while this is certainly a sad situation, the bigger question is:
how bad is security and preflight inspections that people have access to the plane...this person could have easily put a bomb onboard as himself.
My point exactly, but also - assuming the unfortunate individual had got himself into the wheel well at an out-station, how was he not detected when the a/c got back to base?
It's not only the getting through the perimeter fence I'm asking about, but also the checks at subsequent stations. By all concerned.