# NTSB investigations: Let BLANIK L-13, CO

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

## Latest cases

- [NTSB DEN04CA085](https://openairdocs.org/ntsb/DEN04CA085.md): Let Blanik L-13 · Durango, CO · Accident · Serious injuries · Data collection · Final report · Jun 3, 2004 · N99860 · Substantial damage
  > the pilot's improper in-flight planning and decision and his failure to maintain adequate terrain clearance. Contributing to the accident was the lack of suitable terrain, and the low approach.
- [NTSB FTW97LA256](https://openairdocs.org/ntsb/FTW97LA256.md): Let Blanik L-13 · Pagosa Springs, CO · Accident · Minor injuries · Limited investigation · Final report · Jul 4, 1997 · N65378 · Substantial damage
  > The pilot's improper inflight planning in that he allowed the glider to descend to too low an altitude and stray too far from the airport, exceeding the aircraft's glide capabilities. A factor was his failure to utilize maximum braking action.
- [NTSB FTW95LA405](https://openairdocs.org/ntsb/FTW95LA405.md): Let Blanik L-13 · Como, CO · Accident · Minor injuries · Limited investigation · Final report · Sep 24, 1995 · N38924 · Substantial damage
  > The pilot allowing the glider to develop an excessive descent rate. A factor was the premature and automatic disengagement of the winch-tow system.
- [NTSB DEN93LA085](https://openairdocs.org/ntsb/DEN93LA085.md): Let L-13 · Durango, CO · Accident · Minor injuries · Limited investigation · Final report · Jul 24, 1993 · N48069 · Destroyed
  > The failure of the tow plane pilot to warn the glider pilot that he was releasing the tow line. A factor was: an inadvertent stall by the pilot in command.
- [NTSB DEN91LA118](https://openairdocs.org/ntsb/DEN91LA118.md): Let L-13 · Aspen, CO · Accident · No injuries · Limited investigation · Final report · Aug 25, 1991 · N2238 · Substantial damage
  > The pilot turning off the runway with excessive speed.
- [NTSB DEN89LA210](https://openairdocs.org/ntsb/DEN89LA210.md): Let L-13 · Buena Vista, CO · Accident · 1 fatal · Limited investigation · Final report · Sep 16, 1989 · N3458 · Substantial damage
  > A premature release of the glider tow line by the glider pilot and his failure to maintain sufficient airspeed, while maneuvering back toward the runway, which resulted in an inadvertent stall.
- [NTSB DEN87LA236](https://openairdocs.org/ntsb/DEN87LA236.md): Let L-13 · Buena Vista, CO · Accident · No injuries · Limited investigation · Final report · Sep 5, 1987 · N38924 · Substantial damage
  > The plt was ferrying the glider to Buena Vista, Colorado & had previously obtained permission to land on a closed rwy. After being towed to the Buena Vista area, he released the glider from the tow plane & flew in the local area for about 40 min. He then…
- [NTSB DEN81FA053](https://openairdocs.org/ntsb/DEN81FA053.md): Let Blanik · Aspen, CO · Accident · 2 fatal · Closed · Jul 26, 1981 · N38928 · Destroyed
- [NTSB DEN77FTE33](https://openairdocs.org/ntsb/DEN77FTE33.md): Blanik L-13 · Boulder, CO · Accident · No injuries · Closed · Apr 9, 1977 · N3458 · Substantial damage
- [NTSB DEN7LAD008](https://openairdocs.org/ntsb/DEN7LAD008.md): Blanik L-13 · Aspen, CO · Accident · 2 fatal · Closed · Aug 9, 1975 · N9915 · Destroyed

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."eventStateOrRegion" = 'CO' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('1360306'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=1360306&state=CO

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