scope:

INTRODUCTION

These Minimum Operational Performance Requirements cover the operation of an airborne area navigation (RNAV) system or lateral navigation elements of a Flight Management System (FMS), including aerials, interconnections, sensors, computers, controls, and displays.

The principle sensor combination considered is DME/DME but other combinations such as VOR/DME may be used in a reversionary mode. These requirements (MOPR) are intended:

(a) as a guide to limited ground and air tests to check the system installed in the aircraft, and

(b) to assist in formal approval of the Installed system.

This document therefore considers:

- broad design requirements,

- detailed requirements, quantitative and qualitative,

- means of compliance.

The three Appendices contain:

- mathematical expressions used in deriving the limits,

- justification for the limit values quoted,

- compliance with the future European Minimum Navigation Performance Specification (MNPS).

The Minimum Operational Performance Requirements specified herein are designed to ensure that aircraft equipment certificated to them will be compatible with the recommend¬ations of ICAO Circular 111-AN/83, entitled "Guidance Material on Area Navigation". Where engineering experience has shown it to be desirable, a margin of performance has been provided.

The performance limits specified hereafter may not be achieved in all the RNAV systems in use at the date of the publication of this document. They are regarded as values to be achieved by future systems, and may become mandatory at dates to be specified by the appropriate authorities.

These requirements have been written in a form which will enable them to be used for a long time in the future, even when the ATC environment has changed, by merely adding or changing Appendices. Therefore, this document may be more extensive than is strictly necessary.

Mandatory clauses are denoted by the use of the word "shall".