| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | OL | Obstacle lights | | | AS | unserviceable | | | / | | | 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 | 011 | 1100 feet QNE | | | / | | | Centre Latitude | 5131N | 51° 31' North' | | Centre Longitude | 00016W | 0° 16' West | | Radius of area affected | 001 | 1 nautical miles |
| | AIR NAV OBSTACLE LIGHT UNSERVICEABLE AT POSITION 513120N 0001543W ( ACTON,LONDON ). HEIGHT 603FT ABOVE GROUND LEVEL / 1100FT ABOVE MEAN SEA LEVEL.AR-2026-9246 / 04. |
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