When JAARS got their DC-3, some military moron had upgraded to a somewhat Super DC-3 configuration. Joke was, The Donald made it so safe, three ways to get the gear down, and if all failed, shut down both engines, co-pilot cranked until one blade straight up, and you could land it on wheels and the only damage was the RDF antenna under the nose. The Super added clamshell doors to the gear, eliminating that option. Wycliffe removed them.
They did a full rebuild, effectively to zero hours..was at the time the freshest DC-3 in the world.
You've never lived until you are at WAY over 10,000 feet over the Andes, and at 10K the attendant passes out surgical tubing plugged into ports over your head..stick it in your mouth and breath oxygen.
Seriously.
Flew the twin Evangel, or a Helio to Villavicencio, then the DC-3 to Bogota.
But then they started flying the 3 into Lomalinda...dirt and grass strip.
Fun stuff.
I helped a Colombian crew with a load of cattle (offloaded while we worked) change out a cracked jug in the temperature, sunshine, and humidity.
THAT was a trip.
If you have ever had or used the multiple-bend wrench on a GM V-8 to get to the distributor clamp bolt...same idea for the back and side nuts holding the jug to the crankcase...just ten times longer and bigger.
Then carrying the jug down the wobbly ladder.