FLY-BY, OVERFLY AND SEQUENCING AT THE ACTIVE LEG
An ordinary fly-by waypoint allows the computed turn to begin before the waypoint so that the aircraft can join the next leg smoothly. An overfly requirement changes that transition: passage over the fix is part of the coded instruction. The shape of the turn therefore matters as well as the order of names. Do not impose overfly simply to make a track pass through every waypoint symbol exactly. [66, PDF pp. 80,324,329-330]
1. Identify the requirement. Check whether overfly comes from the published procedure or a deliberate cleared revision. Read any overfly marking already attached to the waypoint. A database-coded fly-over is not necessarily a mistake because the turn looks wider than an anticipated fly-by turn. Compare the path with the leg instruction and the current aircraft speed. [66, PDF pp. 80,324,329-330]
2. Apply the documented toggle when required. The guide uses OVFLY to put its symbol in the scratchpad and the corresponding waypoint's left LSK to apply it. Inspect TMPY for the suffix and changed track before insertion. The same documented sequence can remove a pilot-imposed overfly. Verify the actual resulting symbol and geometry rather than assuming a second press only copied the first action. [66, PDF pp. 80,324,329-330]
3. Read sequencing separately. Automatic movement from FROM/TO to the next leg follows the relevant leg/position logic. A turn still in progress and a changed TO row are not inherently contradictory. Observe the active path, fix passage and next leg together. Do not manually advance the flight plan solely because the map line or waypoint symbol has a geometry you did not expect. [66, PDF pp. 80,324,329-330]
4. Re-sequence only with a defined route. The source includes manual sequencing methods for appropriate situations. Establish the intended next active fix and path before using one, especially after vectors, a go-around or SEC activation. If a genuine direct clearance exists, DIR TO may be the correct operation; deleting FROM rows indiscriminately is not a substitute for choosing the intended current leg. [66, PDF pp. 80,324,329-330]
5. Check downstream effects. After an overfly or sequencing change, inspect the resulting path at a useful scale and review the first retained restrictions. Speed affects turn geometry and an overfly can consume additional distance before the following leg. Keep that consequence in the vertical/energy picture. The successful result is an understood transition and correctly sequenced active route, not just the presence or absence of a symbol. [66, PDF pp. 80,324,329-330]