# NTSB investigations: Let BLANIK L-13: Loss of control - in flight

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 SEA96FA186](https://openairdocs.org/ntsb/SEA96FA186.md): Let L-13 · Shelton, WA · Accident · 1 fatal · Field investigation · Final report · Aug 11, 1996 · N90865 · Substantial damage
  > failure of the operator to provide its pilots with information essential for an accurate determination of the glider's weight and balance, the resultant operation of the glider with a center-or-gravity that exceeded the aft limit, and the pilot's inadvertent…
- [NTSB BFO94LA074](https://openairdocs.org/ntsb/BFO94LA074.md): Let Blanik L-13 · Plymouth, MA · Accident · No injuries · Limited investigation · Final report · Apr 23, 1994 · N2167 · Substantial damage
  > The pilot's failure to maintain adequate airspeed.
- [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 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 LAX89LA027](https://openairdocs.org/ntsb/LAX89LA027.md): Let L-13 · Marana, CA · Accident · 1 fatal · Limited investigation · Final report · Oct 29, 1988 · N90848 · Substantial damage
  > The pilot reported that shortly after liftoff from runway 26 the control stick became difficult to move. He decided to continue the air tow and release at 200 feet AGL after release, the pilot turned the glider to return to the runway to land. He was still…
- [NTSB FTW87LA199](https://openairdocs.org/ntsb/FTW87LA199.md): Let L-13 · Littlefield, TX · Accident · No injuries · Limited investigation · Final report · Aug 16, 1987 · N9997Q · Substantial damage
  > The pilot activated the flaps while on final approach instead of the spoilers. When the glider did not descend as he expected, a left 360 degree turn was initiated to lose altitude. The pilot stated that he then unintentionally stalled the aircraft while in…
- [NTSB CHI86LA133](https://openairdocs.org/ntsb/CHI86LA133.md): Let L-13 · Gregory, MI · Accident · No injuries · Limited investigation · Final report · Apr 27, 1986 · N30LH · Substantial damage
  > The pilot stated that during landing the right wing of the glider touched the ground causing a right turn. The left wing then caught on a truck tire causing a 70 degree turn to the left. The glider was stopped when the right wing struck a barn. He was later…

## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('1360306')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 250))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=1360306&occurrence=250

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OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.