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NTSB Report
June 22, 2017 · Schempp-Hirth Discus 2B NO Series · N21TH
Bishop, CA
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
June 22, 2017
Injury Outcomes
1 injury (1 minor injury)
Location
Bishop, CA
Aircraft
Schempp-Hirth Discus 2B NO Series (2001)
Tail Number
N21TH
Operator
Bay Area Soaring Associates
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
GAA17CA368
The pilot of the glider reported that, while circling over rising mountainous terrain in search of thermals, he approached a "ridge right in front of me [him]." He added that, at that moment, "the [flight] controls went soft [and] I [he] could see that I [he] was [aerodynamically] stalled and plummeting toward the terrain and trees below." He further added that he "pointed the [glider's] nose down at a steep angle" to gain airspeed, but the glider impacted trees and steep terrain. The fuselage and both wings sustained substantial damage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the glider that would have precluded normal operation.
NTSB Probable Cause
The pilot’s exceedance of the glider’s critical angle of attack while maneuvering over rising mountainous terrain, which resulted in an aerodynamic stall.
Full Narrative
The pilot of the glider reported that, while circling over rising mountainous terrain in search of thermals, he approached a "ridge right in front of me [him]." He added that, at that moment, "the [flight] controls went soft [and] I [he] could see that I [he] was [aerodynamically] stalled and plummeting toward the terrain and trees below." He further added that, he "pointed the [glider's] nose down at a steep angle" to gain airspeed, but the glider impacted trees and steep terrain. The fuselage and both wings sustained substantial damage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the glider that would have precluded normal operation.
Flight
Event TypeAccident
Event Time13:00 PDT
Nearest Airport0nm
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSchempp-Hirth Discus 2B NO Series
Tail NumberN21TH
Aircraft CategoryGli
DamageSubstantial
OperatorBay Area Soaring Associates
Operating RulePart 91
Engine TypeNone
Engine DetailsNone
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 59 · None · Minor
Conditions
ConditionsVMC
LightDaylight
Wind4 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point10 C / 28 C
Altimeter29.90 inHg
Observation Time21:56
Weather SourceWFAC