At 12:36 PM 12/15/2012, Rob wrote:
>The HH52A (Coast Guard helicopter) had a Jesus Nut, it was the large
>castellated nut on top of the Main Gear Box shaft, it kept the rotor
>head attached to the gear box. There was a large lock washer, a tab
>was bent to secure the nut.

Same idea on the Iroquois.  But large structural fastener or little
E-clip, its named after what you say immediately after if flies off;
'cause either you or the clip are about to become difficult to find.

;-)
d