| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | AF | Flight information region (FIR) | | | 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 | | | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 100 | 10000 feet QNE | | | / | | | Centre Latitude | 5141N | 51° 41' North' | | Centre Longitude | 00147W | 1° 47' West | | Radius of area affected | 009 | 9 nautical miles |
| | TEMPORARY TRANSPONDER MANDATORY ZONE ( TMZ ) INSTALLED WITHIN AREA BOUNDED BY : 513544N 0014246W-513350N 0014147W THEN THE CLOCKWISE ARC OF A CIRCLE RADIUS 8NM CENTRED 514101N 0014724W TO 513647N 0013630W-513724N 0013859W THEN THE ANTI-CLOCKWISE ARC OF A CIRCLE RADIUS 1.5NM CENTRED 513614N 0014030W TO 513544N 0014246W ( FAIRFORD AERODROME ). TMZ ACTIVE H24 SURFACE TO FL100.FOR AIRCRAFT EQUIPPED WITH AND OPERATING SECONDARY SURVEILLANCE RADAR EQUIPMENT,AS DEFINED IN GEN 1.5 PARAGRAPH 5.3,ACCESS TO THE TMZ IS NOT SUBJECT TO TO AIR TRAFFIC CONTROL APPROVAL.ACCESS TO THE TMZ WITHOUT SERVICEABLE TRANSPONDER EQUIPMENT,AS DEFINED IN GEN 1.5 PARAGRAPH 5.3,IS SUBJECT TO TO SPECIFIC APPROVAL OF THE CONTROLLING AUTHORITY.A BRIEFING SHEET BFS 016 / 2026 WITH CHART REFERS.FURTHER DETAILS WWW.NATS.AERO / AIS.FOR INFO CONTACT BRIZE ZONE CHANNEL 119.005 OR TEL 01993 897878.AR-2026-1761 / 04. |
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