Peter wrote:
People have also built LED modules which replace the fluorescent modules on King avionics. Just emulating the display module is a fairly “surgical” approach. A firm at EGHH used these and then, some years ago, told me they can’t fit them anymore because EASA would not allow it.
It is possible to get these approved by EASA as a minor change, but there will be big fees and lots of paperwork involved.
That’s quite an amazing statement!
Probably the reason is that there is no straightforward approval system for avionics, or actually anything involving electronics. The authorities just do not understand it. I am told that one big concession in CS-STAN is that anything described in FAA AC 41.13-1 needs no approval at all, but that stuff is basically metal bashing. For some “electronics” you need a US DER or EASA Part 21, no matter how trivial it is.
