| 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 | A | Aerodrome information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 999 | Unlimited | | | / | | | Centre Latitude | 5005N | 50° 5' North' | | Centre Longitude | 00515W | 5° 15' West | | Radius of area affected | 005 | 5 nautical miles |
| | WATCHMAN RADAR OBSTRUCTION LIGHT UNSERVICEABLE |
|
