Aviation glossary · Limits and countersDeadline horizon
A single forward view of everything that falls due across a fleet — directives, life limits, hard-time components, programme tasks, certificates and deferred defects.
Why it matters
Each of those lives in its own module in most systems, so the earliest due item is whichever module somebody happened to open.
In AerSynx
All of them report into one horizon, so the next thing due is not hidden inside a workspace nobody checked this week. Deadline Horizon →