| 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 | 5321N | 53° 21' North' | | Centre Longitude | 00217W | 2° 17' West | | Radius of area affected | 005 | 5 nautical miles |
| | THE FOLLOWING RAISED MINIMA APPLY DUE CRANE OPERATIONS : RUNWAY 23R LNAV OBSTACLE CLEARANCE ALTITUDE ( OBSTACLE CLEARANCE HEIGHT ) 690 ( 441 ) FOR AIRCRAFT CATEGORY A,B,C AND D.RUNWAY 23R LNAV VNAV OBSTACLE CLEARANCE ALTITUDE ( OBSTACLE CLEARANCE HEIGHT ) 570 ( 321 ) FOR AIRCRAFT CATEGORY A RUNWAY 23R LNAV VNAV OBSTACLE CLEARANCE ALTITUDE ( OBSTACLE CLEARANCE HEIGHT ) 590 ( 341 ) FOR AIRCRAFT CATEGORY B AND C RUNWAY 23R LNAV VNAV OBSTACLE CLEARANCE ALTITUDE ( OBSTACLE CLEARANCE HEIGHT ) 610 ( 361 ) FOR AIRCRAFT CATEGORY D |
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