Re: I always feel safer in Boeings than Airbus.
<<Logically you should always fly on Airbus 340s then as they are accident free.>>
That's probably because I designed part of the A340 ;)
Actually it was only a small part - one of the chips in the LGCIU, the module which makes the wheels go up and down. It was almost 20 years ago, but I remember it well. Anything to do with aircraft is very bureaucratic, with mountains of paperwork and testing for the tiniest part (as it should be).
The undercarriage controller on a big jet is actually quite complex, with multiple operating modes. It has to cope with a complex series of operations, opening and closing doors in the right sequence, tilting the wheel bogies at just the right time to squeeze them into the allocated space, etc. You have the added complication that the pilot sometimes chooses to not use all the wheels when lightly loaded. Then you have the possibility that, with the wheels half extended, or half retracted, he may change his mind and reverse the process, requiring the sequence to be worked backwards from wherever it's got to. You have various maintenance modes where, with the aircraft on a set of over-sized axle stands, you want to extend or retract wheels one at a time (but make sure that never happens at any other time!). To add to the complexity, the module also had to work with the A330 and A320.
I must have worked on that IC for almost two years, and there was still work being done on it when I left at the end of my contract. A year or so later, I heard that an A340 had done a wheels-up landing at Sydney (so they're not entirely accident-free). Fortunately for me, this was found to be the result of a mechanical fault.