| Significance | Code | Meaning |
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| 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 | 009 | 900 feet QNE | | | / | | | Centre Latitude | 5131N | 51° 31' North' | | Centre Longitude | 00005W | 0° 5' West | | Radius of area affected | 001 | 1 nautical miles |
| | AIR NAV OBSTACLE LIGHT UNSERVICEABLE AT POSITION : 513058N 0000453W ( BISHOPGATE,LONDON ). OBSTACLE TYPE TOWER HEIGHT 755FT ABOVE GROUND LEVEL / 900FT ABOVE MEAN SEA LEVEL.FOR INFO 01613 790400 OR LIGHTING ( AT ) THINKDELTA.COM.AR-2026-1138 / 01. |
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