The dc3s operated by Malayan Airways in the 50's had fixed cowlings - due to the high ambient temperatures in the area movable cowl flaps would have rarely been closed. I will try to find photographs that I took as a boy.
That's what I thought may have been the case here as the current flying examples have come from Australia... However there still are some which have been here most of their lives with the fixed mod...
Here are some old photos
And one with normal setup to show difference...
