Working on the midnight shift at the airlines we would get the old G1 Grummans ready for the day's flights. A gravy job was to lube the driveshaft for the compressor that was driven off the accessory gearcase. It took about a whole shift sitting on top of the big old Rolls Royce Dart turboshafts, swinging an 11.5-foot Dowty Rotol prop.
When a new guy did it, someone would likely set a spare driveshaft retainer clip amongst the tools and stuff he had used so we could see his reaction thinking he had left it out. It was an awful feeling, knowing the airplane wasn't going to make line and it was my fault. Then after getting ready to yard the cowling back off, they would have a good laugh. It was hilarious. I could hardly wait to do it to someone else.
