General 12 Speed Control

Question 1

In what circumstances should speed control not be applied?

Answer 1

(1) In holding patterns, other than where published on approach charts
(2) In areas of thunderstorms or known turbulence
(3) After 4NM on Approach

Question 2

At or above FL280, how should ATCOs express speed adjustments?

Answer 2

At or above FL280, speed adjustments for aircraft in the cruise should be expressed in multiples of 0.01 Mach

Question 3

Below FL280, how should ATCOs express speed adjustments?

Answer 3

Below FL280, speed adjustments should be expressed in multiples of 10 kt based on indicated airspeed (IAS)