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Old 16th Dec 2015, 10:26
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Shandy52
 
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VD/MD

I'm reasonably familiar with most terminology covering airspeed and Mach number (e.g. Vmo/Mmo) but hadn't come across VD/MD prior to following the R&N Air Asia Indonesia thread. Could someone explain the meaning of the "D" here, please? Disaster? Destruction?
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