| 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 | 009 | 900 feet QNE | | | / | | | Centre Latitude | 5223N | 52° 23' North' | | Centre Longitude | 00015W | 0° 15' West | | Radius of area affected | 001 | 1 nautical miles |
| | C BAND HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) IN LOW FLYING AREA 6 AND NIGHT SECTOR 5A WITHIN 0.1NM RADIUS OF POSITION 522245N 0001432W ( ALCONBURY,CAMBRIDGESHIRE ) MAXIMUM HEIGHT 340FT ABOVE GROUND LEVEL.24 / 04 / 158 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.0593 NM 39FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.0567 NM 23FT ABOVE GROUND LEVEL LOW 0.0627 NM 59FT ABOVE GROUND LEVEL MEDIUM 0.0814 NM 173FT ABOVE GROUND LEVEL HIGH 0.1088 NM 340FT ABOVE GROUND LEVEL |
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