| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | OB | Obstacle | | | CE | erected | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | M | Miscellaneous | | | / | | | Scope | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 004 | 400 feet QNE | | | / | | | Centre Latitude | 5133N | 51° 33' North' | | Centre Longitude | 00007W | 0° 7' West | | Radius of area affected | 001 | 1 nautical miles |
| | LIT CRANE AT POSITION 513236N 0000728W ( ISLINGTON,LONDON ) IN THAMES VALLEY AVOIDANCE DAY AND NIGHT HEIGHT 338FT ABOVE MEAN SEA LEVEL ( 220FT ABOVE GROUND LEVEL ). 25 / 03 / 138 / LFC |
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