NOTAM system
What Is an FDC NOTAM?
An FDC NOTAM is a regulatory notice issued by the FAA’s Flight Data Center. Where a NOTAM (D) reports a physical condition such as a closed taxiway, an FDC NOTAM changes something in the published record — a temporary flight restriction, an amended instrument approach procedure, or charted data that cannot wait for the next chart cycle. This page explains what FDC stands for, what these notices cover, and how one reads line by line.
Awareness and training aid only. Always verify with official NOTAM briefings, current charts, approved EFBs, ATC, dispatch, and company procedures before any real operation.
What does FDC stand for in a NOTAM?
FDC stands for Flight Data Center — the FAA office in Washington, DC that issues the notice. An FDC NOTAM is therefore a NOTAM published by the FAA Flight Data Center, and unlike most other notices it is regulatory: it changes something in the published or charted record rather than reporting a physical condition at an airport.
That single word — regulatory — is the whole distinction. A closed taxiway is a fact about the pavement. An amended approach minimum is a change to what you are permitted to do. The first is a NOTAM (D); the second is an FDC NOTAM.
What is an FDC NOTAM used for?
FDC NOTAMs carry the changes that cannot wait for the next chart cycle. In a normal briefing they cover:
| Category | What it changes | Typical example |
|---|---|---|
| Temporary flight restrictions | Airspace you may not enter, or may enter only under stated conditions | A TFR over a stadium, a wildfire, or a VIP movement |
| Instrument approach procedures | Minimums, missing components, revised missed-approach instructions | An ILS glideslope out of service, raising the procedure to a localizer-only minimum |
| Charted data | Anything printed on an approach plate, SID, STAR or en-route chart that is now wrong | A changed crossing restriction or a corrected frequency |
| Airspace and route changes | Published airways, fixes and special-use airspace | An airway segment unusable because a navaid is out |
| Special notices | National or regional instructions to pilots | Security-related flight procedures |
Because they carry procedural detail, FDC NOTAMs are usually written in fuller sentences than surface notices. They are the type most likely to affect a flight without touching the airport surface at all — which is exactly why they are easy to skim past when the package is long.
FDC NOTAM vs NOTAM (D): the difference that matters
These are the two types a pilot meets most often, and they answer different questions.
| NOTAM (D) | FDC NOTAM | |
|---|---|---|
| Issued by | The airport or facility, distributed through the NOTAM system | The FAA Flight Data Center |
| Nature | Informational — describes a condition | Regulatory — changes what is permitted or published |
| Typical content | Closed runways and taxiways, lighting, obstacles, navaids, apron works | TFRs, approach procedure amendments, charted data corrections |
| Style | Short and heavily contracted | Longer, closer to plain sentences |
| Shows on an airport diagram? | Often — a closure is a shape on the ground | Rarely — there is nothing physical to draw |
A single briefing package normally contains both. TaxiwayClosed AI reads the package and marks the NOTAM (D) surface closures with a cross on the airport diagram; FDC notices still need reading, and the app does not replace that. See data sources and limitations for exactly what is and is not covered.
An FDC NOTAM decoded
An FDC NOTAM amending an instrument approach procedure at San Francisco (KSFO) reads roughly like this:
!FDC 6/1428 SFO IAP SAN FRANCISCO INTL, San Francisco, CA. ILS OR LOC RWY 28R, AMDT 4A... GLIDE SLOPE UNUSABLE. LOC ONLY MINIMUMS APPLY. 2609010800-2609152359EST
Reading it in order:
!FDC 6/1428— the FDC series and the notice number.SFO— the affected location.IAP— the subject is an instrument approach procedure.ILS OR LOC RWY 28R, AMDT 4A— the exact procedure and amendment being changed. If your plate does not match this amendment number, the notice may not apply as written.GLIDE SLOPE UNUSABLE. LOC ONLY MINIMUMS APPLY.— the operational change. The vertical guidance is gone; fly the localizer-only line on the plate.2609010800-2609152359EST— the effective window, in year-month-day-hour-minute.ESThere means estimated end time, not Eastern Standard Time — a genuine trap for new readers.
Notice what is not here: no taxiway, no pavement, nothing to draw on a map. This notice changes the minimums you may use. That is what makes it regulatory. For the shorthand used across all notice types, see NOTAM abbreviations.
Where to find FDC NOTAMs in a briefing
FDC notices appear in the same package as everything else, usually grouped under their own heading or by the !FDC prefix. A workable habit:
- Read the FDC notices for every approach you might actually fly — including the ones at your alternate, which is where they are most often missed.
- Match the amendment number on the notice to the amendment number printed on your plate before acting on it.
- Treat TFRs as a separate check, not as one line in a long list. They are the FDC content most likely to end a flight badly.
- Re-check close to departure. FDC notices are issued and cancelled continuously, and a package pulled the night before can be stale.
For the full set of categories see types of NOTAMs, and for a step-by-step walk through a package see how to read a NOTAM.
Frequently asked questions about fdc notams
What does FDC stand for in a NOTAM?
FDC stands for Flight Data Center, the FAA office that issues the notice. An FDC NOTAM is regulatory: it changes published, charted or procedural information rather than reporting a physical condition at an airport.
What is an FDC NOTAM?
An FDC NOTAM is a regulatory notice issued by the FAA Flight Data Center. It covers temporary flight restrictions, amendments to instrument approach procedures, and changes to charted data that cannot wait for the next chart cycle.
What is the difference between an FDC NOTAM and a NOTAM (D)?
A NOTAM (D) describes a physical condition at an airport, such as a closed taxiway or unserviceable lighting. An FDC NOTAM changes something in the published or charted record, such as an approach minimum or a temporary flight restriction, and is regulatory in nature.
Are FDC NOTAMs regulatory?
Yes. FDC NOTAMs are regulatory in nature, which is what separates them from the informational notices that report airport and facility conditions.
Do FDC NOTAMs cover closed runways and taxiways?
Generally no. Surface closures are normally issued as NOTAM (D) notices. FDC NOTAMs deal with procedures, charted data and airspace restrictions rather than the condition of the pavement.
How long does an FDC NOTAM stay in effect?
Each FDC NOTAM carries its own effective window at the end of the notice. Some are cancelled early and others are extended, so the package must be re-checked close to departure rather than relied on from an earlier briefing.
Always verify with official sources
TaxiwayClosed AI is an awareness and training aid — it is not an official briefing and is never a substitute for one. Before any real flight, pull the current package from official sources such as FAA NOTAM Search, review the procedures in the FAA JO 7930.2 NOTAM order and in SKYbrary, use your approved EFB briefing, and confirm anything unclear with ATC, dispatch, or your CFI.
How this page is written and reviewed
Last reviewed . Written and maintained by the ETWINTECH LTD team that builds TaxiwayClosed AI. Definitions and procedures on this page are checked against FAA publications and SKYbrary; where they differ from anything here, the official source governs. ETWINTECH LTD is not an aviation authority and this page is not official guidance — see our data sources and limitations and safety advice. Spotted an error? Email contact@etwintech.com.
Read the whole package, not just the FDC notices
Download TaxiwayClosed AI, load a real NOTAM package, and let the AI pull the surface closures out and mark each one with a cross on the airport diagram — so you can spend your reading time on the notices that need it.
Awareness and training aid only. Always verify with official NOTAM briefings, current charts, approved EFBs, ATC, dispatch, and company procedures before any real operation.