Very concerned here. It was only from this bulletin that we found that two of our machines never even had the spring fitted, even though the ground school was still mentioning it! If you are flying a 139 above S/N 31067, there never was a centering spring fitted. I would rather they redesigned the spring if it is giving problems, and then retrofit the spring to ALL machines.
How about the BT for the cockpit windows? Anybody else not happy with the softness of the new seals, and the fact that it only has a filler wedge on one side?