Hello Validator.
What r u doing in Turkey - one asks?
Your question is ambiguous. In that if you continue to fly after OEI (why continue?) and you fly at Max Con, then that figure is decided by the OEM to provide a margin of safety for the turbine temperature and blade centrifugal speeds. I don't believe it is based on engine output performance although this is a side effect.
You could, of course, pull to the 30sec and 2min OEI for those durations and then immediately back off to max con and then re-apply the 30sec and 2min once more - continuing with this cycle ad infinitum!
I'm not sure what you mean by "capability"?
Your second Q: Each OEM will lay down in the Maint Pubs, what checks must be carried out (if any) when applying and sustaining these engine/gearbox limits [30sec/2min/max cont]. Because at the end of the day you are stressing the turbine blades.
In some a/c, reaching and sustaining max cont or beyond in excess of the laid down limits, requires one to reject that entire engine
