Abstract
At present, COTS (Commercial-Off-Shelf microprocessors or microcontrollers are widely used in civil aircraft. The read-only, unmodifiable micro code is often embedded in these equipment/devices for customers to use when they leave the factory. It is difficult for civil aircraft manufacturerrs or suppliers to fully check and verify such codes when they use them. The airworthiness authorities also pay more attention to this problem. This paper takes the built-in software of a civil aircraft microcontroller chip as an example, The feasible airworthiness compliance methods recommended for civil aircraft are studied to meet the airworthiness regulations of civil aircraft and the objectives of RTCA DO-178B/C.
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