| 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 | 5117N | 51° 17' North' | | Centre Longitude | 00047W | 0° 47' West | | Radius of area affected | 005 | 5 nautical miles |
| | CHANGE TO OBSTACLE CLEARANCE ALTITUDE ( OBSTACLE CLEARANCE HEIGHT ) RUNWAY 24 APPROACH.CHARTS EGLF-8-4 AND EGLF-8-5 REFERS.AIRCRAFT CATEGORY A 539 ( 320 ) / B 552 ( 333 ) / C 565 ( 346 ) / D 575 ( 356 ) |
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