MCVL  Manual Configuration Variation List 
MCW  Modulated Continuous Wave 
MD  Main Deck 
MDA  Minimum Decision Altitude 
MDA  Minimum Descent Altitude 
MDAU  Modular Data Acquisition Unit 
MDCC  Main Deck Cargo Compartment 
MDCD  Main Deck Cargo Door 
MDDU  Multipurpose Disk Drive Unit 
MDF  Medium Frequency Direction Finding Station 
MDH  Minimum Descent Height 
MDL  Module 
MDM  Material Data Meeting 
MDU  Multiplier Divider Unit 
MDU  Manual Drive Unit 
MEA  Minimum En Route IFR Altitude