# Main rotor brake

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft propeller/rotor](https://openairdocs.org/ntsb-findings/0104) › [Main rotor drive](https://openairdocs.org/ntsb-findings/010463) › Main rotor brake
- NTSB code: 01046321
- Cases: 1
- In the probable cause: 0
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01046321/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01046321/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01046321

## Cases per year (in the probable cause / all)

- 2015: 0 / 1

## Defining events in these cases

- [Loss of control on ground](https://openairdocs.org/ntsb-events/230): 1 cases

## Aircraft models (registry)

- [Paquin Michael A A](https://openairdocs.org/model/paquin-michael-a-a): 1 cases

## Other findings in the same cases

- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases
- [Forgotten action/omission](https://openairdocs.org/ntsb-findings/02041035) (Personnel issues): 1 cases
- [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 1 cases

## Newest cases

- [NTSB GAA15CA127](https://openairdocs.org/ntsb/GAA15CA127), Jun 20, 2015: Paquin Michael A A (N485MP), Concord, NH, substantial damage. Probable cause: The pilot's inability to maintain directional control during takeoff, which resulted in a roll over. Contributing to the loss of control was the pilot's failure to disengage the main rotor brake…

NTSB has coded findings and defining events since 2008; earlier cases used its older occurrence and cause codes and aren't counted.

Findings: https://openairdocs.org/ntsb-findings.md. Defining events: https://openairdocs.org/ntsb-events.md. Phases of flight: https://openairdocs.org/ntsb-phases.md. Every investigation, filtered by finding, event, phase, state, year or model: https://openairdocs.org/ntsb.md (for example ?state=MI&fatal=1).

NTSB's definitions: Accident and incident, 49 CFR 830.2 (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-VIII/part-830/subpart-A/section-830.2), CICTT occurrence categories (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/OccurrenceCategoryDefinitions.pdf), CICTT phases of flight (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/PhaseofFlightDefinitions.pdf), and NTSB coding manual, before 2008 (PDF) (https://www.ntsb.gov/GILS/Documents/codman.pdf). NTSB publishes no definitions for its findings, only their names.

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