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Getting started with Amend
Amend shows what changes in each FAA data cycle at every US airport, in plain English, before it takes effect.
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What Amend does
Every 28 days the FAA publishes a new cycle of airport, frequency, navaid, airspace and chart data. The changes that matter, like new tower hours, a decommissioned VOR, a renumbered runway or an amended approach, are buried among tens of thousands of rows that changed for bookkeeping reasons.
Amend compares every cycle with the one before for every US airport, hides the bookkeeping, and explains what's left in plain English, sorted by how much it matters when you fly there. The FAA posts each cycle before it takes effect, so Amend shows changes before they happen.
What changed and how much it matters are decided by fixed rules, the same way every cycle.
Quick start
- Find your airport search
Search on amend.watch by FAA ID (
BJC), ICAO code (KBJC), name or city. If an airport has no changes on record, Amend says so. - Read what changed airport page
Changes are sorted ACT first, then IFR, then FYI. Each one says what changed in plain English, shows the old and new values, and links the FAA source it came from.
- Keep a list lists
Add the airports you fly to a list from any airport page. Lists stay in your browser: no account, nothing sent anywhere. The home page then shows what's coming up at your airports first.
- Add the cycle dates optional
cycles.ics puts every cycle changeover in your calendar, so you know when to check your airports.
FAA cycles
The FAA's aeronautical data runs on a fixed 28-day schedule. Each cycle takes effect at 0901Z on its effective date, and the FAA posts its files ahead of time: the chart index says 20 days ahead.
- In effect
- The cycle that applies today.
- Upcoming
- The next cycle, once the FAA has posted it. Amend shows its changes against the cycle in effect, with the current value first.
- Calendar
- Every cycle date is in cycles.ics, which you can add to any calendar app.
Where to go next
Reporting problems
Found something wrong? Email hello@amend.watch with the airport, the cycle and what the FAA source says. If the FAA's own data is wrong, only the FAA can fix it: use its Aeronautical Inquiries page.