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NTSB Report
April 23, 1987 · Schweizer SGS2-33 · N11468
Mokuleia, HI
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 23, 1987
Injury Outcomes
3 injuries (1 serious injury, 2 minor injuries)
Location
Mokuleia, HI
Aircraft
Schweizer SGS2-33
Tail Number
N11468
Operator
Honolulu Soaring Club
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
LAX87DJA06
DURING A LOCAL SIGHTSEEING FLT ALONG A RIDGE LINE, WHILE MANEUVERING AROUND A CLOUD BUILD-UP, THE ACFT ENTERED A WINDSHEAR THAT SUDDENLY NOSED THE ACFT OVER IN AN APRX 75 DEG VERTICAL DIVE. JUST PRIOR TO COLLIDING WITH TREES, THE PLT WAS ABLE TO REGAIN SOME CONTROL OF THE ACFT AND COLLIDED WITH THE TERRAIN IN AN APRX 45 DEG ATTITUDE. IN THESE MOUNTAINS A CATABATIC WIND OFTEN FLOWS DOWNSLOPE AS SOLAR HEAT IS RADIATED FROM THE TERRAIN, COOLING THE TERRAIN SURFACE. THE TRADE WINDS CROSS THE RIDGES OBLIQUELY RESULTING IN EDDIES THAT PRODUCE OFF RIDGE FLOW. WHEN THE EDDIES AND CATABATIC GUSTS COINCIDE, A WIND SHEAR CAN OCCUR.
Full Narrative
DURING A LOCAL SIGHTSEEING FLT ALONG A RIDGE LINE, WHILE MANEUVERING AROUND A CLOUD BUILD-UP, THE ACFT ENTERED A WINDSHEAR THAT SUDDENLY NOSED THE ACFT OVER IN AN APRX 75 DEG VERTICAL DIVE. JUST PRIOR TO COLLIDING WITH TREES, THE PLT WAS ABLE TO REGAIN SOME CONTROL OF THE ACFT AND COLLIDED WITH THE TERRAIN IN AN APRX 45 DEG ATTITUDE. IN THESE MOUNTAINS A CATABATIC WIND OFTEN FLOWS DOWNSLOPE AS SOLAR HEAT IS RADIATED FROM THE TERRAIN, COOLING THE TERRAIN SURFACE. THE TRADE WINDS CROSS THE RIDGES OBLIQUELY RESULTING IN EDDIES THAT PRODUCE OFF RIDGE FLOW. WHEN THE EDDIES AND CATABATIC GUSTS COINCIDE, A WIND SHEAR CAN OCCUR.
Flight
Event TypeAccident
Event Time16:00 HST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSchweizer SGS2-33
Tail NumberN11468
Aircraft CategoryGli
DamageDestroyed
OperatorHonolulu Soaring Club
Operating RulePart 91
Engine TypeUnknown
Engine DetailsUnknown
Seats3
People & Injuries
Injury Summary3 injuries (1 serious injury, 2 minor injuries)
Fatal0
Serious1
Minor2
Uninjured0
Total3
Crew 1Age 66 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind50° @ 15 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point63 F
Altimeter29.00 inHg
Weather SourceWIT