Originally Posted by
WEACLRS
In 2004 in the SAAB I had a false loc/gs capture going into PWM. We were maybe 6 miles south of the ILS 11, due south of AIMME, at about 5000 ft day VFR. The autopilot was engaged and the approach mode armed. The loc and gs captured. Chasing the signals the aircraft instantly and suddenly pitched down about 10 degrees, maybe a little more, and banked to the right. I clicked off the a/p and recovered. It was disconcerting to say the least.
Ya... scary stuff. A friend of mine was flying the Brasilia when he had the autopilot start aggressively banking and pitching the aircraft. They had to pull the circuit breakers to get control. After they landed, the mechanic pulled the autopilot panel and found soda had been spilled on it! In other words, there are a lot of possibilities.