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42.7.3 Complies with speed adjustments from ATC unless:
42.7.3.1 Except as stated in paragraphs 42.7.5 and 42.7.6, advises ATC anytime the true airspeed at cruising level varies or is expected to vary by plus or minus 10 knots or 0.02 Mach number, whichever is less, of the filed true airspeed.
42.7.3.2 Complies with speed adjustments from ATC unless:
 a) The minimum or maximum safe airspeed for any particular operation is greater or less than the requested airspeed. In such cases, advises ATC.
 b) Operating at or above 10,000 feet MSL on an ATC assigned SPEED ADJUSTMENT of more than 250 knots IAS and subsequent clearance is received for descent below 10,000 feet MSL. In such cases, pilots are expected to comply with 14 CFR Section 97.117(a).
42.7.4 Controller (In U.S. Domestic Class A, B, C, D, and E Airspaces)
42.7.4.1 Assigns aircraft to speed adjustments when necessary, but not as a substitute for good vectoring technique.
42.7.4.2 Adheres to the restrictions of FAA Order 7110.65, Air Traffic Control, as to when speed adjustment procedures may be applied.
42.7.4.3 Avoids speed adjustments requiring alter-nate decreases and increases.
42.7.4.4 Assigns speed adjustments to a specified IAS knots/Mach number or to increase or decrease speed utilizing increments of 10 knots or multiples thereof.
42.7.4.5 Advises pilots to resume normal speed when speed adjustments are no longer required.
42.7.4.6 Gives due consideration to aircraft capabili-ties to reduce speed while descending.
42.7.5 Pilot (In Oceanic Class A and E Airspace)
42.7.5.1 If ATC has not assigned an airspeed, advises ATC anytime the true airspeed at cruising level varies or is expected to vary by ±10 knots or 0.02 Mach number, whichever is less, of the filed true airspeed.

Federal Aviation Administration Twentieth Edition
42.7.5.2 If ATC has assigned an airspeed, aircraft shall adhere to the ATC assigned airspeed and shall request ATC approval before making any change thereto. If it is essential to make an immediate temporary change in the Mach number (e.g., due to turbulence), ATC shall be notified as soon as possible. If it is not feasible, due to aircraft performance, to maintain the last assigned Mach number during an en route climb or descent, advises ATC at the time of the request.
42.7.6 Controller (In Oceanic Class A and E Airspace)
42.7.6.1 Assigns airspeed when necessary for separation of aircraft to comply with 14 CFR, ICAO regulations and procedures, or letters of agreement.
42.8 Traffic Advisories (Traffic Information)
42.8.1 Pilot
42.8.1.1 Acknowledges receipt of traffic advisories.
42.8.1.2 Informs controller if traffic is in sight.
42.8.1.3 Advises ATC if a vector to avoid traffic is desired.
42.8.1.4 Does not expect to receive radar traffic advisories on all traffic. Some aircraft may not appear on the radar display. Be aware that the controller may be occupied with high priority duties and unable to issue traffic information for a variety of reasons.
42.8.1.5 Advises controller if service is not desired.
42.8.2 Controller
42.8.2.1 Issues radar traffic to the maximum extent consistent with higher priority duties except in Class A airspace.
42.8.2.2 Provides vectors to assist aircraft to avoid observed traffic when requested by the pilot.
42.8.2.3 Issues traffic information to aircraft in Class D airspace for sequencing purposes.
42.8.2.4 Controllers are required to issue to each aircraft operating on intersecting or nonintersecting converging runways where projected flight paths will cross.
42.9 Safety Alert
42.9.1 Pilot
42.9.1.1 Initiates appropriate action if a safety alert is received from ATC.
42.9.1.2 Be aware that this service is not always available and that many factors affect the ability of the controller to be aware of a situation in which unsafe proximity to terrain, obstructions, or another aircraft may be developing.
42.9.2 Controller
42.9.2.1 Issues a safety alert if aware an aircraft under their control is at an altitude which, in the controller’s judgment, places the aircraft in unsafe proximity to terrain, obstructions, or another aircraft. Types of safety alerts are:
   a) Terrain/Obstruction Alerts. Immediately is-sued to an aircraft under their control if aware the aircraft is at an altitude believed to place the aircraft in unsafe proximity to terrain/obstruction.
   b) Aircraft Conflict Alerts. Immediately issued to an aircraft under their control if aware of an aircraft not under their control at an altitude believed to place the aircraft in unsafe proximity to each other. With the alert, they offer the pilot an alternative if feasible.
42.9.2.2 Discontinues further alerts if informed by the pilot action is being taken to correct the situation or that the other aircraft is in sight.
　
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