# Accident 20161218022589A: Robinson Helicopter R22 ALPHA, Hatcher Pass, AK, December 18, 2016

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: December 18, 2016, 11:10 local time
- Place: Hatcher Pass, AK
- Damage: Substantial damage
- Phase of flight: Landing: Approach
- Operating rules: General operating rules (Part 91)
- Location: 61.7672° N, 149.1378° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=61.7672&lon=-149.1378&mi=10
- Aircraft: N121MR, a cancelled registration (https://openairdocs.org/deregistered/N121MR-2018-04-04) (OpenAirDocs)
- Registry model: Robinson Helicopter R22 ALPHA (registry code 7640104, https://openairdocs.org/model/robinson-helicopter-r22-alpha) (OpenAirDocs)
- Registry engine: Amateur-built UNKNOWN ENG (registry code 99999, https://openairdocs.org/engine/amateur-built-unknown-eng) (OpenAirDocs)
- Reported make and model: ROBINSON HELICOPTER R22 ALPHA
- People aboard: 2
- Fatal injuries: 0
- Other injuries: 2
- Pilot certificates: Commercial pilot, flight instructor
- Pilot flight hours: 258 total, 161 in this make and model, 18 in the last 90 days
- NTSB investigation: [NTSB ANC17LA013](https://openairdocs.org/ntsb/ANC17LA013) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20161218022589A

## Narrative

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

ROTOR RPM DECAYED ON APPROACH TO PINNACLE, AIRCRAFT SETTLED ON STEEP TERRAIN.  TAIL ROTOR STRUCK HILL AND THE TAIL BOOM SEPERATED FROM THE AIRCRAFT.  THE AIRCRAFT ROLLED DOWN THE HILL.

## 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 ANC17LA013](https://openairdocs.org/ntsb/ANC17LA013), Dec 18, 2016: Robinson Helicopter R22 (N121MR), Palmer, AK, substantial damage. Probable cause: The pilot's failure to maintain main rotor revolutions per minute (RPM) during a pinnacle landing, which resulted in a main rotor stall condition, a loss of control, and a subsequent impact with…

## Other reports on N121MR (1)

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

- [Accident 20120421007209A](https://openairdocs.org/incident/20120421007209A), Apr 21, 2012: Robinson Helicopter R22 ALPHA (N121MR), Palmer, AK, Substantial damage. Pilot landed off airport in the snow. When collective was reduced a/c tilted to the rear. When pilot picked up the a/c the tail rotor struck the snow.

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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