CAP 413
Radiotelephony Manual
Chapter 4 Page 38
NOTE 2:
Procedures for certain messages (e.g. when following the requirements
for notification of the flight when there is no ATSU at the destination – see
AIP ENR 1.10), including the phraseology to be used, should be contained
in the aircraft operator’s standard operating procedures and local
operating procedures. These messages are not air traffic service
messages and are not reproduced in this document.
5.5.4
Helideck Movement
5.5.4.1 Helicopter crews must be provided with accurate information regarding the pitch, roll
and heave of the helideck. Reports on pitch and roll should include values, in degrees,
about both axes of the true vertical datum (i.e. relative to the true horizon) and be
expressed in relation to the vessel’s heading.
5.5.4.2 Pitch should be expressed in terms of 'up' and 'down' and roll should be expressed
in terms of ‘left’ and ‘right’. Heave should be reported in a single figure, being the total
heave motion of the helideck rounded up to the nearest metre. Heave is taken to be
the vertical difference between the highest and lowest points of the helideck
movement.
5.5.4.3 A standard radio message should be passed to the pilot containing the information on
the helideck movement in an unambiguous format. Should the crew require other
motion information or amplification of the standard message, they will request it.
5.5.4.4 An example of the 'standard message' would be: '(Pitch, roll and heave). Roll one
degree left and three degrees right; pitch two degrees up and two degrees down;
heave two metres
’.
31 March 2011
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