Definition
The fixed schedule on which aeronautical charts, instrument procedures, and related navigation publications are reviewed, updated, and reissued. In the United States, civil instrument procedures and most aeronautical charts follow a 56-day revision cycle, with new editions taking effect on published effective dates so that pilots are always operating from current data.
Plain English
It's the regular, repeating schedule on which charts and instrument procedures get updated and republished. Every cycle, a new edition comes out and the old one expires.
Context Anchor
Seen when checking instrument procedure charts, chart dates, and updates to published flight information.
Derivation
Revision comes from the Latin revisere, 'to look at again.' Cycle comes from the Greek kyklos, 'circle' or 'wheel.' Together the term describes the recurring loop of reviewing and reissuing aeronautical information on a set timetable.
Why Pilots Care
Pilots must ensure they are using current procedures; flying with outdated revisions can result in unsafe navigation or regulatory non-compliance.
Analogy
It is like a regularly updated map app. If you use an old version, the road may have changed even though the map still looks official.
Intuition Check
Do not read revision cycle as just “someone edited it.” In this context, it means a planned update period with dates that determine whether the procedure or chart is current.
Example Sentence 1
Before the flight, she checked that her approach plates were within the current revision cycle and had not expired.
Example Sentence 2
Changes to runway lighting were incorporated during the next revision cycle of the procedure.