Turin, sorry but they don't safety critical items are control rods flight, controls etc. Not engine cowls, it is perhaps a recomendation or a maintenance manual requirement but is NOT a mandated requirement. I have been a line engineer for over 35 years and have never seen a duolicate inspection required for an engine cowl. The main reason that the safety critical item is rarely required is so as not to degrade the check and leave it for items that can affect the aircraft performance/handling.