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Atlas / NTSB / WPR11CA411

NTSB CAROL · Event

Event WPR11CA411

2011-08-28 Warner Springs, California, United States Serious 1 aircraft Status: Completed

Aircraft involved

Probable cause & findings

The pilot’s inadequate altitude to clear a ridgeline while maneuvering over a mountainous area.

Factual narrative

According to the pilot, his release from the tow plane was normal. The pilot released the tow rope at 7,100 feet mean sea level (msl) while over a 6,500-foot mean sea level (msl) mountaintop for a planned 1/2-hour sightseeing flight. Little to no indication of lift was noted in the area, and the pilot reversed course. When the glider had descended to 6,900 feet msl and was continuing to rapidly descend, the pilot again reversed course toward lower elevation terrain. The glider’s altitude was insufficient to clear a ridgeline. On the side of the mountain, about 6,400 feet msl, the glider impacted rocks, trees, and shrubs, which resulted in breakage of the glider’s wings, and serious injuries to the pilot. According to the pilot, his release from the tow plane was normal. He released the tow rope at 7,100 feet mean sea level (msl) while over a 6,500-foot msl mountaintop for a planned 1/2-hour sightseeing flight. Little to no indication of lift was noted in the area, and the pilot reversed course. When the glider had descended to 6,900 feet msl and was continuing to rapidly descend, the pilot again reversed course toward lower elevation terrain. The glider’s altitude was insufficient to clear a ridgeline. On the side of the mountain, about 6,400 feet msl, the glider impacted rocks, trees, and shrubs, which resulted in the glider’s wings breaking. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).

  • Environmental issues-Conditions/weather/phenomena-(general)-(general)-Contributed to outcome
  • C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Altitude-Attain/maintain not possible - C
  • C Personnel issues-Task performance-Use of equip/info-Aircraft control-Pilot - C

Verbatim from NTSB's published report. Source file NTSB_2011_WPR11CA411.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.