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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