What is the weight threshold for an aircraft to be fitted with a Flight Data Recorder (FDR)?

The correct threshold for requiring a Flight Data Recorder (FDR) to be fitted on an aircraft is indeed 5,700 kg. This requirement is established by international aviation regulations, specifically those outlined by the International Civil Aviation Organization (ICAO) and often enforced by national aviation authorities.

Aircraft that exceed this weight limit are mandated to carry FDRs to improve safety and accident investigation capabilities. The FDR captures crucial flight data, including parameters such as speed, altitude, and heading, which can be vital for understanding the circumstances surrounding any flight anomalies or accidents.

By having a defined weight threshold, regulators ensure that only aircraft that are capable of operating within more complex and potentially hazardous environments are equipped with these essential data recording devices. This regulation aims to promote safety and enable investigations into aviation incidents, ultimately leading to informed improvements in air travel safety.

Other weights mentioned in the choices have no legal basis or requirement for FDR installation as per the current regulatory framework, making 5,700 kg the correct answer in this context.