# NTSB investigations, AZ: Mast bumping

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 WPR19FA109](https://openairdocs.org/ntsb/WPR19FA109.md): Bell 206 · Fort McDowell, AZ · Accident · 2 fatal · Class 3 · Field · Final report · Apr 16, 2019 · N61PH · Destroyed
  > The separation of the main rotor head from the mast as a result of a sudden displacement of the cyclic stick during a low-G maneuver, leading to mast bumping. Contributing to the accident were the unsecure positioning of the flight test engineer’s laptop…
- [NTSB WPR16FA130](https://openairdocs.org/ntsb/WPR16FA130.md): Robinson Helicopter R66 · Wikieup, AZ · Accident · 2 fatal · Field investigation · Final report · Jun 23, 2016 · N117TW · Destroyed
  > An encounter with turbulence due to updrafts and/or dust devils that resulted in mast bumping and an in-flight break-up.
- [NTSB WPR15LA177](https://openairdocs.org/ntsb/WPR15LA177.md): Bell 206 L4 · Dewey, AZ · Accident · No injuries · Limited investigation · Final report · Jun 2, 2015 · N73AW · Substantial damage
  > A total loss of engine power due to the failure of the No. 2 bearing, which resulted from a fractured separator.
- [NTSB WPR13FA417](https://openairdocs.org/ntsb/WPR13FA417.md): Bell UH-1V · Cordes Lakes, AZ · Accident · 2 fatal · Field investigation · Final report · Sep 21, 2013 · N22490 · Destroyed
  > The pilot's improper maintenance on the helicopter’s main rotor blade pitch control system, which resulted in an in-flight loss of main rotor blade pitch control, mast bumping, and mast failure.

## 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" = 'AZ' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '245' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/245/sequence?state=AZ

---
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.