On March 15, 2007, a Robinson R-44-II (registration N196DM) was involved in an aviation accident near Miami, FL. Investigators recorded the probable cause as: The pilot's failure to maintain sufficient rotor rpm during an autorotative landing, which resulted in a hard landing and separation of the tailboom. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter pilot experienced a low rotor RPM warning and vibration, then engine and rotor RPM exceeded the red zone. After closing the throttle, the pilot performed an autorotative landing to an uneven field, during which the tailboom separated. Post-accident examination found no anomalies.
Event Details
According to the pilot's statement, while maneuvering, the low rotor RPM warning illuminated. The pilot responded by lowering the collective to increase rotor RPM and maintain altitude. Shortly thereafter, a "huge vibration" was felt, and no warnings were present on the instrument panel. The vibration worsened. The pilot then noticed that both engine and rotor RPM were significantly above the red zone. The pilot immediately closed the throttle, and the RPM began to decrease. The pilot then selected a field and performed an autorotative landing to an uneven field. During this landing, the tailboom separated from the helicopter.
Investigation
A post-accident examination of the helicopter and its systems was conducted. No anomalies were discovered. The engine was subjected to a test run, and no evidence of pre-crash anomalies was observed.
Frequently asked questions
What happened in the 15 Mar 2007 Robinson R-44-II accident near Miami, FL?
A helicopter pilot experienced a low rotor RPM warning and vibration, then engine and rotor RPM exceeded the red zone. After closing the throttle, the pilot performed an autorotative landing to an uneven field, during which the tailboom separated. Post-accident examination found no anomalies.
What aircraft was involved and where did it happen?
The accident on 15 Mar 2007 involved a Robinson R-44-II, registration N196DM, at Miami, FL.
What was the probable cause of the accident?
The pilot's failure to maintain sufficient rotor rpm during an autorotative landing, which resulted in a hard landing and separation of the tailboom.
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