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NTSB Report
February 10, 2015 · Raytheon Aircraft B300 Undesignat · N49WC
Mammoth Lakes, CA
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
February 10, 2015
Injury Outcomes
No injuries (2 uninjured)
Location
Mammoth Lakes, CA
Aircraft
Raytheon Aircraft B300 Undesignat (1996)
Tail Number
N49WC
Operator
West Coast Charters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
WPR15CA110
The pilot reported that while in a descent from 16,000 feet, at 1,500 feet per minute, slowing from 190 knots indicated airspeed to 160 knots, the airplane encountered extreme turbulence. The pilot reported one hard jolt up/down followed by about 15 seconds of light turbulence then one final hard jolt similar to the first. The weather was visual conditions and no turbulence was encountered prior to or after the event. A postflight examination of the airplane revealed that the extreme turbulence encountered resulted in substantial structural damage to both wings spars. The pilot reported there were no pre-impact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.
NTSB Probable Cause
Environmental issues-Conditions/weather/phenomena-Turbulence-(general)-Effect on equipment - C
Full Narrative
The pilot reported that while in a descent from 16,000 feet, at 1,500 feet per minute, slowing from 190 knots indicated airspeed to 160 knots, the airplane encountered extreme turbulence. The pilot reported one hard jolt up/down followed by about 15 seconds of light turbulence then one final hard jolt similar to the first. The weather was visual conditions and no turbulence was encountered prior to or after the event. A postflight examination of the airplane revealed that the extreme turbulence encountered resulted in substantial structural damage to both wings spars. The pilot reported there were no pre-impact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.
Flight
Event TypeAccident
Event Time17:00 PST
Nearest AirportMammoth Yosemite (55nm SE)
Runway27
Runway Length7000 ft
Runway Width100 ft
Flight Plan FiledIFR
Flight Plan ActivatedYes
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRaytheon Aircraft B300 Undesignat
Tail NumberN49WC
Aircraft CategoryAir
DamageSubstantial
OperatorWest Coast Charters
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsPratt & Whitney · PT6A-60A · Turboprop · 1050 | Pratt & Whitney · PT6A-60A · Turboprop · 1050
Seats11
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 36 · First Class · None
Crew 2Age 28 · First Class · None
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point64 F / 12 C
Altimeter30.02 inHg
Observation Time00:56
Weather SourceWFAC