What is the minimum distance from shore that life rafts are required for single-engine aircraft unable to maintain level flight?

The correct answer to the question regarding the minimum distance from shore for life rafts required on single-engine aircraft unable to maintain level flight is 100 nautical miles (NM). Regulations require that single-engine aircraft operating over water beyond a specified distance from shore must carry life rafts as part of safety equipment. This requirement is in place because beyond 100 NM from the nearest shore, the likelihood of a ditching scenario increases; thus, having life rafts is essential for survival in the event of an emergency landing on water.

This regulation helps to ensure that pilots and passengers have the necessary equipment to enhance their chances of survival in remote areas where assistance might take longer to arrive. The safety considerations involved in flying over significant distances from land are why the requirement specifies this distance, making proper preparation crucial for flight operations in these environments.