Tried the rudder trim on a 767-300 last night, and to say the least, it was very inconclusive.
The nose wheel tyres were on a smooth metal plate, so I would have imagined it would have moved more easily than on tarmac. One Center hydraulic pump was switched on and the trim was set to max.
It was very difficult to tell if the nosewheel was moving at all. A few times it looked like it moved a fraction of a degree, but you couldn't be sure your eyes were playing tricks on you. Either one pump was having problems moving the rudder and the nosewheel steering or the movement of the nose wheel was so slow and limited, it would not present any kind of danger.
At one point, I put my hand on one of the actuator rams and I felt it twitch, but that may have been when the hydraulics were switched off.
Will try again with two pumps on next time... or try on an aircraft with more trim authority (the 767-300 only has about 65% trim authority).
Rgds.
NSEU
Last edited by NSEU; 31st May 2004 at 04:14.