Pilot's artificial arm 'became detached while landing plane'

[toaddy]

I admire the pilot and his skills and wish him the best. The only thing I find curious is that while every mechanical piece of the plane has been computer tested for strength, probably of failure, wear characteristics, etc., the most important mechanical device on this plane didn't get the full aerospace engineering scrutiny. If life and death mechanical aids are to be used to interface the pilot to the plane, is there some way to ensure those devices are as good and reliable as the rest of the planes interface devices (yoke, rudder pedals, etc) ? Perhaps some way to certify the clamps and latching devices.

Edit: noticed CNN has this on their front page