JW 411. I am a retired FE and in a former life the captain did a walk around as well. That was 3 inspections on a turnaround or preflight. On only a couple of occasions the captain discovered something I had missed. That is why we did proper inspections. Sure, I was embarrassed but we looked after each other and worked as a team. It is very easy to be distracted and miss something. They must be really talented these young fellows to be able to do it all in 25 minutes.