| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | FA | Aerodrome | | | XX | miscellaneous plain language | | | / | | | 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 | 5129N | 51° 29' North' | | Centre Longitude | 00028W | 0° 28' West | | Radius of area affected | 005 | 5 nautical miles |
| | LONDON HEATHROW-TIME BASED SEPARATION FOR FINAL APPROACH-AMEND TO READ : A.TIME BASED SEPARATION MINIMA ARE IN PERMANENT USE FOR WAKE TURBULENCE SEPARATION IN PLACE OF UK FIXED DISTANCE MINIMA.THESE ARE BASED ON THE RECAT EU PWS MINIMA.B.IN STRONGER HEADWINDS,A MODERATE REDUCTION IN SEPARATION DISTANCES BETWEEN LEAD AND FOLLOWER AIRCRAFT MAY BE OBSERVED IN COMPARISON TO RECAT EU PWS DISTANCED BASED WAKE TURBULENCE MINIMA.C.REQUESTS FOR AREA NAVIGATION ( GNSS ) APPROACHES MAY BE REFUSED BY HEATHROW DIRECTOR TO ENSURE RUNWAY EFFICIENCY IS MAINTAINED.UK AERONAUTICAL INFORMATION PUBLICATION AERODROME 2.23-2 REFERS. |
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