| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | AF | Flight information region (FIR) | | | TT | trigger NOTAM | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | A | Aerodrome information | | | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 100 | 10000 feet QNE | | | / | | | Centre Latitude | 5141N | 51° 41' North' | | Centre Longitude | 00147W | 1° 47' West | | Radius of area affected | 009 | 9 nautical miles |
| | TRIGGER NOTAM-AERONAUTICAL INFORMATION PUBLICATION SUPPLEMENT 103 / 2026 WITH EFFECT FROM 17 SEP 26.TEMPORARY TRANSPONDER MANDATORY ZONE : ROYAL AIR FORCE FAIRFORD-REPLACES BFS 068 / 2026 |
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