| 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 06 APPROACH 5 PERCENT CLIMB GRADIENT.CHART EGLF-8-1 REFERS.AIRCRAFT CATEGORY A 491 ( 266 ) / B 505 ( 280 ) / C 518 ( 293 ) / D 527 ( 302 ) |
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