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)
Arrival Movie - QuickTime Format
Arrival.avi
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)
Depature Movie - QuickTime Format
Departure.avi

 

DFW Recorded Data for THLs and RELs
For departures, THLs illuminate whenever there is a target in position on the runway and another target is simultaneously "on" the runway; such as holding on the runway for an intersection departure (that is 2500 feet or less in separation) or crossing the runway and going past the taxi position hold line at any intersection ahead of the target in position. The THLs are turned off once when any such conditions is no longer met. In this instance, first EGF263 is cleared for takeoff by ATC and begins to depart without any conflicting target ahead of it on the runway; therefore, the THLs do not illuminate. Next, EGF205 is cleared and taxis into position for an intersection departure, and the intersection THLs illuminate red in front of it for a brief time during which the separation between the two departures is less than 2500 feet on the runway. The full-length departure, AAL 1223, is cleared and proceeds to taxi into position and hold, and the full-length THLs illuminate red in front of it for a brief time during which the separation between the two departures is less than 2500 feet on the runway. Then AAL1644 is cleared to cross by ATC and proceeds "on" the runway, having started to taxi across ahead of the holding departures, thereby illuminating the intersection THLs red in front of EGF205. Once the crossing aircraft is clear, then the intersection THLs are turned off. EGF205 is cleared for the intersection takeoff by ATC and departs. Once it is safely separated away from the target holding in position for a full-length departure, then the full-length THLs are turned off. Finally, AAL 1223 is cleared for takeoff by ATC and departs.
DFW Recorded Data for THLs and RELs
THL_DFW_Departure.mov
(QuickTime Format)