Guidance concerning Air Navigation in and above the NAT MNPSA
Tactical Monitoring of MNPS and RVSM Approvals
Experience with the monitoring process indicates that a proportion of GNEs and other
operational errors are attributable to aircraft operating in MNPS/RVSM Airspace without the required approvals. It was for this reason that in 1990, to make random checks more effective, the NAT SPG introduced a programme of tactical monitoring to help identify aircraft operating within MNPS Airspace without the required approval. In 1997, this procedure was extended to RVSM approvals, and currently Canada, Iceland and the United Kingdom participate in this programme. Pilots who are uncertain of or are unable to confirm their approval status, are issued a clearance to operate outside MNPS/RVSM Airspace and
a report is forwarded to the CMA for follow-up action.
Operational Error Reporting and Central Monitoring Agency (CMA) Activities
In March 1980, the NAT SPG realised that after implementation of a 60 NM lateral
separation minima, special importance would have to be placed on monitoring and assessment of navigation performance. It was therefore agreed that there was a need to collect, collate and circulate to States participating in the monitoring programme, data regarding navigation performance in the NAT Region To meet this requirement, the NAT CMA was established.
In the early 1990s, as a consequence of the planned implementation of RVSM in NAT
MNPS Airspace, the NAT CMA acquired the responsibility for monitoring height-keeping performance. Initially, this was limited to collating data on operational errors but when the technical height-keeping programme came into being, the CMA became the data collection and collation centre. It has also become responsible, in conjunction with other Regional Monitoring Agencies, for setting the target monitoring
requirements for the RVSM approval process.
The CMA is operated on behalf of the NAT SPG by United Kingdom National Air Traffic
Services Limited (NATS) and is responsible for the collection, analysis and dissemination of all data relevant
to horizontal and vertical participating States, ICAO operational performance to information. The CMA is
navigation and other
(and systems) performance in the NAT selected Operators and organisations with
Region. It provides regular summaries of
promote awareness of NAT system safety, and with responsible for informing NAT ATS Provider States on
any other pertinent safety issues, either
directly or through the NAT SPG organisational mechanism.
Follow-up Action on Observed and Reported GNEs
Different administrative arrangements exist within those States participating in monitoring
programmes although follow-up action on GNEs should, in general terms, be as indicated in the following
For aircraft operating within MNPS Airspace:
the observing ATC unit should, if at all possible, inform the pilot of the aircraft concerned of the observed error and also that an error report will be processed; any comment made by the pilot at the time of notification should be recorded;
the Operators (including military) and any other relevant ATC units should be notified of the observed deviation, either directly by the observing ATC unit or by an agency designated by
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