# Accident 19900429013099A: Robsin R22, Mammoth, CA, April 29, 1990

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 29, 1990, 07:10 local time
- Place: Mammoth, CA
- Damage: Substantial damage
- Phase of flight: Low Level Operations
- Operating rules: General operating rules (Part 91)
- Location: 37.5797° N, 118.8400° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=37.5797&lon=-118.8400&mi=10
- Aircraft: N8560M, registered now (https://openairdocs.org/aircraft/N8560M) (OpenAirDocs)
- Registry model: Robinson Helicopter R22 (registry code 7640102, https://openairdocs.org/model/robinson-helicopter-r22) (OpenAirDocs)
- Registry engine: Lycoming 0-320 series (registry code 41508, https://openairdocs.org/engine/lycoming-0-320-series) (OpenAirDocs)
- Reported make and model: ROBSIN R22
- Reported engine: LYC O320B2C
- Fatal injuries: 0
- NTSB investigation: [NTSB LAX90LA157](https://openairdocs.org/ntsb/LAX90LA157) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19900429013099A

## Narrative

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

FLYING LOW IN MOUNTAIN TERRAIN GOT UNCONTROLLABLE DOWNDRAFT. COLLIDEW WITH 7000FT TERRAIN.

## 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 LAX90LA157](https://openairdocs.org/ntsb/LAX90LA157), Apr 29, 1990: Robinson R22 (N8560M), Mammoth Lakes, CA, substantial damage. Probable cause: PILOT'S ENCOUNTER WITH A STRONG DOWNDRAFT WHILE CRUISING AT AN INADEQUATE ALTITUDE. A CONTRIBUTING FACTOR WAS THE HIGH ALTITUDE WHICH LIMITED AVAILABLE ENGINE POWER FOR RECOVERY.

## Other reports on N8560M (1)

Matched to the same aircraft by N-number and date.

- [Incident 19890414020029I](https://openairdocs.org/incident/19890414020029I), Apr 14, 1989: Robsin R22 (N8560M), Bandera, WA. Struck hidden metal bars while practicing auto rotational landing in a field. Instructor took over and landed.

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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