# Accident 19910701025659A: Bell 412, Grand Junction, CO, July 1, 1991

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 1, 1991, 15:00 local time
- Place: Grand Junction, CO
- Damage: Substantial damage
- Phase of flight: Pwr Off Run Land (Autorotation
- Operating rules: Air taxi and commuter (Part 135)
- Operator: CKLA
- Location: 39.0808° N, 108.5498° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=39.0808&lon=-108.5498&mi=10
- Aircraft: N20703 (not matched to a registry record)
- Reported make and model: BELL 412
- Reported engine: PWA PT6T3B
- People aboard: 3
- Fatal injuries: 0
- Pilot flight hours: 4,010 total, 300 in this make and model, 40 in the last 90 days
- NTSB investigation: [NTSB DEN91LA095](https://openairdocs.org/ntsb/DEN91LA095) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19910701025659A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

TRANMISSION MAIN DRIVE SHAFT DISENGAGED AND OVERHEATED. COLLAPSED SKIDS ON RUN ON AUTOROTATION IN SOFT GROUND.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB DEN91LA095](https://openairdocs.org/ntsb/DEN91LA095), Jul 1, 1991: Bell 412 (N20703), Grand Junction, CO, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN ADEQUATE MAIN ROTOR RPM PRIOR TO TOUCHDOWN. FACTORS WERE: THE DISCONNECTED ENGINE TO TRANSMISSION DRIVE SHAFT AND THE INADEQUATE INSPECTION BY COMPANY MAINTENANCE…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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