What is the maximum approved passenger seating for an aircraft needing ETOPS consideration?

For an aircraft to require Extended-range Twin-engine Operational Performance Standards (ETOPS) consideration, it must have a maximum passenger seating capacity of 20 or more. ETOPS is applicable primarily to twin-engine jet aircraft, but it can also pertain to larger aircraft with specific seating limitations. The rationale behind this requirement is that aircraft with a higher number of passengers typically operate on routes that might involve longer distances over water or areas that are distant from airports suitable for emergency landings.

Aircraft with fewer than 20 seats generally operate within a different regulatory framework, typically under general aviation rules, which do not necessitate the same level of operational performance standards as those required for larger, commercial aircraft that must comply with ETOPS. Thus, the need for ETOPS is rooted in the safety considerations of carrying more passengers over extended routes, mandating careful planning and preparedness for potential engine-out situations.