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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 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, these communications are with an aeradio station and the pilot is not in direct contact with ATC. However Direct Controller/Pilot Communications (DCPC) can be arranged, if necessary, via patch-through on some GP/VHF frequencies.
6.1.12 Reykjavik centre operates several Direct Controller Pilot Communications (DCPC) VHF stations providing coverage to approximately 250 NM from the coast of Iceland and Faroes. Those stations are used to provide tactical procedural control and radar control within the South and East sectors of the Reykjavik area. The callsign of the Reykjavik centre is “Reykjavik control” or just “Reykjavik” and indicates that the pilot is communicating directly with an air traffic controller. The callsign of Iceland radio
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 29 Edition 2009
is “Iceland radio” or just “Iceland” and indicates that the pilot is communicating with a radio operator who is relaying messages between the pilot and the appropriate control facility.
6.1.13 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.
SATCOM Voice Communications
6.1.14 Following successful trials, SATCOM ATS air/ground voice may now be used for any routine, non-routine or emergency communications throughout the NAT Region. State AIPs contain the necessary telephone numbers and/or short-codes for air-initiated call access to aeradio stations and/or direct to OACs. 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. 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/redundant HF communications equipment much less of an issue (Reference HF Communications Failure). Pilots electing to use SATCOM voice as an alternative to HF voice communications remain responsible for operating SELCAL or maintaining a listening watch on the assigned HF frequency.
Datalink Communications
6.1.15 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.paris.icao.int/. AIS publications of the NAT ATS Provider States should be consulted to determine the extent of current implementation in each of the North Atlantic OCAs
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NORTH ATLANTIC MNPS AIRSPACE OPERATIONS MANUAL(26)
