I worked with a supposed genius in a hot environment. He could not understand that the VNE chart for a 212 was based on DA. Then he bitched about the 87kt vne I calculated. I asked him if he actualy new what the TAS was at 6000 feet at 38C at 87 kts IAS...101kts. TAS. He looked like a deer in the headlights..he just didn't understand. He just hated seeing IAS less than 100 KTS... some macho thing ...Those VNE numbers may not be accurate ..long time ago..but I guess my message is that VNE IAS goes down with DA but your TAS does not go down that much.
212 man ...you are using common sense again ...stop that!
Sometimes we would operate in a -20...-40C environment in the winter and then change to +30c for the summer. Checking outo rpm was a normal spring/fall check event amongst other checks. Especially if we changed from operating from bases at 1000ASL to a mountain environment where you were starting from 5000ASL.