ASN Wikibase Occurrence # 201102
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| Date: | Wednesday 8 November 2017 |
| Time: | 11:40 LT |
| Type: |  Bell 206L-3 LongRanger III |
| Owner/operator: | Air Evac Ems Inc |
| Registration: | N275AE |
| MSN: | 51186 |
| Year of manufacture: | 1986 |
| Total airframe hrs: | 13103 hours |
| Engine model: | Rolls Royce M250-C30P |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Obion County, Union City, TN -
 United States of America
|
| Phase: | En route |
| Nature: | Ambulance |
| Departure airport: | Troy, TN |
| Union City, TN (Lawn) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot, flight nurse, and flight paramedic were conducting a flight for a public relations event. None of the three crewmembers had previously landed at this landing zone (LZ). A company flight nurse was on the ground at the LZ informing the flight crew of obstacles in the area.
The pilot conducted a low reconnaissance and initiated a steep approach into the LZ. All obstacles were observed and called out by crewmembers as they continued the approach. The terrain appeared to the crew to be flat in all directions. The pilot began to set the helicopter on the ground from a stabilized hover. As the pilot lowered the collective to set the skids on the ground, the skid toes and the forward half of the skids made ground contact; however, from just aft of the pilot's seat, the terrain sloped downward at a 10°-to-15° angle. Once the collective was lowered to the bottom stop, the helicopter rocked backwards to a tail-low attitude.
The pilot and crew felt the tail stinger make ground contact and assumed that the tail rotor had impacted the ground. The pilot then applied upward collective and forward cyclic, which forced the front of the skid toes tightly against the terrain. The application of upward collective resulted in the helicopter entering an incipient dynamic rollover, aggressively rolling to a 45°-to-60° nose-low attitude. The pilot applied aft cyclic to counter the nose low attitude, and mast bumping occurred when the droop (static) stops came in to contact with the mast. The main rotor then separated from the mast and departed the helicopter. The circumstances of the accident are consistent with the pilot's attempted recovery following a slope landing, which resulted in incipient dynamic rollover, mast bumping, and separation of the main rotor.
Probable Cause: The pilot's inadvertent slope landing and attempted recovery, which resulted in an incipient dynamic rollover, mast bumping, and separation of the main rotor.
Accident investigation:
 |
|
Sources:
NTSB ERA18LA020
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=275AE
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Nov-2017 23:56 | Geno | Added |
| 09-Nov-2017 05:26 | Iceman 29 | Updated [Embed code] |
| 09-Nov-2017 05:36 | Iceman 29 | Updated [Time, Source, Embed code] |
| 09-Nov-2017 08:35 | Aerossurance | Updated [Phase, Source, Embed code, Narrative] |
| 09-Nov-2017 08:57 | Aerossurance | Updated [Nature, Departure airport, Destination airport, Narrative] |
| 02-Jul-2022 18:36 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Embed code, Narrative, Category, Accident report] |
| 07-Aug-2023 14:02 | harro | Updated [[Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Embed code, Narrative, Category, Accident report]] |
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