Converting an Automotive Engine for Aviation Use... no simple undertaking, particularily if you live in Germany. Here is a rough overview what is required by our federal aviation agency if you want to fly with your own engine conversion.


At first you have to proove that every deviation from the series-model is ~safe~.

Then, when the engine is finally hanging in front of the firewall (and has accomplished the break-in phase) an 150 hour (excludeing ground-run) evaluation phase follows. This phase includes test-runs on the ground and also in-flight-testing.


Initially there are six ground-runs required.

Each of these ground runs are devided into the eleven sections:

 Section  Duration [min]  Mode of Operation
 1  5  Start-Up and Warmup
 2  5  Takeoff Power
 3  5  Cooling Run (Idle Speed)
 4  5  Takeoff Power
 5  5  Cooling Run (Idle Speed)
 6  5  Takeoff Power
 7  5  Cooling Run (Idle Speed)
 8  15  75% Power
 9  5  Cooling Run (Idle Speed)
 10  60  Max. Power
 11  5  Cooling Run (Idle Speed) ans shut-Down

After each ground-run static thrust has to be measured taking the following measurements:

The first measurement is to be taken at 50% max.power, then measuring at increasing steps of 200 RPMs until max takeoff power.

When ground-runs are completed, the engine has to be completely disassembled and all parts have to be checked for fatigue fialures.

The in-flight evaluation is structured as follows: