The performance of modern aircraft allows pilots to climb and descend with high vertical rates. While this can provide operational benefits (i.e. fuel or time savings), it can become problematic when aircraft continue to climb/descend with a high vertical rate close to their cleared level. Learn more about ACAS Bulletin 15 on SKYbrary.
Recently, we have received a number of reports regarding incidents in which RAs (Resolution Advisory) were generated due to high vertical rates in the last 1000 feet before reaching the cleared level, against aircraft at the adjacent levels. Operationally, these RAs are unnecessary and cause distraction and additional workload to all involved. In this Bulletin we present the subject providing background information and illustrative examples of recent events.
