JO 7110.65 5-7-3

When assigning airspeeds, use the following:

To aircraft operating between FL 280 and 10,000 feet, a speed not less than 250 knots or the equivalent Mach number. NOTE-

On a standard day the Mach numbers equivalent to 250 knots calibrated airspeed (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.

A pilot will advise if unable to comply with the speed assignment.

To aircraft operating beneath Class B airspace or in a VFR corridor designated through Class B airspace: assign a speed not more than 200 knots.

To arrival aircraft operating below 10,000 feet: Turbojet aircraft: Assign a speed not less than 210 knots, except for the aircraft as specified in subparagraph b above, or

Assign a speed not less than 170 knots when the aircraft is within 20 flying miles of the runway threshold.

Reciprocating and turboprop aircraft: Assign a speed not less than 200 knots, or

Assign a speed not less than 150 knots when the aircraft is within 20 flying miles of the runway threshold.

To departures: Turbojet aircraft: assign a speed not less than 230 knots.

Reciprocating and turboprop aircraft: assign a speed not less than 150 knots.

To helicopters: Assign a speed not less than 60 knots. REFERENCE-

FAA Order JO 7110.65, Para 5-7-2 , Methods.

Lower speeds may be assigned when operationally advantageous. NOTE-

A pilot operating at or above 10,000 feet MSL on an assigned speed adjustment greater than 250 knots is expected to comply with 14 CFR section 91.117(a) when cleared below 10,000 feet MSL, within domestic airspace, without notifying ATC. Pilots are expected to comply with the other provisions of 14 CFR section 91.117 without notification.

Speed restrictions of 250 knots do not apply to aircraft operating beyond 12 NM from the coastline within the U.S. Flight Information Region, in offshore Class E airspace below 10,000 feet MSL. However, in airspaceunderlying a Class B airspace area designated for an airport, or in a VFR corridor designated through such a Class B airspace area, pilots are expected to comply with the 200 knot speed limit specified in 14 CFR section 91.117(c). (See 14 CFR sections 91.117(c) and 91.70).

The phrases “maintain maximum forward speed" and “maintain slowest practical speed" are primarily intended for use when sequencing a group of aircraft. As the sequencing plan develops, it may be necessary to determine the specific speed and/or make specific speed assignments.

REFERENCE-

FAA Order JO 7110.65, Para 5-7-2 , Methods.

14 CFR Sections 91.117(c) and 91.703.