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.
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