A lot as been said so far .
It is 100% true good experienced enginners are needed...also take care of spares and make sure you can track their origin (specialy on Alouette 2)
Artouste and Astazou engines are very reliable, but since a few years they have been experiencing failures that never happened before, as airframes, they are becoming old and the overhauling personal is coming of "another generation"
By the way the yaw damper under the cockpit floor is called "houdaille" (not sure of the spelling)
But what a fun to fly a long line in a Lama without doors !!!!