| 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 | | | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 005 | 500 feet QNE | | | / | | | Centre Latitude | 5109N | 51° 9' North' | | Centre Longitude | 00145W | 1° 45' West | | Radius of area affected | 001 | 1 nautical miles |
| | OBSTACLE LIGHTS UNSERVICEABLE HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) MAST C486 POSITION 510924N 0014514W ( BOSCOMBE DOWN AERODROME ) 50FT ABOVE GROUND LEVEL 457FT ABOVE MEAN SEA LEVEL |
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