I seem to remember that the Phantom nosewheel steering system was susceptible to water ingress into the position feedback potentiometer on the noseleg. It was in a fairly exposed position, likely to get water thrown up at it by the nosewheels. A spurious feedback signal might command the steering motor in either direction with no input from the pilot, often with exciting results. By the time the fault is investigated the water may have evaporated or moved and it's NFF as a result. Then it's that tricky decision, do you change a component or leave everything as is?
Last edited by walbut; 8th Oct 2012 at 16:30.