| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | FP | Heliport | | | 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 | A | Aerodrome information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 999 | Unlimited | | | / | | | Centre Latitude | 5222N | 52° 22' North' | | Centre Longitude | 00029E | 0° 29' East | | Radius of area affected | 005 | 5 nautical miles |
| | HELICOPTER LANDING ZONE FOSS ACTIVATED FOR ROTARY WING / TILT-ROTOR OPERATIONS.NON-PARTICIPATING AIRCRAFT MAY NOT UTILIZE TAXIWAY ALPHA BTN HAMMERHEAD AND AIR MOBILITY COMMAND RAMP. |
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