D-value definition
D-value means a limiting dimension, in terms of “D”, for a heliport, helideck or shipboard heliport, or for a defined area within;
D-value means the largest overall dimension of a helicopter when rotors are turning. This dimension will normally be measured from the most forward position of the main rotor tip path plane to the most rearward position of the tail rotor tip path plane (or the most rearward extension of the fuselage in the case of Fenestron or Notar tails);
D-value means the Decimal Reduction Time, i.e. the time in minutes for the population of micro-organisms to be reduced by one log (i.e. 90%) at a specified temperature (Tx);
More Definitions of D-value
D-value means the largest overall dimension of a helicopter when rotors are