# NTSB investigations: Lycoming T-53 series, WA

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 WPR22LA339](https://openairdocs.org/ntsb/WPR22LA339.md): Bell 205A-1 · Cougar, WA · Accident · Minor injuries · Class 3 · Limited · Final report · Sep 7, 2022 · N66HJ · Substantial damage
  > The helicopter’s encounter with downdrafts during a low-altitude hovering maneuver while dipping for water.
- [NTSB WPR15LA219](https://openairdocs.org/ntsb/WPR15LA219.md): Garlick UH1H · Walla Walla, WA · Accident · Minor injuries · Limited investigation · Final report · Jul 21, 2015 · N121PT · Destroyed
  > The helicopter’s reduction in aerodynamic lift while operating in variable wind conditions for reasons that could not be determined because postaccident examination did not reveal any evidence of preimpact mechanical malfunctions or failures that would have…
- [NTSB WPR14LA206](https://openairdocs.org/ntsb/WPR14LA206.md): Williams Helicopter UH 1H · Waitsburg, WA · Accident · Minor injuries · Limited investigation · Final report · May 23, 2014 · N260TA · Substantial damage
  > An extreme vibration immediately after entering forward flight for reasons that could not be determined because postaccident examination of the helicopter did not reveal any anomalies that would have precluded normal operation. Contributing to the accident…
- [NTSB SEA06LA162](https://openairdocs.org/ntsb/SEA06LA162.md): Kaman HH-43F · Metaline Falls, WA · Accident · 1 fatal · Limited investigation · Final report · Aug 18, 2006 · N559D · Destroyed
  > The failure of the left-hand cross-shaft input internal spline while the helicopter was in a hover, which resulted in the loss of gear box timing, in-flight blade contact and separation, and the subsequent loss of control and impact with a log deck.
- [NTSB SEA05CA086](https://openairdocs.org/ntsb/SEA05CA086.md): Williams Helicopter UH-1B · Uniontown, WA · Accident · No injuries · Data collection · Final report · Apr 25, 2005 · N334WN · Substantial damage
  > The pilot's failure to maintain clearance from an object while maneuvering, which resulted in the main rotor blades striking a power pole. The power pole was a factor in the accident.
- [NTSB SEA04LA043](https://openairdocs.org/ntsb/SEA04LA043.md): Garlick UH-1H · Liberty, WA · Accident · Serious injuries · Limited investigation · Final report · Feb 23, 2004 · N6257P · Substantial damage
  > The failure of the tail rotor slider lugs due to fatigue while the helicopter was maneuvering.
- [NTSB SEA99LA020](https://openairdocs.org/ntsb/SEA99LA020.md): Garlick UH-1H · Darrington, WA · Accident · Serious injuries · Limited investigation · Final report · Dec 14, 1998 · N94NW · Substantial damage
  > The total separation of the vertical fin (stabilizer), as the result of fatigue cracks which initiated in the fourth rivet hole above where the fin extends from the tailboom.
- [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 SEA90TL#03](https://openairdocs.org/ntsb/SEA90TL%2303.md): Bell UH-1B · Yakima, WA · Accident · No injuries · Class 3 · Final report · Jun 21, 1990 · N99634 · Substantial damage
- [NTSB SEA78FYE05](https://openairdocs.org/ntsb/SEA78FYE05.md): Bell 205A-1 · Castle Rock, WA · Accident · Minor injuries · Closed · Jan 13, 1978 · N67HJ · 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" = 'WA' AND c."eventCountry" = 'USA'
  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&state=WA

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