett, WA
Aircraft
Boeing 747-446B
Tail Number
UNREG
Injuries
None
Aircraft Damage
Minor
NTSB Number
SEA90IA042
DURING THE LANDING ROLL, AT THE END OF A FLIGHT, THE PILOT REPORTED THAT THE EICAS DISPLAYED A CAUTION MESSAGE OF HYDRAULIC PRESSURE AND QUANTITY AND GEAR DOOR. THE PILOT ALSO NOTED THAT THE AIRPLANE WAS LISTING TO THE RIGHT. IT WAS LATER FOUND THAT THE RIGHT WING LANDING GEAR, OUTER CYLINDER AFT TRUNNION ARM BROKE. THE PART WAS METALLURGICALLY TESTED AND FOUND THAT THE TRUNNION FRACTURED AS A RESULT OF PRE-EXISTING INTERGRANULAR CRACKS.
NTSB Probable Cause
A BREAK FROM PRE-EXISTING INTERGRANULAR CRACKS WHICH LED TO A FRACTURE.
Full Narrative
DURING THE LANDING ROLL, AT THE END OF A FLIGHT, THE PILOT REPORTED THAT THE EICAS DISPLAYED A CAUTION MESSAGE OF HYDRAULIC PRESSURE AND QUANTITY AND GEAR DOOR. THE PILOT ALSO NOTED THAT THE AIRPLANE WAS LISTING TO THE RIGHT. IT WAS LATER FOUND THAT THE RIGHT WING LANDING GEAR, OUTER CYLINDER AFT TRUNNION ARM BROKE. THE PART WAS METALLURGICALLY TESTED AND FOUND THAT THE TRUNNION FRACTURED AS A RESULT OF PRE-EXISTING INTERGRANULAR CRACKS.
Flight
Event TypeIncident
Event Time17:50 PST
Nearest AirportPAINEFLD (0nm N)
Runway16R
Runway Length9010 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 747-446B
Tail NumberUNREG
Aircraft CategoryAir
DamageMinor
Operating RulePart 91
Engines4
Engine TypeTurbofan
Engine DetailsGe · CF6-80C2B1F · Turbofan
People & Injuries
Injury SummaryNo injuries (7 uninjured)
Fatal0
Serious0
Minor0
Uninjured7
Total7
Crew 1Age 54 · First Class
Conditions
ConditionsVMC
LightDark Night
Wind120° @ 12 kt
Visibility25 sm
CeilingBroken clouds 6000 ft
Temperature / Dew Point30 C / 19 C
Altimeter30.00 inHg
Weather SourcePILO