Definition
The date on which a published instrument approach chart, procedure, or other aeronautical information becomes officially valid for use. Charts published in advance of this date are not authorized for navigation until the effective date arrives, and the previous edition remains current up until that moment.
Plain English
The day a new chart or procedure officially starts being the one you must use. Before that day, you fly with the old version. On that day and after, you fly with the new one.
Context Anchor
Seen in approach chart briefing information, chart updates, and published procedure changes.
Derivation
From Latin 'effectus,' meaning 'brought about' or 'put into action.' The effective date is the date the chart is put into action — the moment it goes from being printed information to being legally usable.
Why Pilots Care
Ensures pilots use current, compliant procedures and avoid outdated navigation information that could lead to errors.
Intuition Check
Do not read effective date as the date the chart was printed or the date it expires. It means the date that version starts being valid for use.
Example Sentence 1
Before the flight, she checked the effective date on the approach chart to confirm it was the current edition.
Example Sentence 2
The new ILS approach has an effective date of the 15th, so it replaces the previous version starting then.