Robinson R22 BETA N27AT

Summary

On 23 December 2012 at about 16:30 local time, a Robinson R22 BETA registered N27AT was involved in an accident near Corcoran, Minnesota, United States. One person was on board and one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

23 December 2012 at 16:30

Classification

Accident

Location

Corcoran, Minnesota, United States

Coordinates

45.1481, -93.5389

Aircraft

Robinson R22 BETA

Registration

N27AT

Category

Helicopter

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

St. Michael → Corcoran

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CEN13LA115

1 person had minor injuries.

The pilot’s improper decision to land the helicopter in a position that placed the tail rotor near tarps, which resulted in the tarps being lifted into the tail rotor, subsequent tail rotor damage, a loss of tail rotor authority, and an uncommanded tail rotor rotation.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

Before landing, the pilot hovered the helicopter about 10 feet above the ground to see if tarps covering the north half of the concrete helipad would move, and he then decided to continue the landing. The helicopter approached from the north, which placed the tail rotor over the tarps. The area south of the helipad was free of obstructions. While the pilot was shutting down the helicopter after landing, the helicopter made an uncommanded counterclockwise rotation of about 40 degrees. The pilot applied corrective pedal input with no response. The helicopter then rotated about three full revolutions before the tail boom and main rotors struck a nearby parked trailer, and a fire ensued. Postaccident examination of the helicopter did not reveal any preimpact anomalies; however, the examination was limited due to extensive impact and postimpact fire damage. Examination of the accident site revealed several cuts in the tarp in the area where the tail boom was positioned during landing. Although the pilot reported that the tarp did not impact the tail rotor, the evidence suggests that the tarp was lifted into the tail rotor during the shutdown, which likely caused damage to the tail rotor blades and resulted in a loss of tail rotor authority and the subsequent uncommanded rotation. Further, because the area south of the pad was free of obstructions and the reported wind was variable at 2 knots, the pilot could have landed the helicopter facing north, which would have placed the tail rotor over the unobstructed ground south of the helipad.

Quoted verbatim from the NTSB record.