NTSB Identification: DFW08LA052
14 CFR Part 91: General Aviation
Accident occurred Saturday, December 29, 2007 in Crowley, TX
Probable Cause Approval Date: 12/03/2008
Aircraft: ALTHOUSE RAF 2000 GTX, registration: N136DG
Injuries: 2 Fatal.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The amateur built gyrocopter was destroyed following a loss of rotor rpm and subsequent collision with terrain while maneuvering. A witness initially heard a "loud pop" and then observed the gyrocopter, approximately 50-feet above the ground, descending at a nose down angle of approximately 60-degrees. The gyrocopter impacted the ground approximately 100-feet from where the witness was located. The witness further reported that before the impact, the rotor blades appeared to be spinning "slowly." Inspection of the wreckage revealed that the rotor blades had struck the rudder twice. In addition, the rotor hub and rotor blades exhibited evidence of upward coning, consistent with the rotor blades having lost rigidity due to low rpm. Inspection of the wreckage did not reveal any mechanical failure/malfunction which would have resulted in the loss of control.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The pilot's failure to maintain rotor rpm while maneuvering, which resulted in a loss of rotor blade rigidity.

Full narrative available

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