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.
d.
Minima based on distance using Automatic
Dependent Surveillance – Contract (ADSC):
1.
Apply the minima as specified in TBL 8-7-1
between aircraft on the same track within
airspace designated for Required Navigation
Performance (RNP), provided:
(a)
Direct controller/pilot communication via voice or
Controller Pilot Data Link Communications (CPDLC) is established, and
(b)
The required ADSC periodic reports
are maintained and monitored by an automated
flight data processor (for example, Ocean21).
TBL 8-7-1
ADSC Criteria
Minima
|
RNP
|
Maximum ADS-C
Periodic Reporting
Interval
|
50 NM
|
10
|
27 minutes
|
50 NM
|
4
|
32 minutes
|
30 NM
|
4
|
10 minutes
|
2. Aircraft on reciprocal tracks may be
cleared to climb or descend to or through the
altitude(s) occupied by another aircraft
provided:
(a) An ADS-C position report on at least one
of the aircraft has been received beyond the
passing point, and
(b) The aircraft have passed each other by
the applicable separation minimum.
NOTE-
Ocean21 has been designed to check for the above
criteria prior to allowing the minima to be provided.
3.
When an ADS-C periodic or waypoint
change event report is overdue by 3 minutes, the
controller must take action to obtain an ADSC
report.
4. 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.
8-7-4. LATERAL SEPARATION
In accordance with Chapter 8,
Offshore/Oceanic Procedures,
Section 4, Lateral Separation,
apply the following:
a.
30 NM to RNP-4 approved aircraft operating
within airspace designated for RNP-4 when
direct controller/pilot communications, via
voice or Controller Pilot Data Link
Communications (CPDLC), and the required
ADSC contracts are maintained and monitored
by an automated flight data processor (e.g.,
Ocean21).
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.
NOTE-
This reduced lateral separation must not be used if
track-keeping capability of the aircraft has been reduced
for any reason.
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.
NOTE-
This reduced lateral separation must not be used if
track-keeping capability of the aircraft has been reduced
for any reason.
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.
d. 120 NM or 2 degrees latitude between aircraft
not covered by subparas a, b or c 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 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.
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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