Trajectory-Based Operations (TBO) - Joint Planning and ...

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Trajectory-Based Operations (TBO) Study Team Report point, at approach metering point, at runway threshold, etc.), but most FMSs are only able to execute one RTA a time, updating to the next after passing the previous. As TOD nears, AOC uplinks descent wind forecasts, which fortunately do not affect the ability to hit the RTA. These winds contain corrections received from winds aloft calculations from other aircraft that improve the precision of the descent wind profiles. 14.4 Detroit to Dulles Arrival/Approach and Landing Transcon 1324 and Sunset 123 arrive at their respective arrival meter points within the CTA/RTP performance threshold. Just prior to arriving at the arrival meter point, both aircraft receive their runway assignment, arrival/approach route, sequencing, and parallel runway pairing assignments. Transcon 1324 and Sunset 123 are each transmitting their planned final approach speeds via data link. The ANSP determines that although Transcon 1324 will have a final approach speed that is 10 knots faster than Sunset 123, the speed differential is acceptable for the two aircraft to be paired together for VCSPR approaches. Transcon 1324 has a faster final approach speed, so Transcon 1324 will be positioned behind Sunset 123 at the coupling point. As shown in Figure 10, Ariba 121 and Ariba 122 will be arriving at IAD on staggered approaches ahead of Transcon 1324 and Sunset 123. Ariba 121 and Ariba 122, which are NextGen Classic equipped, are not equipped for airborne merging and spacing, and are conducting time-based approaches with the 4DT, generated by ground-based automation data linked to the aircraft. They will be conducting staggered runway operations rather than VCSPR operations. The two Ariba aircraft have arrived during a lull in traffic just before a high-density arrival push. If they had arrived during highdensity operations, they would have had to wait in a queue to land on a runway designated for handling classic-equipped aircraft. A 4DT OPD is generated for each Ariba aircraft by ground-based automation, which is then transmitted to each aircraft in the form of speed and altitude profile constraints along the arrival and approach routes. Transcon 1324 will be landing behind Ariba 121, and Sunset 123 will be landing behind Ariba 122. Joint Planning and Development Office 55
Trajectory-Based Operations (TBO) Study Team Report Figure 10: IAD Arrivals As Sunset 123 approaches the arrival meter point, the ANSP assigns airborne merging and spacing responsibility behind Ariba 122. Transcon 1324 is assigned responsibility for airborne merging and spacing with respect to Sunset 123 to arrive with appropriate spacing at the initial coupling point for the VCSPR operation. Joint Planning and Development Office 56
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