| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | PO | Obstacle clearance altitude | | | CH | changed | | | / | | | Traffic | I | IFR 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 | 5134N | 51° 34' North' | | Centre Longitude | 00042E | 0° 42' East | | Radius of area affected | 005 | 5 nautical miles |
| | VM ( C ) CATEGORY A MINIMA INCREASED TO OBSTACLE CLEARANCE ALTITUDE / OBSTACLE CLEARANCE HEIGHT 620 ( 565 ) DUE TO TEMPORARY OBSTRUCTION POSITION 513240.43N 0004048.55E |
|
