Which ADS systems are compliant with RVSM?

The correct answer identifies that ADS1, ADS2, and ADS3 are all compliant with Reduced Vertical Separation Minimum (RVSM) regulations. RVSM is an important set of requirements that enables aircraft to operate in certain airspace with reduced vertical separation between flight levels, specifically maintaining a minimum vertical separation of 1,000 feet between aircraft operating in the same airspace between FL290 and FL410.

ADS systems, or Air Data Systems, play a crucial role in providing accurate altitude information which is essential for RVSM compliance. Each combination of the ADS systems mentioned contributes to maintaining the performance and accuracy standards required for RVSM operations. Therefore, the inclusion of all three systems indicates comprehensive compliance across various operational scenarios.

In contrast, the alternative choices limit the number of systems to only one or two, which does not reflect the complete combination of compliant systems necessary for RVSM operations. By selecting the full range of ADS systems as compliant, this answer reflects the broader regulatory requirements that ensure safety and efficiency in the airspace.