EUROCAE ED-27 PDF

INTRODUCTION

These Minimum Operational Performance Requirements cover the operation of a complete airborne area navigation system, including aerials, interconnections, sensors, computers, controls, and displays.

The principle sensor combination considered is VOR/DME, but other combinations such as DME/DMK and VOR/VOR may be used.

These 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 throe Appendices contain :

- mathematical expressions used in deriving the limits.

- justification for the limit values quoted,

- calculation of parameters using spherical geometry.

It is necessary that the elements of the system should have been indivi¬dually approved, using Minimum Performance Specifications or equivalent documents. For this purpose the principle of a limited sample of tests is adopted. The assumption is made that the behaviour of the system throughout its whole performance envelope is satisfactory, provided that satisfactory performance of designated parts of the system is shown to exist under certain typical conditions. From the results of these tests it may reasonably be concluded that the performance under other conditions is at a similar level of satisfaction.

In endeavouring to fulfill this purpose, the MOPR may be more extensive than perhaps is strictly necessary.

An indication of the performance which may be expected in the future will be found in Appendix B. This is intended as a guide for those using these MOPR for planning purposes.

The Minimum Operational Performance Requirements specified herein are designed to ensure that aircraft equipment certificated to them will be compatible with the recommendations of ICAO Circular 111-AN/83, entitled "Guidance Material on Area Navigation". In certain cases a margin of performance which engineering experience has shown to be desirable 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.

The flight tests described in this document assume coupling of the RNAV system to the autopilot.

The MOPR has 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.