| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | OB | Obstacle | | | XX | miscellaneous plain language | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | M | Miscellaneous | | | / | | | Scope | A | Aerodrome information | | | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 005 | 500 feet QNE | | | / | | | Centre Latitude | 5130N | 51° 30' North' | | Centre Longitude | 00025W | 0° 25' West | | Radius of area affected | 001 | 1 nautical miles |
| | CRANE POSITION 513005N 0002507W ( HAYES )-AMEND EXISTING ID FROM 20250605183 TO 2026060428.UK AERONAUTICAL INFORMATION PUBLICATION AERODROME 2.10 AND EGLL OBSTACLE DATASET. |
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