And the sensors cannot be completely sealed from the outside. After all, if they're completely sealed, how do they sense?
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This was a sensor that detects the position of the aircraft by comparison to a horizon or something like that.
The actual sensor could be waterproofed, while the sensing detector could still be exposed to whatever it is sensing. If humidity is a problem with the sensing detector, then there should be a way to prevent it from getting wet, or a way to dry it off.
Being as the survival of the B-2 depends on these sensors, they need to be modified. Aircraft on a planet mostly covered by water should be better able to deal with humidity.
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Odd that the Air Force can't do a better job.
The Air Force did not actually build the plane. Boeing or Lockheed need to do a better job. The Air Force perhaps should hire more qulaified quality control experts. Perhaps there is some officer in the avionics department saying right now "I TOLD them that this would happen, but the fools didn't listen!", and when he told them, some call between a Congressman and his superiors got the thing past inspection years ago.
I imagine that this plane was not under warranty, so we get to pick up the tab for said incompetent aircraft.