Glossary
Glossary
Browse the glossary using this index
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D.C. Direct current. | |
DASee decision altitude. | |
Dark adaptation Physical and chemical adjustments of the eye that make vision possible in relative darkness. | |
Dead reckoning Navigation of an airplane solely by means of computations based on airspeed, course, heading, wind direction and speed, groundspeed, and elapsed time. | |
Deceleration error A magnetic compass error that occurs when the aircraft decelerates while flying on an easterly or westerly heading, causing the compass card to rotate toward South. | |
Decision altitude (DA) A specified altitude in the precision approach, charted in feet MSL, at which a missed approach must be initiated if the required visual reference to continue the approach has not been established. | |
Decision height (DH)A specified altitude in the precision approach, charted in height above threshold elevation, at which a decision must be made either to continue the approach or to execute a missed approach. | |
DeiceThe act of removing ice accumulation from an aircraft structure. | |
DeltaA Greek letter expressed by the symbol Δ to indicate a change of values. As an example, ∆CG indicates a change (or movement) of the CG. | |