| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | SE | Flight information service (FIS) | | | XX | miscellaneous plain language | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 050 | 5000 feet QNE | | | / | | | Centre Latitude | 5052N | 50° 52' North' | | Centre Longitude | 00046W | 0° 46' West | | Radius of area affected | 011 | 11 nautical miles |
| | TEST TRAFFIC INFORMATION SERVICE-BROADCAST ( TIS-B ) TRANS WILL TAKE PLACE WITHIN 10NM RADIUS 505134N 0004533W ( EGHR ). AIRCRAFT INDICATIONS MAY OCCUR SURFACE TO 5000FT ABOVE MEAN SEA LEVEL.BRIEFING SHEET 031 / 2025 REFERS,FURTHER DETAILS WWW.NATS.AERO / AIS.FOR INFO CONTACT EMAIL CONTACT ( AT ) TIS-B-RESEARCH.CO.UK.AR-2025-2650 / 02. |
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