Home' RTCA Documents for Review : DO-257toRevB_FRAC Contents © 2018, RTCA, Inc.
PURPOSE AND SCOPE
This document contains minimum operational performance standards (MOPS) for the
graphical depiction of navigation information on electronic map displays (EMDs) used for
flight crew awareness of the aircraft/ownship position relative to other items depicted on
the EMD. The EMD is intended to support, but not replace, the navigation and guidance
information presented on the primary flight displays. This document includes requirements
for electronic map displays depicting the plan view (in-flight), airport map (surface), and
vertical (profile) information.
Navigation information, as used in this document, is information intended to be used to
assist the pilot to identify the aircraft’s position with respect to flight plans, fixes,
and navaids (such as VORs, NDBs, etc.) as well as items on the airport surface. The
requirements in this MOPS have been updated to support RNP systems, specifically when
the plan view map is displayed and used to display defined paths generated by the RNP
system. Additionally, this MOPS assumes no changes to operational requirements. These
standards may be applied to moving map displays irrespective of the display technology
used (see definitions in Section 1.8). These standards specify EMD characteristics that
should be useful to designers, manufacturers, installers, and users of the EMD.
Compliance with these standards is recommended as one means of assuring that the
EMD will perform its intended function(s) (see Intended Function(s) in Section 1.4)
satisfactorily under all conditions normally encountered in routine aeronautical operations.
Any regulatory application of these standards is the sole responsibility of the appropriate
Section 1.0 provides information on purpose and scope needed to understand the
rationale for EMD characteristics and standards stated in the remaining sections. It
describes typical EMD applications and operational goals as well as establishes the basis
for the standards stated in Sections 2.0 through 3.0. Definitions and assumptions essential
to proper understanding of this document are also provided in this section.
Section 2.0 contains general guidance and minimum performance standards for the EMD.
These standards specify the required performance under standard operating and
environmental conditions. Section 2.1 contains requirements and general guidance that
may not have associated test procedures. Section 2.1 and 2.2 provide requirements for
all EMDs addressed in this document, including the plan view map, airport map, and
vertical situation displays (VSD). Requirements in Section 2.3 apply to the plan view map
display. Requirements in Section 2.4 apply only to airport map displays. Requirements in
Section 2.5 apply only to the VSD. Also included are recommended bench test procedures
necessary to demonstrate EMD compliance with the stated minimums.
Section 3.0 describes manufacturer’s considerations for installed equipment performance
and references source documents for installation guidance.
Section 4.0 describes the operational performance characteristics for equipment
installations and the conditions that will assure the EMD user that operations can be
conducted safely and reliably in the expected operational environment.
Appendix A is a list of abbreviations recommended for use with EMDs and associated
documents. Appendix B contains a glossary of terms and acronyms, while Appendix C
contains a bibliography and a list of all references cited in this document. Appendix D
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