Surveys
| How It Works: DFW Recorded Data |
The following two movie clips are from a test conducted at DFW in June 2004, in which live data drove RELs displayed in the center tower (RELs on the airport surface were not turned on).
| Arrival - For arrivals, all RELs are simultaneously illuminated based on distance. The distance is three-quarter nautical miles from the runway threshold. When the aircraft decelerates through approximately 80 knots, RELs downfield are turned off except at the intersection the aircraft is approaching. All the RELs are turned off when the aircraft slows to taxi speed (approximately 34 knots). In this instance, EGF752 was cleared to land on 18L. The yellow diamond on the horizontal green line displayed at the approach end of the runway symbolizes the a/c on final approach. The scale is approximately 5 nm. At three-quarter nautical miles all the RELs turn on. Once the arrival lands, the RELs turn off at the far end of the runway and then at the taxiway intersections the lander approaches as it decelerates to a landing roll out and finally a taxi speed. |
Arrival.mov (QuickTime
Format) |
| Departure - (includes audio) For departures, all RELs in front of the aircraft are illuminated when an aircraft transitions from a taxi to a departure at approximately 20 knots. All RELs are turned off when the aircraft transitions from a departure to an airborne status (wheels off ground and positive rate of climb). For departure aborts, when the aircraft decelerates below 34 knots, RELs will be turned off. In this instance, EGF617 is cleared for takeoff on 18L, and all RELs turn on (red) once it reaches 20 kt on the departure roll. All RELs turn off when it is airborne (wheels up and positive rate of climb). | Departure.mov
(QuickTime Format) |
© 2004 - 2009 Lincoln Laboratory, Massachusetts Institute of Technology.