Engine burping
During preflight of an aircraft using the Rotax912UL engine, it requires the engine to be burped. Why is it?
1. It's only to return the oil back to the oil tank so that proper oil level can be checked?
2. Or is it also to circulate the and remove air from the oil system to facilitate easier starting?
Also does burping apply to all dry sump piston engines or just this particular Rotax model?
Cheers!