| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | RO | Overflying restriction | | | XX | miscellaneous plain language | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | N | For immediate attention of aircraft operators | | | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | W | Navigational Warning | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 043 | 4300 feet QNE | | | / | | | Centre Latitude | 5214N | 52° 14' North' | | Centre Longitude | 00027W | 0° 27' West | | Radius of area affected | 002 | 2 nautical miles |
| | D BAND HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) OPERATING WITHIN 1NM OF POSITION 521349N 0002645W ( THURLEIGH,BEDFORD ) LOW FLYING AREA 6 AND NIGHT SECTOR 5A.MAXIMUM HEIGHT 4000FT ABOVE GROUND LEVEL.26 / 08 / 255 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.2432NM 1161FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.1157NM 385FT ABOVE GROUND LEVEL LOW 0.2491NM 1195FT ABOVE GROUND LEVEL MEDIUM 0.3625NM 1884FT ABOVE GROUND LEVEL HIGH 0.6710NM 3759FT ABOVE GROUND LEVEL |
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