| Significance | Code | Meaning |
|---|
| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | NN | TACAN | | | CF | operating frequency(ies) changed | | | / | | | 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 | 999 | Unlimited | | | / | | | Centre Latitude | 5237N | 52° 37' North' | | Centre Longitude | 00029W | 0° 29' West | | Radius of area affected | 025 | 25 nautical miles |
| | TACAN WIT / WITTERING TWO NEW OPERATING FREQUENCY CHANGED TO FREQUENCY 1147.0MHZ AND FREQUENCY 121.0MHZ / CH123X |
|
