| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | CA | Air/ground | | | CF | operating frequency(ies) changed | | | / | | | 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 | 021 | 2100 feet QNE | | | / | | | Centre Latitude | 5412N | 54° 12' North' | | Centre Longitude | 00123W | 1° 23' West | | Radius of area affected | 002 | 2 nautical miles |
| | TOPCLIFFE AIR TRAFFIC ZONE AND GLIDER SITE-FREQUENCY 121.450MHZ ( TOPCLIFFE RADIO ) UPDATED TO CHANNEL 121.455.UK AERONAUTICAL INFORMATION PUBLICATION ENR 2.2 AND ENR 5.5 REFERS. |
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