Section 7. North Atlantic ICAO Region
8-7-1. APPLICATION
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
Provide vertical separation in accordance with
Chapter 4, IFR,
Section 5, Altitude Assignment
and Verification.
8-7-3. LONGITUDINAL SEPARATION
In accordance with Chapter 8,
Offshore/Oceanic Procedures,
Section 3, Longitudinal Separation, apply the following:
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.
2. 15 minutes between aircraft in supersonic
flight not covered in subpara a1 above.
b. Turbojet operations (subsonic flight):
1. Apply the prescribed minima in accordance
with para 8-3-3, Mach Number Technique;
or
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.
NOTE-
The WATRS area is defined as beginning at a point
27°00'N/77°00'W direct to 20°00'N/67°00'W direct to
18°00'N/62°00'W direct to 18°00'N/60°00'W direct to
38°30'N/60°00'W direct to 38°30'N/69°15'W, thence
counterclockwise along the New York Oceanic CTA/FIR
boundary to the Miami Oceanic CTA/FIR boundary,
thence southbound along the Miami Oceanic CTA/FIR
boundary to the point of beginning.
8-7-4. LATERAL SEPARATION
In accordance with Chapter 8,
Offshore/Oceanic Procedures,
Section 4, Lateral Separation,
apply the following:
a. 60 NM or 1 degree latitude between:
1. Supersonic aircraft operating above FL 275.
2. Aircraft which meet the MNPS and which:
NOTE-
This reduced lateral separation shall not be used if track
keeping capability of the aircraft has been reduced for any
reason.
(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.
b. 90 NM or 1 and 1/2 degrees latitude between
aircraft operating:
1. Within WATRS;
2. Between the U.S., Canada, and Bermuda;
3. West of 55° West between the U.S., Canada,
or Bermuda and points in the Caribbean ICAO
Region.
c. 120 NM or 2 degrees latitude between aircraft
not covered by subparas a or b above.
NOTE-
Tracks may be spaced with reference to their difference in
latitude, provided that in any interval of 10 degrees of
longitude the change in latitude of at least one of the tracks
does not exceed 3 degrees when operating south of
58°North.
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 shall 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 shall:
a. Advise the pilot unable to issue clearance for
requested deviation;
b. Advise the pilot of conflicting traffic; and
c. Request pilot's intentions.
PHRASEOLOGY-
UNABLE (requested deviation), TRAFFIC IS (call sign,
position, altitude, direction), ADVISE INTENTIONS.
NOTE-
1. The pilot will advise ATC of intentions by the most
expeditious means available.
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.
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