# NTSB Accident ANC17LA013
> **ROBINSON HELICOPTER R22** · 2016-12-18 · Palmer, AK, USA · MINR
## Event
- **NTSB number:** ANC17LA013
- **Event ID:** 20161219X44123
- **Type:** Accident
- **Date:** 2016-12-18
- **Location:** Palmer, AK, USA
- **Coordinates:** 61.767223, -149.137771
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 2
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** ROBINSON HELICOPTER
- **Model:** R22
- **Registration:** N121MR
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## 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 terrain. A contributing factor was the flight instructor's failure to monitor the main rotor RPM during the pinnacle landing.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC17LA013) · AI Analytics · CC0 1.0*