Back in the 80s while boarding a Dan-Air 727 (all service vehicles now departed) front section, noticed and open access panel. Um I thought, maybe the F/O missed this on his walk around (before the service people departed?) so I brought this to the attention of cc. Two minutes later F/O leaves the f/d, down steps and has a looksie.
Now, this might have not had any detrimental effect on the safety of the a/c prior to take off, but it must have raised concern on the f/d as to the open access flap/hatch, forward/underside of the port wing. Might be a good idea that the walk around check would be more beneficial when service vehicles and support peoples have departed the vicinity of the a/c. Just a though.
Daz