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Technology Supplements: DO-178C recognized that new software development methodologies may result in new issues. For example, Annex A now includes references to each activity as well as to each objective and Section 1.4, titled “How to Use This Document” reinforces the point that activities are a major part of the overall guidance.
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Objectives and Activities: DO-178C reinforced the point that, in order to fully understand the recommendations, the full body of this document should be considered. All such changes were made simply to make the document more precise they were not meant to change the original intent of DO-178B. Wording Improvements: DO-178C made wording improvements throughout the document. (Table A-9 #3)Ĭonsistent Terminology: DO-178C addressed DO-178B’s issues with the use of specific terms such as “guidance”, “guidelines”, “purpose”, “goal”, “objective” and “activity” by expanding the Glossary and changing the text accordingly so that the use of those specific terms was consistent throughout the document.
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Its purpose is to recognize a SELCAL signal intended specifically for the aircraft in which it is installed.
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It is used to receive and decode SELCAL signals made up of four combinations of the 32 tone frequencies defined in ARINC 714A and RTCA/DO-93A. SELCAL: The CSD-714 Mark 4 SELCAL decoder is an airborne, rack mounted, five channel, 32 tone decoder designed in accordance with ARINC 714A. It also computes the integrity of the PVT from the SBAS signal, if available. The primary function of NexNav G2S+ GNSSU is to compute the position, velocity of an aircraft and the precise time (PVT). Wide Area Augmentation System (WAAS) is one example of SBAS. NexNav G2S+: The NexNav G2S+ Global Navigation Satellite Sensor Unit (GNSSU) is a satellite sensor that utilizes the signals coming from Global Positioning System (GPS) satellite constellation, GLObal NAvigation Satellite System (GLONASS) and Satellite-Based Augmentation System (SBAS). BA-110 logs fault status information in its Non-volatile memory which can be later used for diagnostic purpose. The ARINC 429 data to CSDB Converter, which converts data from ARINC 429 format to CSDB format and RS-232 format as per the configuration mapper tables. The SBAS networks provide differential corrections. The GPS-SBAS receiver provides additional integrity by acquiring information from SBAS satellites that broadcast GPS health, integrity information and ionospheric corrections. It also performs Receiver Autonomous Integrity Monitoring (RAIM) of the navigation solution using the measurements from redundant GPS satellites. GPSB : The GPSB is a navigation sensor that can acquire and track GPS satellite signal and determines the position, velocity and time. It receives the aircraft and engine parameter information through A429 bus (example, from the Data Acquisition Unit (DAU)) and converts it to the graphical representation of the engine and aircraft parameters like EOP, EOT, TOT, OAT, N1, N2, NR etc. The Display Unit graphically represents various Aircraft and Engine Parameters. Configuration Module Unit is a microprocessor-based unit, which stores Aircraft Configuration Data (ACD) i.e., parameters related to different engine and aircraft configurations.
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Accord has worked on all the levels(A-E) of DO-178B/C.