This tool box or emergency kit will of course be limited by the amount of room you have. First you must remember that if you are dealing with a Rotax powered aircraft all of the nuts and bolts on the engine are sized METRIC.
Your aircraft if built in Canada or the U.S. will use AN hardware which is sized in standard 3/8", 7/16", 1/2", 9/16" etc. Thus you need to have socket and wrenches for both standard and metric sizes.
There are also two different styles of screw drivers in various sizes used on the Rotax line of engines. The carb sockets use a Phillips head screw driver, while clamps used on the Rotary valve tank hoses on the 582 are a blade screw driver. As are the clamps used on K & N airfilters which are generally used in our application.
Thus having a number of screwdrivers in a different lengths, sizes and styles is recommended. However because of our limited storage space it would be wise to try to take stock of the tools you actually do need versus carrying a lot of tools you will never use. Also many tools like screwdrivers are available with interchangeable bits which will cut down on space. Adjustable wrenches, and the vise grips should also be considered, but used ONLY when all other avenues have failed.
These tools also have to have a safe and SECURE storage container so that they are not moving around inside the plane. Home Depot, Canadian Tire, Sears and a variety of other outlets have a variety of small boxes designed specifically for this purpose. In many cases these can be bolted or secured directly to the inside of your plane. On the L'il Hustler we bolt it directly to the floor behind the pilot seat. This gives easy access, is out of the way, and is inside so that the tool box and it's contents are protected from the elements. There is nothing worse that reaching for a pair of pliers only to find they have rusted shut because of dampness. In cases where dampness is known to be a problem it might be wiser to spray the tools with storage oil, and put them in zip lock bags inside the tool box.
an interchangeable-bit screwdriver,
a pair of needle nose pliers
a pair of wire cutters
an adjustable wrench
a box cutter or Exacto knife
a small pair of locking
a pair of adjustable pliers
a set of Allen wrenches
a small socket set and ratchet with the necessary standard and metric sockets INCLUDING a spark plug socket.
a set of safety wire pliers
a crankshaft locking pin for the Rotax two stroke engines
a crankshaft locking pin for the Rotax 912 series of engines
a fan locking tool for air cooled engines
a roll or bundle of safety wire
a roll of black electrical tape
a roll of duct tape
a selection of nuts, bolts, washers, screws
a carburetor intake socket
a fan belt if air cooled
a first aid kit with at minimum Band Aids, tape and gauze