scope:

INTRODUCTION

The minimum performance requirements specified herein are designed to ensure, by means of bench tests, that aircraft equipment certified as complying with them will be compatible with ICAO Circular 11I-AN/83 entitled "Guidance material on Area Navigation", and will enable the computing equipment to meet the requirements of EUROCAE MOPR ED-39, "Minimum Operational Performance Requirements for Airborne Area Navigation Systems, based on two DME as sensors".

Navigation in a horizontal plane - also known as 2-D navigation - Is considered in this document.

Suitable test procedures to demonstrate compliance with these requirements have been formulated and are included in Chapter 5. Alternative test procedures providing equivalent assurance may be used, by agreement with the appropriate authorities.

The minimum performance requirements specified herein are applicable to computers based on two DME as sensors; a means of resolving positional ambiguities, e.g. signals from an additional sensor such as VOR or a third DME, are also required. Alternatively, the sensor requirement may be satisfied by a single frequency scanning DME interrogator. Computers capable of using other sensors such as inertial systems, or air data and heading, to enhance their performance and also having a mode in which two DME and an ambiguity-resolving sensor are the sole inputs shall meet the requirements when in that mode.

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

Where reference is made to other documents, use of their latest issue is implied.