Section 7. North Atlantic ICAO Region
Provide air traffic control services in the North Atlantic ICAO Region with the procedures and minima contained in this section except when noted otherwise.
8-7-2. VERTICAL SEPARATION
8-7-3. LONGITUDINAL SEPARATION
a. Supersonic flight:
1. 10 minutes provided that:
(a) both aircraft are in level flight at the same Mach number or the aircraft are of the same type and are both operating in cruise climb, and one of the following;
(1) The aircraft concerned have reported over a common point; or,
(2) If the aircraft have not reported over a common point, the appropriate time interval being applied between aircraft exists and will exist at the common point; or,
(3) If a common point does not exist, the appropriate time interval being applied between aircraft exists and will exist at significant points along each track.
b. Turbojet operations (subsonic flight):
2. Where tracks diverge from the common point and the following aircraft is maintaining a greater Mach Number than the preceding aircraft:
(a) At least 10 minutes longitudinal separation exists at the point where the tracks diverge; and
(b) At least 5 minutes longitudinal separation will exist where minimum lateral separation is achieved (whichever is estimated to occur first);
(1) At or before the next significant point (normally within ten degrees of longitude along track(s)), or
(2) Within 90 minutes of the time the following aircraft passes the common point, or
(3) Within 600 NM of the common point.
3. Apply 15 minutes between all other turbojet aircraft.
c. Nonturbojet operations:
1. Apply 20 minutes between aircraft operating in the West Atlantic Route System (WATRS), or
2. Apply 30 minutes between aircraft operating outside of the WATRS.
8-7-4. LATERAL SEPARATION
a. 50 NM between Required Navigation Performance (RNP 4 or RNP 10) approved aircraft which:
1. Operate on routes or in areas within WATRS, the San Juan CTA/FIR or the Atlantic portion of the Miami Oceanic CTA/FIR; or
2. Operate in the New York Oceanic CTA/FIR outside of WATRS.
b. 60 NM or 1 degree latitude between:
1. Supersonic aircraft operating above FL 275.
2. Aircraft which meet the MNPS and which:
(a) Operate within MNPS airspace; or
(b) Are in transit to or from MNPS airspace; or
(c) Operate for part of their flight within, above, or below MNPS airspace.
c. 90 NM or 1 and 1/2 degrees latitude between aircraft not approved for RNP 4 or RNP 10 and which:
1. Operate on routes or in areas within WATRS, the San Juan CTA/FIR or the Atlantic portion of the Miami CTA/FIR;
2. Operate between points in the U.S. or Canada, and Bermuda;
3. Operate west of 55° West between the U.S., Canada, or Bermuda and points in the Caribbean ICAO Region.
8-7-5. PROCEDURES FOR WEATHER DEVIATIONS IN NORTH ATLANTIC (NAT) AIRSPACE
Aircraft must request an ATC clearance to deviate. Since aircraft will not fly into known areas of weather, weather deviation requests should take priority over routine requests. If there is no traffic in the horizontal dimension, ATC must issue clearance to deviate from track; or if there is conflicting traffic in the horizontal dimension, ATC separates aircraft by establishing vertical separation. If there is conflicting traffic and ATC is unable to establish the required separation, ATC must:
a. Advise the pilot unable to issue clearance for requested deviation;
b. Advise the pilot of conflicting traffic; and
c. Request pilot's intentions.
2. In the event that pilot/controller communications cannot be established or a revised ATC clearance is not available, pilots will follow the procedures outlined in the Regional Supplementary Procedures, ICAO Doc. 7030.