For those of you that are new to digital flight instruments, we have collected a small glossary with the most frequently used terms:
|AHRS||AHRS is short for Attitude Heading Reference System. It consists of one or more cases with multiple sensors that provide the EFIS/PFD with information about the aircraft's heading and attitude (pitch, yaw).|
|AD/AHRS||An AD/AHRS is an Air Data Attitude Heading Reference System. It's like an AHRS, but with some gadgets added to measure temperature, airspeed and altitude (through analog/digital converters that make the static port and pitot port information available to the computer).|
|COTS||COTS is an acronym for 'commercial, of the shelf' - as opposed to 'proprietary'. Not really a glass cockpit definition percé, it describes the usage of common commercially available components; applicable both to hard- and software.|
EFIS is an acronym for 'Electronic Flight Information System', sometimes it's also called an 'Electronic Flight Instrument System'.
According to Wikipedia, an EFIS is a flight deck instrument display system in which the display technology used is elecronic rather than electromechanical.
|MEMS||MEMS is short for "Micro-Electro-Mechanical-Systems", which describes the (almost nano-) technology that made low cost 3-axis sensors - those that are part of an AHRS/ADAHRS - a reality.|
|PFD||PFD is an acronym for 'Primary Flight Display'. A PFD is the screen that houses the ADI (the Attitude Director Indicator) or - in a somewhat less feature laden guise - the artificial horizon.|
|Simulator||From a presentation point of view, the downloadable oc_EFIS/PFD Simulator is almost the real thing, less the modules that are needed to communicate with AD/AHRS- & GPS-devices. Also, code modules that validate and normalize the various data input streams are not included either.|