Section 10. North American ICAO Region
Provide air traffic control services in the North American ICAO Region with the procedures and minima contained in this section.
- VERTICAL SEPARATION
Provide vertical separation in accordance with:
- Chapter 4, IFR, Section 5, Altitude Assignment and Verification; and
- Facility directives depicting the transition between flight levels and metric altitudes.
- LONGITUDINAL SEPARATION
In accordance with Chapter 8, Offshore/Oceanic Procedures, Section 3, Longitudinal Separation, apply the following:
- Minima based on time:
- 15 minutes between turbojet aircraft.
- The prescribed minima in accordance with Paragraph 8-3-3, Mach Number Technique.
- 20 minutes between other aircraft.
- Clear an aircraft for an ADS-B In Trail Procedure (ITP) climb or descent provided the following conditions are satisfied:
- The ITP climb or descent has been requested by the pilot;
- The aircraft identification of each reference aircraft in the ITP request exactly matches the Item 7 - aircraft identification of the corresponding aircraft's filed flight plan;
- The reported ITP distance between the ITP aircraft and any reference aircraft is 15 NM or more;
- Both the ITP aircraft and reference aircraft are either on:
- same identical tracks and any turn at a waypoint shall be limited to less than 45 degrees; or
- same tracks with no turns permitted that reduce required separation during the ITP.
Same identical tracks are where the angular difference is zero degrees.
- No speed or route change clearance shall be issued to the ITP aircraft until the ITP climb or descent is completed;
- The altitude difference between the ITP aircraft and any reference aircraft shall be 2000 ft or less;
- No instruction to amend speed, altitude or route shall be issued to any reference aircraft until the ITP climb or descent is completed;
- The maximum closing speed between the ITP aircraft and each reference aircraft shall be Mach 0.06; and
- The ITP aircraft shall not be a reference aircraft in another ITP clearance.
ATOP is designed to check for the above criteria prior to allowing the minima to be provided.
- Minima based on distance using Automatic Dependent Surveillance – Contract (ADS-C) in the Anchorage Oceanic and Anchorage Continental CTAs only:
The minima described in this paragraph are not applicable within airspace in the Anchorage Arctic CTA.
- Apply the minima as specified in between aircraft on the same track within airspace in the Anchorage Oceanic and Anchorage Continental CTAs designated for Required Navigation Performance (RNP), provided:
- Direct controller/pilot communication via voice or Controller Pilot Data Link Communications (CPDLC) is established, and
- The required ADS-C periodic reports are maintained and monitored by an automated flight data processor (for example, ATOP).
Maximum ADS-C Periodic Reporting Interval
- Aircraft on reciprocal tracks in the Anchorage Oceanic and Anchorage Continental CTAs may be cleared to climb or descend to or through the altitude(s) occupied by another aircraft provided:
- An ADS-C position report on at least one of the aircraft has been received beyond the passing point, and
- The aircraft have passed each other by the applicable separation minimum.
ATOP has been designed to check for the above criteria prior to allowing the minima to be provided.
- When an ADS-C periodic or waypoint change event report is overdue by 3 minutes, the controller must take action to obtain an ADS-C report.
- If no report is received within 6 minutes of the time the original report was due, the controller must take action to apply another form of separation.
- Aircraft on the same track may be cleared to climb or descend through the level of another aircraft provided:
- The longitudinal distance between the aircraft is determined from near simultaneous ADS-C demand reports and the ATOP software is used to ensure the following conditions are met;
- The longitudinal distance between the aircraft, as determined in a) above, is not less than:
- 15 NM when the preceding aircraft is at the same speed or faster than the following aircraft; or
- 25 NM when the following aircraft is not more than Mach 0.02 faster than the preceding aircraft.
- The altitude difference between aircraft is not more than 2000 ft;
- The clearance is for a climb or descent of 4000 ft or less;
- Both aircraft are filed as single flights not flying in formation with other aircraft;
- Both aircraft are in level flight at a single altitude;
- Both aircraft are same direction;
- Neither aircraft are on a weather deviation;
- Neither aircraft have an open CPDLC request for a weather deviation;
- Neither aircraft are on an offset with a rejoin clearance; and
- The clearance is issued with a restriction that ensures vertical separation is re-established within 15 minutes from the first demand report request.
- LATERAL SEPARATION
In accordance with Chapter 8, Offshore/Oceanic Procedures, Section 4, Lateral Separation, apply the following:
- 50 NM to RNP-10 approved aircraft within areas where RNP-10 separation and procedures are authorized,
- 30 NM to RNP-4 approved aircraft operating within the Anchorage Oceanic CTA and Anchorage Continental CTA when direct controller/pilot communications, via voice or Controller Pilot Data Link Communications (CPDLC), and the required ADS-C contracts are maintained and monitored by an automated flight data processor (for example, ATOP).
The minimum described in subparagraph b is not applicable within airspace in the Anchorage Arctic CTA.
- 90 NM to aircraft not covered by subparagraphs a or b.