Sure, I get that it's the exception, but it still happens, and WHEN it happens the penalty is pretty severe. Hence my question about anything that I can do to prevent it. Thanks for the replyThey are not really frequent at all compared to the number of problem-free aircraft out there. This is a problem-solving forum, and so people post problems here. If everyone posted about every uneventful flight that they made then the problematic flights would be lost in the noise.