| Acronym |
Definition |
| DACS |
Danger Area Crossing Service. |
| DAAIS |
Danger Area Activity Information Service. |
| D & D |
Distress & Diversion Cells at Air Traffic Control Centres. |
| Deadstick |
Descent and landing with engine(s) shut down and propeller(s) stopped. |
| DCT |
Direct |
| DECCA |
Hyperbolic area navigation system. |
| Density Altitude |
Pressure Altitude corrected for air temperature. |
| DETRESFA |
Distress Phase of Search-and-Rescue Operation. |
| DF |
Direction Finding. |
| DH |
Decision Height. |
| DI |
Direction Indicator. |
| DME |
Distance Measuring Equipment. |
| DOPPLER |
Doppler Effect is the change in frequency of light, radio or sound waves when source and receiver are in relative motion. |
| DoT |
Department of Transport. |
| DP |
dew point |
| DR |
Dead (deduced) Reckoning. Plotting position by calculating the effect of speed, course, time and wind against last known position. |
| DRY |
When referring to aircraft hire charges this means 'without fuel'. |
| DZ |
Dropping Zone (i.e. parachuting) |
