Nat doc 001 Guidance and Information Material Concerning
equipped with two fully serviceable Long Range Navigation Systems (LRNS)
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| equipped with two fully serviceable Long Range Navigation Systems (LRNS). INS, ISS, IRS and FMCS Equipments 4.4.5 Extensive experience has been gained, both in the NAT Region and worldwide, in the use of Inertial Navigation Systems (INS, Inertial Sensor Systems (ISS, Inertial Reference Systems (IRS) and Flight Management Computer Systems (FMCS). ISS/IRS, when coupled with a FMCS for automatic flight guidance, have clearly demonstrated a capability to meet the MNPS. Some aircraft may carry two IRS (or ISS) but only one FMCS. Such an arrangement may meet track keeping parameters but does not provide the required redundancy (in terms of continuous indication of position relative to track or of automatic steering guidance) should the FMCS fail therefore, in order to obtain MNPS certification, dual FMCS is required to be carried. For example a single INS is considered to be a LRNS; and an FMCS with inputs from one or more IRS/ISS is also considered to be a LRNS. Global Navigation Satellite System (GNSS) Equipment 4.4.6 The emergence of GNSS raises the following issues for users, ATS Providers, States of Registry and safety regulators 4-4 North Atlantic Guidance Material 7 th Edition ab System Safety. A low level of GNSS-based navigation is not expected to affect overall system safety. However, the inherent extremely high horizontal accuracy of GNSS will eventually increase the probability of collision, following a loss of vertical separation. To mitigate such an effect, it is expected that appropriate operational procedures will have to be considered. This will be necessary when a significant proportion of aircraft in the NAT use GNSS for navigation. Monitoring the use of GNSS in such airspace is therefore required in order to identify when appropriate operational procedures might be needed and to ensure that system safety is not adversely affected. States of Registry are therefore required to provide details of GNSS approvals to the North Atlantic Central Monitoring Agency (CMA). (See Part 5) b) Institutional Considerations. Whilst the NAT SPG should be cognisant of institutional considerations, it is the responsibility of individual States to resolve such concerns. States may wish to take account of the following institutional aspects i) Download 0.84 Mb. Share with your friends:
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