Fatal plane crash off Half Moon Bay not necessarily due to amateur construction: experts say engine issue more likely cause

HALF MOON BAY, Calif. – A small plane crashed off the coast of Half Moon Bay, Calif., that was classified as an “amateur-built” experimental craft by the federal government. However, experts suggest that the classification might not be the reason for its fatal plunge.

The National Transportation Safety Board reported that the Cozy Mark IV, a four-seat, single-engine plane, crashed shortly after taking off from Half Moon Bay Airport. Of the four people on board, only 27-year-old Emma Willmer-Shiles of San Francisco has been identified, with the others presumed dead.

The NTSB is currently investigating the crash and has not confirmed whether the aircraft’s construction will be a part of the probe. According to agency spokesperson Sarah Taylor Sulick, aircraft maintenance, weather, and the pilot’s background will all be considered factors in the investigation. In addition, air traffic control communications, surveillance footage, and witness statements will also be reviewed.

The small plane was considered a “home-built aircraft,” with only 83 Cozy Mark IV planes registered with the Federal Aviation Administration, all classified as experimental due to their home construction. Robert Ditchey, an expert in airplanes and aviation litigation, emphasized that the market for this type of airplane is small and that constructing an airplane requires both time and money.

Although the small planes exhibit less regulation and can be considered hazardous, Ditchey cautioned against assuming that the construction led to the fatal flight. He noted that engine issues are more likely to be the cause, pointing out that the plane was seen traveling erratically before it nosedived.

As the investigation continues, the NTSB’s preliminary report is expected to be ready in two to three weeks, while the final report, which will include the crash’s probable cause, could take up to two years to publish. This unfortunate incident serves as a reminder of the importance of thorough investigation, as well as the need to prioritize safety in aviation.