From the Air Force Times:
The most expensive crash in Air Force history â€” the $1.4 billion loss of a B-2 Spirit bomber Feb. 23 â€” was caused by water clogging aircraft sensors, according to an Air Combat Command report issued Thursday.
Moisture in three of the 24 sensors that feed information into the bomberâ€™s computer system caused the sensors to send bad information about the planeâ€™s speed and altitude, and how far up or down the bomberâ€™s nose was pointed.
As the jet took off from Andersen Air Force Base, Guam, the onboard computer thought the B-2 was pointed downward, causing the nose to jerk suddenly upward.
The two pilots couldnâ€™t regain control of the bomber and as the left wing struck the runway, the pilots safely ejected.