| 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 | 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 8NM RADIUS POSITION 514101N 0014724W ( 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 AIR TRAFFIC CONTROL APPROVAL.ACCESS TO THE TMZ WITHOUT SERVICEABLE TRANSPONDER EQUIPMENT,AS DEFINED IN GEN 1.5 PARAGRAPH 5.3,IS SUBJECT TO SPECIFIC APPROVAL OF THE CONTROLLING AUTHORITY.FOR INFO CONTACT BRIZE ZONE CHANNEL 119.005 OR TEL 01993 897878.AR-2026-1761 / 01. |
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