Home' RTCA Documents for Review : DO-253D_Change1_FRAC Contents 1
DO-253D Change 1
© 2019 RTCA, Inc.
PURPOSE AND SCOPE
This document contains minimum operational performance standards (MOPS) for airborne
navigation equipment using the Global Positioning System (GPS) augmented by the Local
Area Augmentation System (LAAS). These standards are partially derived from the
requirements specified in RTCA/DO-245(), Minimum Aviation System Performance
Standards (MASPS) for the Local Area Augmentation System (LAAS). Additional
requirements have been derived by analysis of operational intent and direct allocation of
performance requirements between airborne and ground systems. Throughout this
document, the term “LAAS” is used as a generic reference to ground-based augmentation
systems (GBAS) as defined by the International Civil Aviation Organization (ICAO), as
the requirements in this standard are intended to comply with the ICAO Standards and
Recommended Practices (SARPs) for the GBAS aircraft element.
Note: This MOPS was developed in conjunction with the ICAO Annex 10 Volume I
SARPs (through Amendment 92). The shorter notation “ICAO Annex 10” is used
in this document to refer to the SARPs.
The standards in this document define minimum performance requirements, functions and
features for LAAS airborne equipment to support multiple types of service that are intended
to support precision approach operations and guided takeoff for all weather minimums.
This standard also covers the computation and output of position, velocity, and time (PVT)
to support area navigation and other applications.
Note: The requirements for area navigation systems continue to evolve. Applicable
standards include RTCA/DO-236(), RTCA/DO-229(), RTCA/DO-187() [as
amended by TSO-C115()] and RTCA/DO-316().
Compliance with these standards by manufacturers, installers and users is recommended
as a means of assuring that the equipment will satisfactorily perform its intended functions
under conditions encountered in routine aeronautical operations.
The regulatory application of these standards is the responsibility of appropriate
government agencies. The Federal Aviation Administration (FAA) and the European
Aviation Safety Agency (EASA) have published two Technical Standard Orders (TSO) for
GPS/LAAS equipment, one for the LAAS VHF Data Broadcast (VDB) receiver function
(TSO/ETSO-C162) and another for the LAAS Position And Navigation (PAN) function
(TSO/ETSO-C161). These TSOs and ETSOs do not currently address GBAS Approach
Service Type D (GAST D). It is expected that regulators will use this MOPS for
authorizations with GAST D.
The word "equipment", as used in this document, includes all components or units
necessary (as determined by the equipment manufacturer or installer) to properly perform
its intended function.
In this document, the term “shall” is used to indicate requirements. An approved design
would comply with every requirement, which can be assured by inspection, test, analysis,
or demonstration. The term “must” is used to identify items which are important but are
either duplicated somewhere else in the document as a “shall”, or are considered to be
outside the scope of this document. The term “should” is used to denote a recommendation
that would improve the LAAS equipment, but does not constitute a minimum requirement.
This document facilitates traceability by identifying each specific requirement with a
requirement designator. The notation “[LAAS-xxx]”, where xxx is a three-digit number,
identifies each specific requirement for traceability purposes.
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