For my fellow geeks out there, The following is a statement on the R66 TCDS which is free for all at
FAA: Home :
"Exemption No. 9589, dated January 28, 2008, to § 27.695. This exemption was granted to permit a powered flight control system without considering the
jamming of a control valve as a possible single failure."
This is the reason for the lack of EASA certification.
Another statement that is of interest to everyone bolting GPS's into their aircraft without an approved mod... as happened behind my back as I walked away from the aircraft I had just certified the build of:
"NOTE 6. Determination for compliance with 27.562(c)(5), Head Impact Criteria (HIC) must be performed for any equipment installed in the cockpit or passenger cabin."