HL
usually because owners whinge about using hours/fuel etc, without realising that an a/c can come out of the shed after maintenance with a lot of the same snags it had before-- engineers can`t fix things they don`t know about, and everyone carries snags on a day to day basis.Then when a maintenance flight is done and the discrepancies are noted ,it causes further delay . T hats why a pre -maintenance test should be performed; it also standardises everything, if it`s done by a small team.