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6.1.2 In the North Atlantic Region there are six aeronautical radio stations, one associated with
each of the Oceanic Control Areas. They are: Bodo Radio (Norway, Bodo ACC), Gander Radio (Canada,
Gander OACC), Iceland Radio (Iceland, Reykjavik ACC), New York Radio (USA, New York OACC),
Santa Maria Radio (Portugal, Santa Maria OACC) and Shanwick Radio (Ireland, Shanwick OACC).
However, the aeradio stations and OACs are not necessarily co-located. For example in the case of
Shanwick operations, the OAC is located at Prestwick in Scotland whilst the associated aeradio station is at
Ballygirreen in the Republic of Ireland. In addition to those six aeronautical stations, there are two other
stations that operate NAT frequencies. They are Canarias Radio which serves Canarias ACC and Arctic
Radio serving Edmonton, Winnipeg and Montreal ACC’s.
6.1.3 To support air/ground ATC communications in the North Atlantic Region, twenty-four HF
frequencies have been allocated, in different bands (ranging from 2.8 to 18 MHz). There are a number of
factors which affect the optimum frequency for communications over a specific path. The most significant is
the diurnal variation in intensity of the ionisation of the refractive layers of the ionosphere. Hence
frequencies from the lower HF bands tend to be used for communications during night-time and those from
the higher bands during day-time. Generally in the North Atlantic frequencies of less than 7 MHz are
utilised at night and frequencies greater than 8 MHz during the day. The 24 NAT frequencies are organized
into six groups known as Families. The families are identified as NAT Family A, B, C, D, E and F. Each
Family contains a range of frequencies from each of the HF frequency bands. A number of stations share
families of frequencies and co-operate as a network to provide the required geographical and time of day
coverage.. A full listing of the frequency hours of operation of each NAT aeradio station is contained in the
“HF Management Guidance Material for the NAT Region” – ICAO NAT Doc.003 (Appendices 1 thru 6),
available via the NAT-PCO website at http://www.nat-pco.org . Each Family is designated for use by
aircraft of specific States of Registry and according to the route to be flown. NAT ATS provider State AIPs
list the families of frequencies to be used.
6.1.4 Each individual aircraft is normally allocated a primary and a secondary HF frequency,
either when it receives its clearance or by domestic controllers shortly before the oceanic boundary.
6.1.5 When initiating contact with an aeradio station the pilot should state the HF frequency in
use. HF Radio operators usually maintain a listening watch on more than one single frequency.
Identification by the calling pilot of the particular frequency being used, is helpful to the radio operator.
SELCAL
6.1.6 When using HF communications and even when using ADS and/or CPDLC, pilots
should maintain a listening watch on the assigned frequency, unless SELCAL is fitted, in which case they
should ensure the following sequence of actions:
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 27 Edition 2005
(1) provision of the SELCAL code in the flight plan; (any subsequent change of aircraft for a flight
will require passing the new SELCAL information to the OAC);
(2) checking the operation of the SELCAL equipment, at or prior to entry into Oceanic airspace, with
the appropriate aeradio station. (This SELCAL check must be completed prior to commencing
SELCAL watch); and
(3) maintenance thereafter of a SELCAL watch
6.1.7 It is important to note that it is equally essential to comply with the foregoing SECAL
provisions even if ADS and/or CPDLC are being used for routine air/ground ATS communications.
This will ensure that ATC has a means of contacting the aircraft even if data communications fail.
Twelve Tone SELCAL
6.1.8 Flight management staffs and crews of aircraft equipped with 12-tone SELCAL equipment
should be made aware that SELCAL code assignment is predicated on the usual geographical area of
operation of that aircraft. If the aircraft is later flown in geographical areas other than as originally specified
by the aircraft operator, the aircraft may encounter a duplicate SELCAL code situation. Whenever an
aircraft is to be flown routinely beyond the area of normal operations or is changed to a new geographic
operating area, the aircraft operator should contact the SELCAL Registrar and request a SELCAL code
appropriate for use in the new area.
6.1.9 When acquiring a previously owned aircraft equipped with SELCAL, many aircraft
operators mistakenly assume that the SELCAL code automatically transfers to the purchaser or lessee. This
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