CEN14LA372 · Jonker Sailplanes (PTY) Ltd JS1-C
Jonker Sailplanes (PTY) Ltd JS1-C · Accident: loss of control in flight en route
From GHSA-Wallis Glideport (TE71) to GHSA-Wallis Glideport (TE71)
Event
- NTSB case
- CEN14LA372
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 1 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Jonker Sailplanes (PTY) Ltd JS1-C
- Aircraft type
- Jonker Sailplanes (pty) JS1
- Category
- Glider
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N60XJ
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From GHSA-Wallis Glideport (TE71), Wallis, TXTo GHSA-Wallis Glideport (TE71), Wallis, TX
- Aircraft age
- About 1 year (built 2013)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- En route · cruise
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of control in flight
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Aircraft › Aircraft oper/perf/capability
- Not determined › Not determined
- Personnel issues › Task performance
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
About 30 minutes after takeoff, witnesses informed pilots at the departure airport that they heard a high-pitched sound followed by the sound of an impact. The glider was subsequently located in an open field about 1 1/2 miles from the airport. There were no eyewitnesses to the accident. A postaccident examination of the glider did not reveal any anomalies consistent with a preimpact failure or malfunction. Local weather conditions about the time of the accident were favorable for a glider flight.
The pilot did not hold a current Federal Aviation Administration airman medical certificate nor was one required for glider operations. A friend of the pilot reported that the pilot had suffered a stroke about 10 years before the accident. Further, toxicological testing detected several medications commonly used to treat conditions that could be impairing as well as two medications that might also cause impairment. However, the available information was insufficient to determine whether the pilot was impaired by a medical condition or the use of a medication at the time of the accident. In addition, although ethanol was detected in the pilot's liver, it was likely produced postmortem.
Probable cause
The pilot’s loss of glider control and its subsequent impact with terrain for reasons that could not be determined due to a lack of available information.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CEN14LA372
- Event ID
- 20140717X31349
- Case number
- CEN14LA372
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: a1e31e00db4b0fa45f79bef8673e6955157944c9a0dfe45086b6a54de2fb2d6d; retrieved 2026-09-14T17:21:43.162Z.