PC2(e)
I’m not sure that you mean performance class two‘enhanced’. PC2(e) was a term which meant PC2 with exposure period during which a safe forced landing is not possible.
There is a good explanation of the concept in a closed JAA NPA. Try googling ‘JAA NPA OPS 38’. This has been lifted by EASA and is included in EASA NPA 2009-2B, for which a comment response document following the first round of consultation is awaited.