Engineer who signed Pre-Flight complete-Fail, CM who did (did not) do walk around-Fail-or possibly procedures leading to them to expect to see Pitot Covers-then it should be like a steering bypass pin check-visual sighting required!, Pushback crew-Fail, CM1 and CM2 speed check during Take-off roll-Fail. We are all familiar with Swiss Cheese but this is beyond comprehension.
