# NTSB investigations: Lycoming T-53 series, 1997

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 SEA98LA017](https://openairdocs.org/ntsb/SEA98LA017.md): Bell TH-1L · Canby, OR · Accident · Minor injuries · Limited investigation · Final report · Nov 25, 1997 · N8160G · Substantial damage
  > The pilot's allowance of excessive airspeed resulting in the long-line hook impacting the tail rotor, and his allowance of an airspeed bleed-off preventing a successful run-on landing due to a loss of yaw control.
- [NTSB SEA97LA198](https://openairdocs.org/ntsb/SEA97LA198.md): Garlick UH-1B · Dayville, OR · Accident · Serious injuries · Limited investigation · Final report · Aug 29, 1997 · N22753 · Substantial damage
  > Improper installation of the transmission door by a company mechanic, resulting in inflight separation of the door (which then struck the tail rotor system) and consequent total loss of the tail rotor. Contributing to the accident were: inadequate…
- [NTSB SEA97FA196](https://openairdocs.org/ntsb/SEA97FA196.md): Southern Aero UH-1B · Skykomish, WA · Accident · 1 fatal · Field investigation · Final report · Aug 27, 1997 · N896W · Substantial damage
  > A fatigue fracture in the main rotor mast, which resulted in an in flight separation of the main rotor from the helicopter. Contributing to the accident was insufficient Federal Aviation Administration airworthiness standards and requirements for the aircraft.
- [NTSB LAX97LA206](https://openairdocs.org/ntsb/LAX97LA206.md): Bell UH-1B · Heron, CA · Accident · No injuries · Limited investigation · Final report · Jun 11, 1997 · N888SJ · Destroyed
  > partial loss of engine power for undetermined reasons. A factor relating to the accident was that the engine lost power when the helicopter was outside (below) the limits of the height/velocity curve.
- [NTSB LAX97LA204](https://openairdocs.org/ntsb/LAX97LA204.md): Bell 204-B · Kaneohe, HI · Accident · No injuries · Limited investigation · Final report · Jun 6, 1997 · N64F · Substantial damage
  > failure of the pilot to verify that the load was properly rigged before attempting to pick it up. The uneven (sloping) terrain was a related factor.
- [NTSB MIA97TA139](https://openairdocs.org/ntsb/MIA97TA139.md): Bell 204-B · Calderwood, TN · Accident · No injuries · Final report · Apr 16, 1997 · N4580Y · Destroyed
  > The inadequate maintenance inspection of the helicopter resulting in loss of lubrication from the main drive shaft going undetected until failure of the drive shaft.
- [NTSB MIA97LA099](https://openairdocs.org/ntsb/MIA97LA099.md): Bell UH-1B · Labelle, FL · Accident · Minor injuries · Limited investigation · Final report · Mar 11, 1997 · N70696 · Destroyed
  > Company maintenance personnel's failure to properly evaluate a main rotor system problem resulting in main rotor straps with multiple laminates separated due to fatigue cracking being allowed to continue in service until failure and separation of a main rotor…

## 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 year(c."eventDate") = 1997
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41552', '41549', '41587'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41552&year=1997

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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.