| 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 | 5142N | 51° 42' North' | | Centre Longitude | 00147W | 1° 47' West | | Radius of area affected | 012 | 12 nautical miles |
| | TEMPORARY TRANSPONDER MANDATORY ZONE ( TMZ ) INSTALLED WITHIN AREA BOUNDED BY : 514444.15N 0015846.96W-514556.30N 0015201.86W-514758.04N 0014103.83W THEN THE CLOCKWISE ARC OF A CIRCLE RADIUS 8NM CENTRED 514101.00N 0014724.00W TO 513916.06N 0013451.84W-513909.06N 0013958.09W THEN THE CLOCKWISE ARC OF A CIRCLE RADIUS 5NM CENTRED 514101.00N 0014724.00W TO 513618.12N 0015003.71W-513515.37N 0015617.72W THEN THE CLOCKWISE ARC OF A CIRCLE RADIUS 8NM CENTRED 514101.00N 0014724.00W TO 514444.15N 0015846.96W ( 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 068 / 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 / 05. |
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