# Main rotor indicating system

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft propeller/rotor](https://openairdocs.org/ntsb-findings/0104) › [Main rotor system](https://openairdocs.org/ntsb-findings/010462) › Main rotor indicating system
- NTSB code: 01046240
- Cases: 1
- In the probable cause: 1
- Fatal cases: 1
- All cases: https://openairdocs.org/ntsb-findings/01046240/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01046240/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01046240

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

- 2020: 1 / 1

## Defining events in these cases

- [Off-field or emergency landing](https://openairdocs.org/ntsb-events/440): 1 cases

## Aircraft models (registry)

- [Hughes Helicopters HUGHES 369D](https://openairdocs.org/model/hughes-helicopters-hughes-369d): 1 cases

## Other findings in the same cases

- [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 1 cases
- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases
- [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 1 cases
- [Lack of action](https://openairdocs.org/ntsb-findings/02041030) (Personnel issues): 1 cases
- [Descent rate](https://openairdocs.org/ntsb-findings/01062037) (Aircraft): 1 cases

## Newest cases

- [NTSB CEN21LA102](https://openairdocs.org/ntsb/CEN21LA102), Dec 29, 2020: Hughes 369D (N103SU), Tuckers Crossing, MS, destroyed, 1 fatal. Probable cause: The pilot’s loss of helicopter control when the external saw contacted trees during an attempted emergency landing due to a main rotor transmission oil pressure warning. The reason that the pilot did…

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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