On April 30, 1984, a Bell 206 (registration N3913W) was involved in an aviation accident near Boston, MA. Investigators recorded the probable cause as: The National Transportation Safety Board determines the probable cause of this accident was an unexplained partial and subsequent complete loss of engine power during climb, which could not be identified during post-accident examination and ground testing. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter experienced a partial then complete loss of power while climbing after takeoff. The pilot executed an autorotation and landed safely in a railroad switching area, though the aircraft sustained damage to its main rotor blades and tail boom.
What happened
Shortly after takeoff, the helicopter was climbing through an altitude of 200 to 300 feet above ground level at a speed of 50 to 60 knots. During this phase of flight, the aircraft experienced a partial loss of power, which was immediately followed by a complete loss of engine power. The pilot initiated an autorotation and successfully landed the helicopter in a railroad switching area. Upon landing, the main rotor blades and tail boom skids were damaged.
The investigation
A mechanical examination of the aircraft was conducted following the incident. Additionally, a ground run-up of the engine was performed to assess its operational status. These inspections revealed no apparent reason for the loss of power.
Probable cause
The National Transportation Safety Board determines the probable cause of this accident was an unexplained partial and subsequent complete loss of engine power during climb, which could not be identified during post-accident examination and ground testing.
What happened in the 30 Apr 1984 Bell 206 accident near Boston, MA?
A helicopter experienced a partial then complete loss of power while climbing after takeoff. The pilot executed an autorotation and landed safely in a railroad switching area, though the aircraft sustained damage to its main rotor blades and tail boom.
What aircraft was involved and where did it happen?
The accident on 30 Apr 1984 involved a Bell 206, registration N3913W, at Boston, MA.
What was the probable cause of the accident?
The National Transportation Safety Board determines the probable cause of this accident was an unexplained partial and subsequent complete loss of engine power during climb, which could not be identified during post-accident examination and ground testing.
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