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NTSB Report
December 31, 1992 · Rockwell 690B · N300CP
Herlong, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
December 31, 1992
Injury Outcomes
2 injuries (2 fatalities)
Location
Herlong, CA
Aircraft
Rockwell 690B
Tail Number
N300CP
Operator
Medic Air
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
LAX93FA086
THE PILOT AND FLIGHT NURSE WERE EN ROUTE TO PICK UP A MEDICAL PATIENT. THE AIRPLANE EXPERIENCED AN IN-FLIGHT BREAKUP WHILE FLYING BY THE LEEWARD SIDE OF THE SIERRA NEVADA MOUNTAINS IN THE GENERAL AREA WHERE STANDING LENTICULAR CLOUDS HAD BEEN OBSERVED. NO EVIDENCE WAS FOUND THAT THE PILOT OBTAINED A WEATHER BRIEFING FROM FLIGHT SERVICE OR THE DUAT VENDORS PRIOR TO DEPARTURE. PILOTS FLYING IN THE GENERAL AREA HAD REPORTED AIRSPEED VARIANCES FROM PLUS 60 TO MINUS 40 KTS. AN IN-FLIGHT WEATHER ADVISORY FOR OCCASIONAL MODERATE TURBULENCE WAS IN EFFECT. ABOUT ONE HOUR AFTER THE ACCIDENT THE WEATHER SERVICE ISSUED A SIGMET FOR SEVERE TURBULENCE.
NTSB Probable Cause
AN INADVERTENT ENCOUNTER WITH SEVERE TURBULENCE WHICH EXCEEDED THE DESIGN STRENGTH OF THE AIRPLANE'S STRUCTURE.
Full Narrative
THE PILOT AND FLIGHT NURSE WERE EN ROUTE TO PICK UP A MEDICAL PATIENT. THE AIRPLANE EXPERIENCED AN IN-FLIGHT BREAKUP WHILE FLYING BY THE LEEWARD SIDE OF THE SIERRA NEVADA MOUNTAINS IN THE GENERAL AREA WHERE STANDING LENTICULAR CLOUDS HAD BEEN OBSERVED. NO EVIDENCE WAS FOUND THAT THE PILOT OBTAINED A WEATHER BRIEFING FROM FLIGHT SERVICE OR THE DUAT VENDORS PRIOR TO DEPARTURE. PILOTS FLYING IN THE GENERAL AREA HAD REPORTED AIRSPEED VARIANCES FROM PLUS 60 TO MINUS 40 KTS. AN IN-FLIGHT WEATHER ADVISORY FOR OCCASIONAL MODERATE TURBULENCE WAS IN EFFECT. ABOUT ONE HOUR AFTER THE ACCIDENT THE WEATHER SERVICE ISSUED A SIGMET FOR SEVERE TURBULENCE.
Flight
Event TypeAccident
Event Time15:36 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRockwell 690B
Tail NumberN300CP
Aircraft CategoryAir
DamageDestroyed
OperatorMedic Air
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · 331-5-251K · Turboprop · 717
Seats3
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 51 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourceWIT