What is required for an altitude alerting system in RVSM?

An altitude alerting system in Reduced Vertical Separation Minimum (RVSM) airspace is crucial for maintaining safety by ensuring that aircraft adhere to their assigned altitudes. The correct choice states that an altitude alerting device with visual signals is required. This device plays a significant role in alerting pilots when the aircraft deviates from its assigned altitude or if there is an impending altitude loss or gain.

The presence of visual signals allows pilots to monitor altitude changes effectively at a glance, enhancing situational awareness and facilitating timely corrective actions. This requirement is part of the safety measures put in place to minimize the risk of altitude deviations, which can lead to potential collisions or loss of separation in the densely trafficked flight levels where RVSM is applicable.

The other options do not adequately fulfill the requirements set forth for an altitude alerting system in RVSM. For example, automatic altitude change notifications or indications alone without visual alerts may not provide sufficient notice to pilots to take action promptly. A manual tracking system may not be reliable or efficient enough in high-traffic environments, where the risk associated with altitude deviations is heightened. Therefore, an altitude alerting device equipped with visual signals is essential for enhancing pilot response to altitude deviations within RVSM airspace.