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Old 18th May 2019, 06:18
  #50 (permalink)  
Join Date: May 1999
Location: somewhere out there
Posts: 18
Originally Posted by fgrieu View Post
Looks like the stepper motor for the analog hands looses steps. The strong magnetic field theory would make some sense if there was such a source, but I can think of none. If the watch it still waterproof, I doubt it could be the slightly lower cabin pressure, or hygrometry. Flying high measurably increases errors in computer DRAM due to single event upsets from cosmic rays, but I doubt that it could have some effect on the driver of a stepper. Remains temperature (cold air), position, vibration. Stick shaker :-) ?

[I was given a similar electronic+mechanic watch from another Swiss brand. I experienced two different reliability issues. After 6 months the handle for minutes suddenly stopped moving at all. On the replacement (under warranty), a 4mm spot developed on the side of the digital display, with the same contrast as the digits. I'm living with that later defect. Never had troubles related to flying (as a PAX) with any other watch].
Thanks for the info, I also doubt there is such a strong magnetic field in the flight deck that would affect the stepper motor so much. Interestingly it losses more time on the 777 flights than on the 787 which is very strange.
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