Whether the item works is the least of your problems when it comes to military jets. Trust me, if it's UK-mil it's a bureaucratic nightmare (expensive) to develop software that can be proven to be of high-integrity. To reduce costs you use stuff that has been proven safe before (we still use 8051s and wire-wrap).

Put simply, if the pilot makes decisions on how to fly (in flight or on later analysis) based on an electronic piece of equipment, it'll have cost shitloads. This fact is why I want to get out of mil-aero in the UK; developing embedded soft/elec is mostly about jumping through hoops.