Reference the last message. WOK you are totally correct with regards to the 737 'fixes'. Having worked in aircraft maintenance for a number of years and holding an approval on 737 I must admit the engineering solution to this problem to me falls short of that required. Scheduled function checks of the rudder system are carried out periodically yet this really is unconvincing considering that researchers have only been able to reproduce this failure on a very very small number of occasions. So I don't know what makes them think that it will show itself on a maintenance check. The PCU's are also sent away for a check of the secondary slide yet again this is only a check of the slide in its current state. Other aircraft do not suffer with this problem so what prevented a total redesign of the PCU. Maybe life does have a price!!!