WHAT VERSION 3 ADDS TO THE STORY
The official Fenix V3 presentation spends time on connections that are easy to miss when you first enter the cockpit. Cabin electronics pass information between systems; engine-control computers make their own decisions; the flight-management system constructs a descent. The names can sound forbidding, but the questions are approachable. Has the cabin actually finished its work? Has the engine reached the next stage of its start? Why is the aircraft planning a level segment before continuing down? [11, Chapters CIDS and FAP] [11, Chapter FADEC] [11, Chapter LNAV/VNAV]
You will meet the abbreviations in context. CIDS, the Cabin Intercommunication Data System, connects cabin functions and information. The FAP is the Flight Attendant Panel used for supported cabin indications and controls. FADEC means Full Authority Digital Engine Control: the engine's electronic control system. LNAV and VNAV refer to lateral and vertical navigation. For now, the useful idea is that these systems exchange information. Closing a door, arming its escape slide and confirming Cabin Ready are different events; one label cannot stand in for the whole cabin sequence.
We will follow those events beside the controls and displays you actually use. During an engine start, for example, rotation, combustion and a stable running condition arrive in sequence. During descent, a planned level section can have a purpose rather than signal that the aircraft has forgotten Heathrow. The detailed chapters will help you investigate what you see. Dated build notes remain dated, because software behaviour can change while the underlying aircraft principle stays the same.