| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | PM | Aerodrome operating minima | | | CH | changed | | | / | | | 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 | A | Aerodrome information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 999 | Unlimited | | | / | | | Centre Latitude | 5047N | 50° 47' North' | | Centre Longitude | 00151W | 1° 51' West | | Radius of area affected | 005 | 5 nautical miles |
| | AIR TRAFFIC CONTROL SURVEILLANCE MINIMUM ALTITUDE CHART-SMAA 1700 CHANGED TO 1800.UK AERONAUTICAL INFORMATION PUBLICATION AERODROME 2.EGHH-5-1. |
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