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restricted to turbojet aircraft with Mach meters.
c. Pilots complying with speed adjustments are
expected to maintain a speed within plus or minus
10 knots or 0.02 Mach number of the specified speed.
d. When ATC assigns speed adjustments, it will be
in accordance with the following recommended
minimums:
1. To aircraft operating between FL 280 and
10,000 feet, a speed not less than 250 knots or the
equivalent Mach number.
NOTE−
1. On a standard day the Mach numbers equivalent to
250 knots CAS (subject to minor variations) are:
FL 240−0.6
FL 250−0.61
FL 260−0.62
FL 270−0.64
FL 280−0.65
FL 290−0.66.
2. When an operational advantage will be realized, speeds
lower than the recommended minima may be applied.
2. To arriving turbojet aircraft operating below
10,000 feet:
(a) A speed not less than 210 knots, except;
(b) Within 20 flying miles of the airport of
intended landing, a speed not less than 170 knots.
3. To arriving reciprocating engine or turboprop
aircraft within 20 flying miles of the runway
threshold of the airport of intended landing, a speed
not less than 150 knots.
AIM 2/17/05
4−4−8 ATC Clearances and Aircraft Separation
4. To departing aircraft:
(a) Turbojet aircraft, a speed not less than
230 knots.
(b) Reciprocating engine aircraft, a speed not
less than 150 knots.
e. When ATC combines a speed adjustment with
a descent clearance, the sequence of delivery, with the
word “then” between, indicates the expected order of
execution.
EXAMPLE−
1. Descend and maintain (altitude); then, reduce speed to
(speed).
2. Reduce speed to (speed); then, descend and maintain
(altitude).
NOTE−
The maximum speeds below 10,000 feet as established in
14 CFR Section 91.117 still apply. If there is any doubt
concerning the manner in which such a clearance is to be
executed, request clarification from ATC.
f. If ATC determines (before an approach
clearance is issued) that it is no longer necessary to
apply speed adjustment procedures, they will inform
the pilot to resume normal speed. Approach
clearances supersede any prior speed adjustment
assignments, and pilots are expected to make their
own speed adjustments, as necessary, to complete the
approach. Under certain circumstances, however, it
may be necessary for ATC to issue further speed
adjustments after approach clearance is issued to
maintain separation between successive arrivals.
Under such circumstances, previously issued speed
adjustments will be restated if that speed is to be
maintained or additional speed adjustments are
requested. ATC must obtain pilot concurrence for
speed adjustments after approach clearances are
issued. Speed adjustments should not be assigned
inside the final approach fix on final or a point 5 miles
from the runway, whichever is closer to the runway.
NOTE−
An instruction to “resume normal speed” does not delete
speed restrictions that are contained in a published
procedure, unless specifically stated by ATC, nor does it
relieve the pilot of those speed restrictions which are
applicable to 14 CFR Section 91.117.
g. The pilots retain the prerogative of rejecting the
application of speed adjustment by ATC if the
minimum safe airspeed for any particular operation is
greater than the speed adjustment.
NOTE−
In such cases, pilots are expected to advise ATC of the
speed that will be used.
h. Pilots are reminded that they are responsible for
rejecting the application of speed adjustment by ATC
if, in their opinion, it will cause them to exceed the
maximum indicated airspeed prescribed by 14 CFR
Section 91.117(a), (c) and (d). IN SUCH CASES,
THE PILOT IS EXPECTED TO SO INFORM ATC.
Pilots operating at or above 10,000 feet MSL who are
issued speed adjustments which exceed 250 knots
IAS and are subsequently cleared below 10,000 feet
MSL are expected to comply with 14 CFR
Section 91.117(a).
i. Speed restrictions of 250 knots do not apply to
U.S. registered aircraft operating beyond 12 nautical
miles from the coastline within the U.S. Flight
Information Region, in Class E airspace below
10,000 feet MSL. However, in airspace underlying a
Class B airspace area designated for an airport, or in
a VFR corridor designated through such as a Class B
airspace area, pilots are expected to comply with the
200 knot speed limit specified in 14 CFR
Section 91.117(c).
j. For operations in a Class C and Class D surface
　
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