# NTSB investigations: Allison 250-C20 series, PR

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 ERA18LA183](https://openairdocs.org/ntsb/ERA18LA183.md): Bell 206 · Rio Grande, PR · Accident · 1 fatal · Limited investigation · Final report · Jun 30, 2018 · N10CV · Substantial damage
  > A total loss of engine power due to oil exhaustion, which resulted in an uncontrolled descent and hard landing.
- [NTSB ERA18LA091](https://openairdocs.org/ntsb/ERA18LA091.md): Hughes 369 · San Juan, PR · Accident · Serious injuries · Limited investigation · Final report · Jan 11, 2018 · N571HH · No damage
  > The helicopter pilot's improper decision to use an open-end grapple, instead of an A-frame attachment, to lift and move a ladder with a lineman on it and the lineman's improper decision to be lifted on a ladder via an open-end grapple, which were contrary to…
- [NTSB NYC07LA149](https://openairdocs.org/ntsb/NYC07LA149.md): Messerschmitt BO-105 · Isla de Vieques, PR · Accident · No injuries · Limited investigation · Final report · May 28, 2007 · N911GB · Substantial damage
  > The mechanic's failure to secure the engine governor locking hardware, which resulted in the right engine losing power.
- [NTSB MIA06LA044](https://openairdocs.org/ntsb/MIA06LA044.md): MBB BO-105S · Ponce, PR · Accident · Minor injuries · Limited investigation · Final report · Jan 12, 2006 · N495LF · Substantial damage
  > A loose B-nut on the PC line connecting the power turbine governor (PTGOV) to the fuel control unit (FCU) that created a leak and caused the engine to roll back to an idle condition, causing a low hydraulic system pressure and subsequent control lock. A…

## 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" = 'PR' 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 ('03020'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03020&state=PR

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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.