EUROCAE ED-74 PDF

PURPOSE AND SCOPE

The Minimum Operational Performance Specifications specified herein are designed to ensure that airborne receiving equipment approved as complying with them, will be compatible with the ICAO Standards and Recommended Practices in respect of Microwave Landing System (MLS) (up to and including amendment 68 and AWOP/12/13) and Instrument Landing System (ILS) localiser and guidepath functions.

The minimum Operational performance specification specifies the particular operational performance requirements applicable to airborne receiving systems with both ILS and MLS functions incorporated within a single equipment. The requirements of this document shall be met by a combined ILS.MLS receiver when operating in either one of two mutually exclusive operating modes:

a. MLS Mode

b. ILS Mode

In addition to the requirements of this document, a combined ILS.MLS receiver shall fully meet the minimum operational performance requirements of EUROCAE MLS and ILS MOPS when operating in the appropriate mode. Several specific requirements of ED-36A (MLS) and ED-46B/47b (ILS) are referenced in this document. A receiver meeting the requirements of this document shall not be capable of operating in both ILS and MLS modes simultaneously.

Mandatory clauses are noted by "shall".

Environmental test requirements have been specified in respect of the parameters which may be particularly susceptible to the effects of environment. Although this document provides a single minimum performance standard for receivers, several alternative environmental categories, as specified in EURCAD ED-14C/RTCA DO-160C may exist. Those categories applicable to the conditions over which the equipment is declared to operate shall be applicable.

Demonstration of compliance with certain of the requirements of this specification may involve somewhat complex test procedures, e.g. where a scalloping of input signal is required or where performance in the presence of interfering signals is to be demonstrated. Suitable test procedures in respect of these requirements are contained in the appropriate EUROCAE MOPS and are referenced in Chapter 5. Alternative procedures providing equivalent integrity may be used.

This document provides minimum performance specifications for the airborne portion of the MLS and ILS. Should the MLS and ILS functions be incorporated into multifunction equipment with additional navigation functions, the requirements of this specification must be met when operating as an MLS or ILS receiver. The appropriate EUROCAE MOPS shall be used to define the operational performance of the additional function(s) to be incorporated.

This minimum specification does not require the provision of guidance information decoded from the MLS back azimuth ground system. The receiver must be capable of providing all azimuth is provided in the ground installation.