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April 1, 1990 · Aerospatiale AS350B · N350AP
Saipan, PO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
April 1, 1990
Injury Outcomes
No injuries (2 uninjured)
Location
Saipan, PO
Aircraft
Aerospatiale AS350B
Tail Number
N350AP
Operator
Micronesian Aviation
Injuries
None
Aircraft Damage
Destroyed
NTSB Number
LAX90LA132
THE PILOT AND PAX WERE CRUISING OVER THE PHILIPPINE SEA WHEN THE PILOT FELT AN EXTREME VIBRATION. THE PILOT MADE AN EMERGENCY LANDING IN THE 7-FT SEA. THE PILOT REPORTED THAT PRIOR TO THE HELICOPTER OVERTURNING HE OBSERVED THAT 'ONE OF THE ELASTOMERIC SPHERICAL THRUST BEARINGS WAS COMPLETELY GONE.' THE HELICOPTER SUBSEQUENTLY OVERTURNED, SANK AND HAS NOT BEEN RECOVERED. THE ACFT'S ROTOR SYSTEM HAD PREVIOUSLY BEEN INVOLVED IN A SUDDEN STOPPAGE MISHAP AND HAD THEREAFTER BEEN REPAIRED AND RETURNED TO SERVICE BY OTHER THAN THE CURRENT COMPANY MAINTENANCE PERSONNEL.
NTSB Probable Cause
THE PARTIAL FAILURE OF A ROTOR SYSTEM COMPONENT FOR UNDETERMINED REASONS.
Full Narrative
THE PILOT AND PAX WERE CRUISING OVER THE PHILIPPINE SEA WHEN THE PILOT FELT AN EXTREME VIBRATION. THE PILOT MADE AN EMERGENCY LANDING IN THE 7-FT SEA. THE PILOT REPORTED THAT PRIOR TO THE HELICOPTER OVERTURNING HE OBSERVED THAT 'ONE OF THE ELASTOMERIC SPHERICAL THRUST BEARINGS WAS COMPLETELY GONE.' THE HELICOPTER SUBSEQUENTLY OVERTURNED, SANK AND HAS NOT BEEN RECOVERED. THE ACFT'S ROTOR SYSTEM HAD PREVIOUSLY BEEN INVOLVED IN A SUDDEN STOPPAGE MISHAP AND HAD THEREAFTER BEEN REPAIRED AND RETURNED TO SERVICE BY OTHER THAN THE CURRENT COMPANY MAINTENANCE PERSONNEL.
Flight
Event TypeAccident
Event Time13:55
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAerospatiale AS350B
Tail NumberN350AP
Aircraft CategoryHeli
DamageDestroyed
OperatorMicronesian Aviation
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsTurbomeca · ARRIEL · Turboshaft · 641
Seats7
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 28 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind20° @ 10 kt, gusting 12 kt
Visibility35 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO