General Discussion

Might not be available from the ACME electronics or is something that can be made with a 3D printer.
There's also a practice in Congress keeping some military manufacturing factories open to maintain parts and knowledge on how to make tanks, planes, ect that won't fail in combat, because the Armed forces have been seriously burned by Marketeers trying to claim some technology was far more advanced or rugged than it actually was.
Needless to say, a $15 switch and knob assembly engineered to household appliance specs will fail in a normal helicopter, let alone a Blackhawk helicopter.