Using Amend

Reading an airport page

An airport page lists what changes between the cycle in effect and the next one, or, once the new cycle is in effect, what just changed. Each change has:

• A label: ACT, IFR or FYI (below).
• A summary in plain English, like a tower that now closes an hour earlier.
• The values before and after, as the FAA wrote them.
• The FAA source it came from, so you can check the original.

Below that are the airport's earlier cycles, back to Aug 2024, so you can see what changed since you last flew there. The guide walks through real examples.

ACT, IFR and FYI

Each change gets one label:

• ACT: changes how you fly there. Tower and Class D hours, frequencies, runways opened, closed or renumbered, lighting, pattern altitude, attendance, navaids removed, an approach removed with nothing in its place, airspace, and remarks about closures, PPR or services that aren't available.
• IFR: instrument procedures. Approaches, STARs and departures added, amended or replaced, and navaid and ILS details.
• FYI: everything else worth knowing, like a new phone number, a reworded remark or an obstacle that moved a little.

The guide shows how to read a change, with examples.

Remarks in plain English

FAA remarks are written in contractions (RWY 18 CLSD TO ACFT OVR 12500 LBS). Amend translates them with an AI model, and every translation is checked before it's shown:

• Only the FAA's own meanings. Every meaning comes word for word from the FAA's own lists: the Chart Supplement's abbreviations and FAA Order JO 7340.2, Contractions. A contraction the FAA doesn't define stays exactly as written.
• No guessing. A translation that changes or adds anything the remark doesn't say is thrown out.
• The FAA text wins. When a translation doesn't pass, the FAA's own text is shown instead. The original is always one tap away, translated or not.

That means some remarks show as FAA text. Over 90% of the changed remarks on airport pages read in plain English. The status page has the count for the latest build.

Seeing changes ahead of time

The FAA posts each cycle before it takes effect. Once it's posted, Amend shows the changes as coming up, with the value in effect today first and the new one after it, and a countdown to the switch.

At 0901Z on cycle day, every page switches to in effect on its own, even if it's already open. They use a clock checked against the server's, in case your device's clock is off.

Lists

A list is a set of airports you want to follow: your home field, a training area, a trip. You can keep several, each with up to 200 airports.

• Add an airport from its page. The home page shows what's coming up at the airports on your lists, and which list each one is on.
• Share a list with its link. Whoever opens it sees the same airports and can save a copy to their own lists.
• Named lists have a fixed address (https://amend.watch/list/<name>/) for a school or club.

Your own lists are stored in your browser only. Clearing site data removes them, and they don't move between devices, so share the link to yourself to copy one.

The cycle calendar

cycles.ics adds every changeover at 0901Z to your calendar, so you know when to check your airports.