Those of you familiar with smaller commercial aircraft will recognise the term "Check A" for the Daily inspection which is different from the pre-flight. All aircraft require a pre-flight that can be accomplished by the pilot or other qualified person without a CRS being issued (unless there are maintenance items on the pre-flight and some pilots in some types of operation can be issued with a Part 145 or M subpart F authorisation - this is not pilot/owner maintenance, by the way. This is an authorisation issued by the AMO. Some operations can allow pilots to be issued with an authorisation by the aMO to certify the Daily/Check "A". Pilot/owner maintenance is available for non-commercial < 2730 kg)).
Some aircraft flip between commercial and non-commercial ops and some pilots forget to use the technical log or to accomplish the tasks required for commercial ops.
