Aviation glossary · Maintenance and productionWhat is LDND?
Last Done / Next Due
The pair of values that controls a recurring maintenance task: when it was last accomplished and when it next falls due, in hours, cycles or calendar time.
Why it matters
Every recurring task in a programme is governed by this pair. One wrong last-done value moves every future occurrence of that task.
In AerSynx
Recurring tasks are scheduled from the maintained record, and a correction to a last-done value flows forward instead of being patched task by task. LDND and MPD Management →