- Instead of combination wrenches, consider spending more for gear wrench with the ratcheting box end that can be flexed to approx 45 degrees each way. If you ever really get into it (especially on something like an owner assist annual) these are a must because there are so many damned fasteners in hard to reach places. You can also approach this with a box full of socktet extensions, joints an crows feet, but I will leave those for my mechanic's tool box.
- If you ever do any panel work: a set of midget wrenches
- Ratcheting screwdriver kit (nothing fancy here, again sears makes a cheap one. This lets you get at screws where no ordinary screwdriver would go
- The common screwdrivers (#2 philips obviously), and then separately I carry a combination screwdriver (removable bits) that also has a flexible head you can adjust (again, sears)
The common theme with the above compared to the Mike Busch list, in case you haven't already figured it out, is tools to work on fasteners in tight and or out of the way places. This is a fact of life on the Mooney. Even if you don't use these on your own, if you do an owner assista annual or are directed to do something under supervision it will make the difference between hunting to borrow your mechanics tools and having your own readily available.
- Safety wire pliers, safety wire, duct tape, tie wraps (of course!)
- Simple socket set, 3/8 or 1/4" drive. Don't need to go too crazy on all the different sizes
- Fasteners: non-structural fasteners often work loose and fall off. I have assembled a bag of the common ones used in fairings, interior plastic pieces, inspection panels, etc. If one gets stripped, departs the airplane, etc, I can replace it.
- Spark plug service: Spark plug socket ( I found a deep socket craftsman and bought it by itself.. much less expensive than the champion one and it does the job fine), along with a 1/2 to 3/8 adapter, spark plug washers ready to go, spark plug gap tool, and one or two spare plug. Also, this is slightly embarassing because its so darned big, but I carry a torque wrench with me. this is because spark plug R&R can be a common occurance, and I don't trust myself to have my 'arm' be an accurate torque wrench.