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system operational status is new, while the ability to combine groups of sensors into an overall aircraft status is newer still. RTCA work group SC-236 and EUROCAE WG-79, Standards for Wireless Avionics Intra-Communication System (WAIC) has been developing recommendations for some time. The intention is to create and use WAIC devices operating in the FCC assigned band of 42004400 MHz, ironically also used by aircraft radar altimeter systems. Apart from recommendations on avoiding interference with radar altimeters, the standards recently issued as DO378, provide a permissible power allowance (flux density) and other criteria. Other standards covering passive RFID devices include SAE AS5678 (and newer AS6023), along with ATA’s Spec2000. Active RFIDs will locally transmit their data to a hub. Multiple hubs will combine the data through a central controller, and add to the aircraft’s overall digital signal, sent to the remote pilot and cloudbased avionics for processing. This level of autonomous and ‘virtual live sensing and monitoring’ allows for the proper commands in response to any aircraft deficiency. All in all, an aircraft of the future, working as a closed loop system via its remote avionic cloud, will function fast and accurately because www.AVBUYER.com
of sensors like RFIDs. It is important to achieve a significant degree of sensing and response right at each aircraft subassembly. This is achieved by the wireless communication of status from the source and all along the aircraft’s monitoring pipeline. This will minimize the wiring, connectors and points of failure. It also reduces weight and takes less time to push and pull data around the total circuit. Just as we route internet data, and use Bluetooth in place of handsets, in modern cabins we can rapidly transfer wireless data from aircraft components to ‘high density collectors’ that modify the data to a form that is suitable for inter-satellite communication.
In Summary
Having wrapped up the Primary Enabling Electronic Technology for a future aircraft here, building from the newer technologies in use by drones and planned for e-VTOL, our next article will review Primary Existing Advancing Electronic Technologies (Avionics). Avionics implies the use of these technologies in our business jets of today. However, they will later morph into more advanced technologies, while in some cases, merging with those previously defined as primary enabling. T AVBUYER MAGAZINE Vol 23 Issue 10 2019
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