Add pilot "request to slow down" for fast arrivals (#884)#910
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When a controller holds an arrival fast as it nears the field, the pilot now asks to slow down. A per-tick check compares the assigned speed floor against a standard speed-by-distance profile (250/210/190/180 kt gates) and enqueues a request when the aircraft is too fast for its distance. The request is made once per speed-gate band, re-asking only on crossing into a closer band; a new controller speed assignment re-arms it. Distance uses remaining track miles on a lateral route, falling back to straight-line distance to the approach threshold when vectored toward it. The request is re-validated at dispatch time and dropped if the controller has since slowed the aircraft or cleared the assignment. Includes unit tests for the speed floor, distance estimate, gate profile, the per-tick request logic, and transmission generation. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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When a controller holds an arrival fast as it nears the field, the pilot now asks to slow down. A per-tick check compares the assigned speed floor against a standard speed-by-distance profile (250/210/190/180 kt gates) and enqueues a request when the aircraft is too fast for its distance.
The request is made once per speed-gate band, re-asking only on crossing into a closer band; a new controller speed assignment re-arms it. Distance uses remaining track miles on a lateral route, falling back to straight-line distance to the approach threshold when vectored toward it. The request is re-validated at dispatch time and dropped if the controller has since slowed the aircraft or cleared the assignment.
Includes unit tests for the speed floor, distance estimate, gate profile, the per-tick request logic, and transmission generation. I also tested in the sim, and it seems to work as expected.