AMC1 SERA.8020(b) Adherence to current flight plan

• ED Decision 2024/007/R found in: SERA (923/2012) Standardised European Rules of the Air (Dec 2024)

AMC1 SERA.8020(b) Adherence to current flight plan ED Decision 2024/007/R **ADHERENCE TO THE TRUE MACH NUMBER** (a) Aircraft subject to the Mach number technique should adhere to the true Mach number approved by ATC and should request ATC approval before making any changes thereto. If it is essential to make an immediate temporary change in the Mach number (e.g. due to turbulence), ATC should be notified as soon as possible that such a change has been made. (b) If it is not feasible, due to aircraft performance, to maintain the last assigned Mach number during en-route climbs and descents, pilots of the aircraft concerned should advise ATC at the time of the climb/descent request. *[applicable from 1 May 2025 – ED Decision 2024/007/R]* ##### AMC1 SERA.8020(b) Adherence to current flight plan *ED Decision 2024/007/R* **ADHERENCE TO THE TRUE MACH NUMBER** (a) Aircraft subject to the Mach number technique should adhere to the true Mach number approved by ATC and should request ATC approval before making any changes thereto. If it is essential to make an immediate temporary change in the Mach number (e.g. due to turbulence), ATC should be notified as soon as possible that such a change has been made. (b) If it is not feasible, due to aircraft performance, to maintain the last assigned Mach number during en-route climbs and descents, pilots of the aircraft concerned should advise ATC at the time of the climb/descent request.