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ASN Wikibase Occurrence # 145275
Last updated: 22 October 2017
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Type:Silhouette image of generic R22 model; specific model in this crash may look slightly different
Robinson R22 Beta
Owner/operator:Castor Aviation Ltd
Registration: N121MR
C/n / msn: 0496
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Airplane damage: Substantial
Location:5 miles west of Palmer, Alaska -   United States of America
Phase: Landing
Departure airport:Palmer, Alaska
Destination airport:5 miles west of Palmer, Alaska
Investigating agency: NTSB
The helicopter, a Robinson R22 Beta, N121MR, struck the tail rotor on landing, about 5 miles west of Palmer, Alaska.
The pilot flew to a practice area and landed the helicopter on what the pilot thought was firm snow. As he landed, the helicopter suddenly broke through the surface and its tail rotor struck the snow. The pilot re-positioned the helicopter and the tail rotor gearbox chip detector light illuminated. An examination showed that the tail-rotor driveshaft had sheared.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows: The pilot's selection of unsuitable terrain for landing, which resulted in a tail rotor strike.


1. NTSB Identification: ANC12CA032 at
2. FAA:
5. (photo)

Revision history:

24-Apr-2012 12:34 gerard57 Added
24-Apr-2012 17:13 Geno Updated [Cn, Operator, Phase, Source, Damage, Narrative]
24-Apr-2012 18:28 RobertMB Updated [Time, Aircraft type, Location, Source, Narrative]
10-Oct-2016 16:30 Dr.John Smith Updated [Operator, Location, Departure airport, Destination airport, Source, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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