DEN08LA137

NTSB accident investigation · Schempp-Hirth Ventus 2A · Brackettville, TX · August 9, 2008

Accident · Serious injuriesLimited investigationFinal report
Date
August 9, 2008, 15:32 local (20:32 UTC)
Place
Brackettville, TX
Injuries
1 serious, 1 uninjured
Phase of flight
Enroute
Aircraft
N777UNSchempp-Hirth Ventus 2AN110RGAB Sportine Aviacija Genesis 2
Defining events
Enroute-cruise: Midair collisionEnroute-climb to cruise: Midair collision
Weather
Visual (VMC) · Day
Status
Completed · report January 29, 2009
Report
Approved by Office Director
Parties
FAA Flight Standards District Office
Case key
68667

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The failure of the pilot of N777UN to exit the thermal upon losing visual contact with the other gliders, resulting in a midair collision.

The failure of the pilot of N777UN to exit the thermal upon losing visual contact with the other gliders, resulting in a midair collision.

Findings · 5

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

N777UN · Schempp-Hirth Ventus 2A

Action: lack of actionPersonnel issues › Action/decision · PilotAll aircraft: 792 casesProbable cause
Use of equip/info: use of policy/procedurePersonnel issues › Task performance · PilotAll aircraft: 191 casesProbable cause

N110RG · AB Sportine Aviacija Genesis 2

AircraftAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleAB Sportine Aviacija GENESIS 2: 1 caseAll aircraft: 63 cases
Use of equip/info: use of policy/procedurePersonnel issues › Task performance · Pilot of other aircraftAB Sportine Aviacija GENESIS 2: 1 caseAll aircraft: 191 casesProbable cause
Action: lack of actionPersonnel issues › Action/decision · Pilot of other aircraftAB Sportine Aviacija GENESIS 2: 1 caseAll aircraft: 792 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

N777UN · Schempp-Hirth Ventus 2A

Midair collisionEnroute-cruiseAll aircraft: 196 casesDefining event

Analysis

According to the pilot of N110RG, he was stabilized in a right 55 degree bank and had completed three turns when he heard a loud bang and immediately "lost control." The right wing dropped, the glider rolled to the right, and went inverted. The pilot of N110RG exited the glider and deployed his parachute. During the egress he was seriously injured. According to the pilot of N777UN, he had observed two gliders in the thermal in front of him and entered the thermal underneath them. After two turns in the thermal, he lost sight of the two gliders and collided, shortly thereafter, with N110RG. His left wing and winglet impacted the right wing of the other glider. The pilot of N777UN landed uneventfully. N110RG was destroyed and N777UN sustained minor damage. The damage to the right wing, sustained during the collision, rendered N110RG uncontrollable. Soaring procedure recommend that the pilot exit a thermal if visual contact is lost with another glider and cannot be established via a radio call.

According to the pilot of N110RG, he was stabilized in a right 55 degree bank and had completed three turns when he heard a loud bang and immediately "lost control." The right wing dropped, the glider rolled to the right, and went inverted. The pilot of N110RG exited the glider and deployed his parachute. During the egress he was seriously injured. According to the pilot of N777UN, he had observed two gliders in the thermal in front of him and entered the thermal underneath them. After two turns in the thermal, he lost sight of the two gliders and collided, shortly thereafter, with N110RG. His left wing and winglet impacted the right wing of the other glider. The pilot of N777UN landed uneventfully. N110RG was destroyed and N777UN sustained minor damage. The damage to the right wing, sustained during the collision, rendered N110RG uncontrollable. Soaring procedure recommend that the pilot exit a thermal if visual contact is lost with another glider and cannot be established via a radio call.

Factual narrative

On August 9, 2008, at 1532 central daylight time, a Schempp-Hirth Ventus 2A glider, N777UN, collided with an AB Sportine Aviacija Genesis 2 glider, N110RG, during a sailplane race six miles north of Brackettville, Texas. Visual meteorological conditions prevailed at the time of the accident. The local flights were being conducted under the provisions of Title 14 Code of Federal Regulations Part 91 without flight plans. The pilot of N777UN was uninjured, while the pilot of N110RG sustained serious injuries. Both flights departed Garner Field Airport (UVA), Uvalde, Texas, approximately 1300.

The gliders involved in this midair collision were competing in the Soaring Society of America, 15 meter class National Sailplane Race.

According to a telephone conversation with and subsequent accident report form submitted by the pilot of N110RG, he was following behind another glider at an altitude of 5,000 feet, heading for the first turn point in the competition. The glider in front of him entered a thermal and the pilot of N110RG established visual contact with the other pilot before entering the thermal behind him. He stabilized a right 55 degree bank and had completed three turns when he heard a loud bang and immediately "lost control." The right wing dropped, the glider rolled to the right, and went inverted. The pilot of N110RG exited the glider and deployed his parachute. During the egress, he was struck in the neck by some portion of the glider. The parachute deployed without issue; however, the landing was hard, resulting in serious injuries.

According to the Federal Aviation Administration (FAA) inspector who traveled to the accident, N110RG impacted terrain six miles north of Brackettville. The glider wreckage was inverted and exhibited signatures of a "right hand spin" prior to impact. A "heavy rub mark and gash" was noted on the bottom side of the right wing. The gash transitioned into a tear and partial separation of fiberglass. Material and paint transfer in the gash were consistent with the winglet of N777UN. The inspector stated that this damage would have inhibited the use of the right aileron and spoileron.

According to a telephone conversation with and subsequent accident report form submitted by the pilot of N777UN, he had observed two gliders in the thermal in front of him and entered the thermal underneath them. After two turns in the thermal, he lost sight of the two gliders and collided, shortly thereafter, with N110RG. His left wing and winglet impacted the right wing of the other glider. The pilot of N777UN landed uneventfully at UVA.

The FAA inspector reported that the winglet on N777UN was swept back 45 degrees. Material and paint transfer in the winglet were consistent with the surface area of the wing of N110RG.

According to the FAA Glider Flying Handbook - Chapter 10, Soaring Techniques, it is recommended that if the pilot looses sight of another glider in a thermal and cannot establish position via radio contact, "leave the thermal." Radio procedures during a soaring competition are not permitted.

On August 9, 2008, at 1532 central daylight time, a Schempp-Hirth Ventus 2A glider, N777UN, collided with an AB Sportine Aviacija Genesis 2 glider, N110RG, during a sailplane race six miles north of Brackettville, Texas. Visual meteorological conditions prevailed at the time of the accident. The local flights were being conducted under the provisions of Title 14 Code of Federal Regulations Part 91 without flight plans. The pilot of N777UN was uninjured, while the pilot of N110RG sustained serious injuries. Both flights departed Garner Field Airport (UVA), Uvalde, Texas, approximately 1300.

The gliders involved in this midair collision were competing in the Soaring Society of America, 15 meter class National Sailplane Race.

According to a telephone conversation with and subsequent accident report form submitted by the pilot of N110RG, he was following behind another glider at an altitude of 5,000 feet, heading for the first turn point in the competition. The glider in front of him entered a thermal and the pilot of N110RG established visual contact with the other pilot before entering the thermal behind him. He stabilized a right 55 degree bank and had completed three turns when he heard a loud bang and immediately "lost control." The right wing dropped, the glider rolled to the right, and went inverted. The pilot of N110RG exited the glider and deployed his parachute. During the egress, he was struck in the neck by some portion of the glider. The parachute deployed without issue; however, the landing was hard, resulting in serious injuries.

According to the Federal Aviation Administration (FAA) inspector who traveled to the accident, N110RG impacted terrain six miles north of Brackettville. The glider wreckage was inverted and exhibited signatures of a "right hand spin" prior to impact. A "heavy rub mark and gash" was noted on the bottom side of the right wing. The gash transitioned into a tear and partial separation of fiberglass. Material and paint transfer in the gash were consistent with the winglet of N777UN. The inspector stated that this damage would have inhibited the use of the right aileron and spoileron.

According to a telephone conversation with and subsequent accident report form submitted by the pilot of N777UN, he had observed two gliders in the thermal in front of him and entered the thermal underneath them. After two turns in the thermal, he lost sight of the two gliders and collided, shortly thereafter, with N110RG. His left wing and winglet impacted the right wing of the other glider. The pilot of N777UN landed uneventfully at UVA.

The FAA inspector reported that the winglet on N777UN was swept back 45 degrees. Material and paint transfer in the winglet were consistent with the surface area of the wing of N110RG.

According to the FAA Glider Flying Handbook - Chapter 10, Soaring Techniques, it is recommended that if the pilot looses sight of another glider in a thermal and cannot establish position via radio contact, "leave the thermal." Radio procedures during a soaring competition are not permitted.

Aircraft · 2

Registration
N777UN
Reported as
Schempp-Hirth Ventus 2A
Category
Glider
Serial number
74
Airframe hours
1,283
Engine
Damage
Substantial damage
Flight
Air race/show · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · December 1, 2007
Departed
UVA · Uvalde, TX
Destination
UVA · Uvalde, TX
Registration
N110RG
Reported as
AB Sportine Aviacija Genesis 2
Category
Glider
Serial number
2005
Airframe hours
500
Engine
Damage
Substantial damage
Flight
Air race/show · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · February 1, 2008
Departed
UVA · Uvalde, TX
Destination
UVA · Uvalde, TX

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot, aircraft N777UN
Age
49
Injuries
None
Certificates
Airline transport, Flight engineer
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Last flight review
April 1, 2008
Seat
Center
Flight hours
25,000 total · 1,000 in this make and model · 7,000 as pilot in command · 50 in the last 90 days · 20 in the last 30 days · 5 in the last 24 hours
Role
Pilot, aircraft N110RG
Age
49
Injuries
Serious
Certificates
Commercial, Flight instructor
Last flight review
December 1, 2006
Seat
Center
Flight hours
699 total · 314 in this make and model · 623 as pilot in command · 36 in the last 90 days · 10 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
110° at 11 knots, gusting 14
Visibility
10 statute miles
Lowest ceiling
None
Temperature
99 °F, dew point 66 °F
Altimeter
29.87 inHg
Observed at
UVA, 45 nm away

FAA reports on this event · 2

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.