Which alerting system is mandated for turbine-powered airplanes?

The ground proximity warning system (GPWS) is mandated for turbine-powered airplanes because it enhances safety by providing alerts to pilots regarding potential terrain collision. This system monitors the aircraft's altitude and flight path, comparing it to the terrain and alerting the crew if they are in danger of inadvertently flying into the ground. This is especially critical for turbine-powered aircraft, which often operate in various environments and at altitudes where terrain awareness is crucial for safe operation.

The system aims to prevent controlled flight into terrain (CFIT) accidents, which can occur even with experienced pilots. By providing timely alerts, GPWS allows pilots to take corrective action when necessary. This safety mandate reflects the aviation industry's focus on reducing accidents and improving overall flight safety through advanced technology.

Other systems mentioned, while beneficial to aircraft operation, do not carry the same mandated status for turbine-powered airplanes as GPWS does. For instance, flight data monitoring systems may assist in operational analysis and safety but are not required for the same safety-critical functionality that GPWS provides.