NutLoose:
"Rigga,
They had a lot of problems with these at first as no US military helicopter previously had air conditioning fitted, so USA PLC ommited it from the Lakota even though the manufacturer advised against it, then suffered a lot of avionics failures due to overheating.."
Yep. I know. One of my Type Ratings is BK117-C2 (or EC145). And I don't work for military helicopter operators.
To fly one of these in a hot place is quite unbearable - sitting under all that "glass" isn't good in hot climes. We were quite surprised the US Army didn't order the AirCon as standard? The AirCon was a bit of a bugger getting used to at first but it was worth the effort of getting it. And at least one instrument was prone to overheat/seizing well before the spams got them (from my course notes!)