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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 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.nat-pco.org/). When using GP/VHF frequencies in areas of fringe coverage
however, care should be taken to maintain a SELCAL watch on HF thus ensuring that if VHF contact is lost
the aeradio station is still able to contact the aircraft. It is important for the pilot to appreciate that when
using GP/VHF communications they are with an aeradio station and not by direct contact with ATC.
However Direct Controller/Pilot Communications (DCPC) can be arranged if necessary on some GP/VHF
frequencies.
6.1.12 The carriage of HF communications equipment is mandatory for flight in the Shanwick
OCA. Aircraft with only functioning VHF communications equipment should plan their route outside the
Shanwick OCA and ensure that they remain within VHF coverage of appropriate ground stations throughout
the flight.. Details of communication requirements are published in State AIPs and ICAO publications.
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 28 Edition 2005
SATCOM Voice Communications
6.1.13 SATCOM ATS air/ground voice communications are in various stages of trial and/or
implementation in all the North Atlantic OCAs. State AIPs contain the necessary telephone numbers and/or
short-codes for air-initiated call access to aeradio stations and/or direct to OACs. Procedures and rules
governing the use of SATCOM Voice for regular or emergency communications are continually developing
as trials proceed. Currently, SATCOM may be used by any equipped aircraft in emergency or non-routine
situations. An unforeseen inability to communicate by HF is deemed to constitute such a non-routine
situation. Since oceanic traffic typically communicate with ATC through aeradio facilities, a SATCOM call
made due to unforeseen inability to communicate by other means should be made to such a facility rather
than the ATC Centre, unless the urgency of the communication dictates otherwise. In addition to this, trials
are presently being conducted in which equipped International General Aviation (IGA) aircraft may provide
waypoint position reports to NAT aeradio facilities via SATCOM. IGA Operators wishing to participate in
these trials must pre-register. Full details of the trials are contained in the document “Guidance Material for
SATCOM WPR Trials in NAT Airspace” available at http://www.nat-pco.org/ . It is expected that these
trials will be progressively expanded in the future to include all suitably equipped aircraft operating in the
Region and to include all regular ATS communications. Operators are, of course, also bound by their own
State of Registry’s regulations regarding carriage and use of any and all long-range ATS communications
equipment. In many instances MMEL remarks for HF systems now provide significant relief for SATCOM
equipped aircraft, thereby making the requirement for the carriage of fully serviceable HF communications
equipment much less of an issue (Reference HF Communications Failure).
Datalink Communications
6.1.14 Datalink communications are gradually being introduced into the NAT environment for
position reporting ( via FANS 1/A ADS & CPDLC and also via FMC WPR through ACARS) and for other
air/ground ATS exchanges (using FANS 1/A CPDLC). Guidance Material containing full details of the
various services and operational procedures can be downloaded from http://www.nat-pco.org/ . AIS
publications of the NAT ATS Provider States should be consulted to determine the extent of current
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