Accident Details
A twin-engine airplane conducting a local post-maintenance test flight with two pilots on board crashed shortly after takeoff. During the initial climb, the aircraft rolled to the right and became uncontrollable, subsequently impacting the ground. Both occupants were killed.
Investigation Findings
The official investigation determined the probable cause to be an uncontrolled collision with the ground during initial climb due to inadequate maintenance and inspection. Several contributing factors were identified:
- The pilot-in-command failed to maintain flying speed.
- Engine structure issues were noted, including an unapproved modification to a cylinder assembly, wrong parts in the piston and piston rings, and valve assemblies that were leaking and over torqued.
- Unfavorable wind conditions with gusts up to 40 knots were present.
- A witness reported seeing smoke emanating from the engine prior to the crash.
Conclusion
The accident resulted from a combination of maintenance deficiencies and operational factors, leading to loss of control in flight. The investigation did not specify further details about the aircraft type, registration, or other circumstances beyond those reported.