| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | AT | Class B Airspace | | | 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 | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 100 | 10000 feet QNE | | | / | | | Centre Latitude | 5129N | 51° 29' North' | | Centre Longitude | 00028W | 0° 28' West | | Radius of area affected | 100 | 100 nautical miles |
| | LOW ATMOSPHERIC PRESSURE IS FCST IN THE LONDON TMA.ALL PILOTS,ESPECIALLY THOSE INBD TO OR OUBD FROM HEATHROW,GATWICK,LUTON,STANSTED,LONDON CITY,BIRMINGHAM,BIGGIN HILL,SOUTHEND,OXFORD,FARNBOROUGH AND SOUTHAMPTON ARE TO EXER EXTREME CAUTION WHEN CLIMBING OR DESCENDING THROUGH THE TRL DUE TO SIG DIFFERENCE BTN THE AERODROME QNH AND THE STD ATMOSPHERIC PRESSURE SETTING. |
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