Which altitude measurement systems are necessary for RVSM compliance?

In the context of Reduced Vertical Separation Minimum (RVSM) compliance, having two independent altitude measurement systems with ice protection is essential. This dual-system approach is designed to ensure accuracy and safety in altitude readings, as RVSM operations require a separation of only 1,000 feet between aircraft flying between 29,000 and 41,000 feet.

The reason two systems are mandatory is to provide redundancy; if one system fails or provides inaccurate altitude information, the second system acts as a backup, ensuring the aircraft can still operate safely within the RVSM airspace. Additionally, ice protection is necessary to prevent the buildup of ice on the sensors, which can compromise their accuracy. Thus, the combination of two independent systems and the inclusion of ice protection make for a robust safety protocol that aligns with RVSM regulations, allowing for safe vertical separation between aircraft in the designated airspace.