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during day-time. Generally in the North Atlantic frequencies of less than 7 MHz are utilised at night and
frequencies of 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 C- 1 thru 6),
available via the ICAO EUR/NAT website at www.paris.icao.int/ . 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 28 Edition 2009
a) 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);
b) 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
c) 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.
SELCAL Code Assignment
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
is not true. As soon as practical, it is the responsibility of the purchaser or lessee to obtain a SELCAL code
from the Registrar, or, if allocated a block of codes for a fleet of aircraft, to assign a new code from within
the block of allocated codes. In the latter instance, if 12-tone equipment is involved, the Registrar should be
consulted when there is any question as to the likely geographical area of operation and the possibility of
code duplication.
6.1.10 The registrar can be contacted via the AFTN address KDCAXAAG, and by including
“ATTN. OPS DEPT. (forward to SELCAL Registrar)” as the first line of message text.
VHF Voice Communications
6.1.11 Aeradio stations are also responsible for the operation of General Purpose VHF (GP/VHF)
outlets. North Atlantic flights may use these facilities for all regular and emergency communications with
relevant OACs. Such facilities are especially valuable in the vicinity of Iceland, Faroes and Greenland since
VHF is not as susceptible to sunspot activity as HF. Outlets are situated at Prins Christian Sund, which is
remotely controlled from Gander Aeradio station, and at Qaqatoqaq, Kulusuk, several locations in Iceland
and the Faroes, via Iceland Radio. Theoretical VHF coverage charts are included in the ICAO publication
NAT Doc 001 (available for download at http://www.paris.icao.int/). When using GP/VHF frequencies in
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