CAP 413
Radiotelephony Manual
Chapter 3 Page 5
1.3
Speed Control
1.3.1
Controllers may instruct pilots to increase/decrease speed in order to maintain the
appropriate separation.
1.3.2
The following phraseology shall be used by controllers when providing speed control
to aircraft at or above FL280 that have been cleared to levels below FL280.
1.3.2.1
Where the controller only requires speed control to apply following the point at which
the aircraft changes over from Mach number to IAS, the phraseology to be used by
the controller is:
1.3.2.2
Where the controller requires the aircraft to fly at a specific Mach number until the
changeover to IAS and then fly a specified IAS, the phraseology to be used by the
controller is:
BIGJET 347, reduce speed to Mach
0·7
Reduce speed to Mach 0·7, BIGJET
347
BIGJET 347, maintain present speed
Maintain present speed, BIGJET 347
BIGJET 347, maintain 250 knots or
greater
Maintain 250 knots or greater, BIGJET
347
BIGJET 347, not above 250 knots
Not above 250 knots, BIGJET 347
BIGJET 347, reduce to minimum
clean speed
Reduce to minimum clean speed,
BIGJET 347
BIGJET 347, reduce to minimum
approach speed
Reduce to minimum approach speed,
BIGJET 347
BIGJET 347, maintain 160 knots
until 4 miles final
Maintain 160 knots until 4 miles final,
BIGJET 347
BIGJET 347, maintain 160 knots
until outer marker
Maintain 160 knots until outer marker,
BIGJET 347
BIGJET 347, descend FL120, on
speed conversion, 250 knots
Descend FL120, on speed conversion,
250 knots, BIGJET 347
BIGJET 347, Mach ·78, on speed
conversion, 250 knots
31 March 2011
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