That's the problem SAS, the CHC one had and the Bond one hadn't and yet they apparently had the same corrosion failure but one caused by a bad angle shamfer in a plug hole and one caused by sludge, all manifesting itself on one shaft.
Part of the explanation is that some of the stresses on the shaft were underestimated at certification, but this is not "believed to be a major factor"
Management and passengers (many of whom are non aircraft engineers) say "let's just wait for the new shaft".
Last edited by terminus mos; 17th Jul 2013 at 02:37.