READING F-PLN A/B AND THE PSEUDO-WAYPOINT MODEL
F-PLN is both a route and a prediction display. Its rows can contain database fixes, procedure legs, pilot-defined points and computed pseudo-waypoints such as T/C, T/D or DECEL. These are not all interchangeable objects. The fact that a row occupies a line beside an LSK does not mean it is an ordinary named fix available for every revision function. [66, PDF pp. 305-311,447,648-656]
1. Re-centre on the active relationship. Press F-PLN and identify FROM and TO before scrolling elsewhere. Check whether the page is ACTIVE, TMPY or SEC. FROM-to-TO describes the present active leg relationship, not merely the first two interesting names visible on the screen. When returning from a long route review, re-establish that relationship before making a time-sensitive edit. [66, PDF pp. 305-311,447,648-656]
2. Inspect the two views. Use the horizontal page change provided for F-PLN A/B. The first view emphasises times and speed/altitude information; the other provides fuel/wind-related information in the cited standard. Read the column labels after changing view. A value under EFOB is predicted remaining fuel at that point, while a fuel quantity on ECAM describes fuel actually aboard now. [66, PDF pp. 305-311,447,648-656]
3. Read predictions with their conventions. Distinguish a constraint from the altitude or speed predicted to result. Inspect an associated marker or the VERT REV page when clarification is needed. A pseudo-waypoint's position can move after wind, route, speed or mass changes because it represents a calculated event. Its movement is information about the prediction model, not automatically evidence that a database waypoint moved. [66, PDF pp. 305-311,447,648-656]
4. Use PLAN mode as a route audit. Scroll through the intended sequence with a suitable range and chart alongside. Inspect procedure joins, large turns, repeated names, discontinuities and the missed-approach/alternate portions beyond the destination. Zoom or change range to examine a connection rather than accepting a single whole-route picture as proof of every leg. [66, PDF pp. 305-311,447,648-656]
5. Choose the revision side by function. Left LSKs normally access lateral revision; right LSKs access vertical revision for the corresponding displayed fix. Not every origin, destination, FROM or pseudo-point offers every function. If a prompt is unavailable, inspect the selected object and phase before treating the absence as a fault. The receiving page defines what can actually be modified. [66, PDF pp. 305-311,447,648-656]