Aircraft Operations

Chapter 5
GENERAL INFORMATION FOR GROUND-BASED
AUGMENTATION SYSTEM (GBAS)
5.1 GENERAL CRITERIA
5.1.1 GBAS receiver
A GBAS receiver is a type of GNSS avionics that at least meets requirements for a GBAS receiver in Annex 10,
Volume I, and specifications of RTCA DO-253A and DO-246B as amended by the respective FAA TSO (or
equivalent).
5.1.2 GBAS avionics requirements
Minimum GBAS avionics requirements do not include provisions for RNAV. GBAS may provide a position, velocity
and time (PVT) vector output. When the GBAS ground station supports this service, it is called GBAS positioning
service. The PVT vector is intended to be used as input to existing on-board navigation equipment. However, there is
no requirement that the aircraft be RNAV-equipped. There is no requirement that GBAS avionics provide missed
approach guidance. Minimum display functionality is an ILS look-alike and includes display of course deviation
indications, vertical deviation indications, distance to threshold information, and failure flags. Without on-board
navigation equipment, the pilot is not provided with position and navigation information. Only guidance information
relative to the final approach course and glide path is provided.
5.1.3 A more detailed description of GBAS and the performance levels supported by GBAS is provided in
Annex 10, Volume I, Attachment D, Section 7, and the Global Navigation Satellite System (GNSS) Manual
(Doc 9849).
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II-1-5-1 23/11/06