Friday, September 15, 2017

Bell 407, N508MT, Med-Trans Corporation: Incident occurred September 14, 2017 in Hochatown, McCurtain County, Oklahoma

Federal Aviation Administration / Flight Standards District Office; Oklahoma

Rotorcraft auto-rotated into a field.

Med-Trans Corporation: http://registry.faa.gov/N508MT

Date: 14-SEP-17
Time: 17:30:00Z
Regis#: N508MT
Aircraft Make: BELL
Aircraft Model: B407
Event Type: INCIDENT
Highest Injury: NONE
Aircraft Missing: No
Damage: NONE
Activity: OTHER
Flight Phase: LANDING (LDG)
Operation: 91
City: HOCHATOWN
State: OKLAHOMA

Prior Accident occurred December 20, 2003:

Operator: Med-Trans Corporation OFC

Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Aviation Accident Data Summary - National Transportation Safety Board: https://app.ntsb.gov/pdf

NTSB Identification: NYC04CA049
14 CFR Part 91: General Aviation
Accident occurred Saturday, December 20, 2003 in Morehead, KY
Probable Cause Approval Date: 03/30/2004
Aircraft: Bell B407, registration: N508MT
Injuries: 3 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

After two reconnaissance flights over the landing zone, the pilot initiated an approach. The pilot then performed a go-around due to blowing snow, and completed a third reconnaissance flight over the landing zone. During the second approach, the tail rotor struck a standing frost free hydrant. The hydrant was approximately 1 inch in diameter and 3 feet high. The helicopter subsequently spun right and the pilot performed a hovering autorotation to the ground. Ground personnel had marked the perimeter of the landing zone with lights. However, the ground personnel later stated that they had not walked the interior of the landing zone and were unaware of the obstacle.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The ground personnel's failure to identify the hazardous condition. Factors were blowing snow and night conditions.

On December 20, 2003, about 2150 eastern standard time, a Bell 407, N508MT, was substantially damaged while landing in a field near Morehead, Kentucky. The certificated commercial pilot and two crewmembers were not injured. Night visual meteorological conditions prevailed for the flight that departed Saint Clair Hospital, Morehead, Kentucky. A company VFR flight plan was filed for the positioning flight conducted under 14 CFR Part 91.

The pilot reported that that he was dispatched to a medical evacuation approximately 8 miles east of the hospital. The helicopter arrived over the landing zone, and the pilot performed a "high recon" to locate obstacles and determine the best way to land. The pilot then completed a "low recon" to confirm obstacles, briefed the crewmembers, and initiated an approach. However, the pilot performed a go-around due to blowing snow. 

The pilot made another "low recon" and re-briefed the crewmembers before initiating a second approach. During the second approach, the tail rotor struck a standing frost free hydrant. The hydrant was approximately 1 inch in diameter and 3 feet high. The helicopter subsequently spun right and the pilot performed a hovering autorotation to the ground. 

The pilot further stated that ground personnel had marked the perimeter of the landing zone with lights. However, the ground personnel later stated that they had not walked the interior of the landing zone and were unaware of the obstacle. 

Examination of the helicopter by a Federal Aviation Administration (FAA) inspector revealed damage to the tail rotor, tail rotor gearbox, and tail boom. 

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