Aren't all engine (and flying control*) linkages secured by split pins in castellated nuts, not self-locking nuts?
I know of one case in which an HS748 throttle became disconnected because the pin hadn't been fitted. Fortunately it happened on the ground.
* On second thoughts, some light aircraft flying control rods are secured with stiffnuts. IIRC, a Cessna 206 accident some years ago was the result of a Kayloc in the elevator bellcrank connection coming undone, allowing the bolt to fall out.
Last edited by stevef; 28th Jun 2009 at 10:31.