SZD unsafe, this has been done to death, please check the facts, DVT said that, take a look back at post 392 and they had to admit they were wrong in post 369.
http://www.pprune.org/8760477-post392.html
http://www.pprune.org/8760581-post396.html
Stange DVT's last post was on 3 Dec 2014 and you joined 6 Dec 2014, any connection?