mishaps previously cited:
http://www.pprune.org/rumours-news/3...-finals-4.html
http://www.pprune.org/rumours-news/397678-jet-airways-check-pilot-pulls-cb-finals-4.html,
see message #76.
A related
factor, since the 1930's mysterious inflight upsets, has been the
VISITOR-in-cockpit, and sometimes
Visitor-in-seat (this goes back to deH86 upsets of the 1930's, and upset-breakup of B307 Stratoliner / 18Mar39). Lessons here are important for those operators who now are forced to [occasionally] employ a "visitor"
FA-in-cockpit to comply with "security" rules:
http://www.pprune.org/safety-crm-qa-...sekeeping.html