I've lost count how many times I've pointed this out to various authorities and interested parties:
http://www.ryanair.com/doc/investor/...nceRepairs.pdf , note the use of the word 'endeavors' in the first paragraph
And then read:
Terrifying Ryanair 21,000ft emergency descent 'forced by maintenance errors' - AOL Travel UK
and:
BBC News - Ryanair emergency descent 'forced by maintenance errors'
Maybe this, and similar incidents have something to do with Siemens decision?