Accident Bell 407 N214AM, Thursday 4 January 2018
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Date:Thursday 4 January 2018
Time:19:00 LT
Type:Silhouette image of generic B407 model; specific model in this crash may look slightly different    
Bell 407
Owner/operator:Air Methods Corp
Registration: N214AM
MSN: 54485
Year of manufacture:2014
Engine model:Rolls Royce 250-C47B
Fatalities:Fatalities: 0 / Occupants: 3
Other fatalities:0
Aircraft damage: Substantial
Location:Norfolk, Nebraska -   United States of America
Phase: Standing
Departure airport:Omaha, NE
Destination airport:Norfolk, NE
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The pilot and two medical crewmembers were on a return flight to a hospital helipad. During the approach to the helipad, the crew heard a noise outside the helicopter. The medical crewmembers reported they felt a slight "shudder" on the helicopter but attributed it to the wind as they approached the helipad. The pilot heard the noise, but there was no effect on the controls or flight characteristics, so he continued the landing without further incident. After engine shutdown, the oncoming pilot noticed that the helicopter's tail rotor drive shaft cover was missing. The surrounding area near the helicopter's approach path was searched, and the missing cover was found.

An examination of the helicopter noted substantial damage to the tail rotor drive shaft.

The day before the accident, scheduled maintenance was performed on the helicopter's tail rotor pitch change mechanism, which required removal of the drive shaft cover. The cover was reinstalled, and no problems were reported during a subsequent preflight inspection.

It is likely that maintenance personnel did not properly secure the cover fasteners after the cover was reinstalled.

Probable Cause: Maintenance personnel's failure to properly secure the tail rotor drive shaft cover, which resulted in the cover departing the helicopter in flight.

Accident investigation:
Investigating agency: NTSB
Report number: CEN18CA072
Status: Investigation completed
Duration: 1 month
Download report: Final report




Revision history:

15-Oct-2022 12:48 ASN Update Bot Added

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