| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | ND | Distance measuring equipment (DME) | | | AS | unserviceable | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 999 | Unlimited | | | / | | | Centre Latitude | 5052N | 50° 52' North' | | Centre Longitude | 00314W | 3° 14' West | | Radius of area affected | 025 | 25 nautical miles |
| | DISTANCE MEASURING EQUIPMENT DFO / MADFORD 110.850MHZ CH45Y UNSERVICEABLE |
|
