Nat doc 001 Guidance and Information Material Concerning

North Atlantic Guidance Material
1-3 7
th
Edition
a) continuously provides indications to the flight crew of adherence to or departure from track to the required degree of accuracy at any point along that track and b) has been authorised by the State of the Operator or the State of Registry responsible for
MNPS operations.
1.4.2 Since its inception in 1965, the NAT SPG has been developing methods and procedures allied to the safe separation between aircraft in the NAT Region. In 1975, the NAT SPG proposed establishing an MNPS to enable a reduction in lateral separation minima for all suitably equipped aircraft. The rationale and foundation for MNPS is based on a mathematical model that expresses a relationship between collision risk and separation.
1.4.3 The integrity of MNPS Airspace is maintained by a series of procedures dealing with the approval and operation of navigation equipment, plus the continuous monitoring of aircraft navigation accuracy within the MNPS Airspace. It is implicit in the concept of MNPS and essential to the application of the lateral separation minimum that all operations in MNPS Airspace, be they by Public Transport, International General Aviation (IGA) or State aircraft, achieve the highest standards of navigation performance accuracy.
1.4.4 An aircraft which is approved for operations within NAT MNPS Airspace shall have a navigation performance capability such that a) the standard deviation of lateral track errors shall be less than 6.3 NM (11.7 km b) the proportion of total flight time spent by the aircraft 30 NM (55.6 km) or more off the cleared track shall be less than 5.3 x 10
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; c) the proportion of total flight time spent by the aircraft between 50 and 70 NM (92.6 and
129.6 km) off the cleared track shall be less than 13 x 10
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