Join Date: Dec 2008
Location: Calgary, AB, Canada
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Yes, locking biners are a must at the jackline or u-bolt end. The CE standard includes a test procedure where the biner is rotated through certain arcs on 2 different sized u-bolts. It is very sobering to see just how easily a plain wire gate biner will unclip from a u-bolt; plain biners generally fail on the first rotation.
I had one come off a jackline in 2000 on a delivery from Honolulu. In the middle of the night I was going forward when it caught on something and came loose. Fortunately it attached it self to a genoa sheet. Never again.
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As I sail, I praise God, and care not. (Luke Foxe)