| Significance | Code | Meaning |
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| 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 | 999 | Unlimited | | | / | | | Centre Latitude | 5129N | 51° 29' North' | | Centre Longitude | 00028W | 0° 28' West | | Radius of area affected | 005 | 5 nautical miles |
| | AERODROME 2.18 AIR TRAFFIC SERVICES COMMUNICATION FACILITIES-HEATHROW TOWER-TOWER CHANNEL ( S ) UPDATED TO READ : CHANNEL 124.480 UK AERONAUTICAL INFORMATION PUBLICATION EGLL AERODROME 2.18 REFERS. |
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