CAP 413
Radiotelephony Manual
Chapter 2 Page 17
• Windshear Warnings
• Essential Aerodrome Information
• Equipment serviceability (i.e. ILS/navigational aids)
• Weather hazards (thunderstorms, hail, icing, etc.)
1.15
Withholding Clearances
1.15.1
It may be considered expedient by Government to withhold an ATC clearance to
aircraft, particularly if the aircraft has not entered UK national airspace. When
authorised, the following phraseology is to be used.
1.15.2
The Aerodrome Authority and certain other persons are empowered to prohibit flight
and they may instruct a controller to withhold a clearance. If a controller has not been
instructed to withhold clearance but has reason to believe that a planned flight is liable
to endanger life or involve a breach of legislation, the controller is to warn the pilot of
the hazardous condition or apparent infringement and obtain an acknowledgement of
the message. The hazardous condition may be reported by an outside agency or
observed by the controller. Because of possible legal action when pilots disregard the
warnings described above, it is essential that clear and precise messages are passed
to the pilots concerned and acknowledgements obtained. Further transmissions may
be necessary to ascertain the intentions of the pilot.
BIGJET 347, I am instructed by Her
Majesty's Government to refuse
entry into United Kingdom airspace.
What are your intentions?
BIGJET 347, I am instructed by Her
Majesty's Government to inform
you that landing clearance has been
refused for any airfield within the
United Kingdom. What are your
intentions?
BIGJET 347, I am instructed by Her
Majesty's Government that you are
to hold at KTN at FL270.
Acknowledge
BIGJET 347, I am informed that
there may be damage to the port
wing tip of your aircraft. It appears
that your planned flight is liable to
endanger life. Acknowledge
G-ABCD, you are advised surface
wind 280 degrees 37 knots gusting
50. It appears that your planned
flight is liable to endanger life.
Acknowledge
31 March 2011
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