Is it permissible to move a block altitude into another altitude stratum (AOA 240)?

In the context of radar operations and altitude management, moving a block altitude into another altitude stratum is not permitted. This is a critical safety regulation aimed at maintaining clear separation between different aircraft operating at various altitudes. Under standard operating procedures, each altitude stratum is defined to prevent conflicts between aircraft, especially in busy airspace. Maintaining these strata ensures optimal safety and minimizes the risk of collisions.

Allowing altitude changes could lead to potential airspace conflicts, as aircraft may not have the necessary separation required for safe operations. Therefore, adhering to the established altitude strata without exception is crucial for the integrity of air traffic control systems.