Matari,
I'd be interested to know which fasteners you've seen which are not locked per the FAR requirements. If on your preflights you ever spot a non-locked fastener please let your engineers/mechanics know asap.
Let me see,
AS 350 Servo locking of rod end to piston shaft - ONE locking device.
EC135 - SEMA Actuators - ONE locking device. Same item on 155 is lockwired.
EC 130/135 Fenestron Pitch Change spider bolts - ONE locking device.
The issue is these items are required to have TWO locking devices.
Granted we all know that they don't/shouldn't come loose but there have been cases of incorrect (too short and too long) fasteners being used and the locking is ineffective or their is lost travel in the control run. The fasteners which were too long was the manufacturers fault.
These items continue to perform as designed yet are not in compliance with FAR/EASA Part or CS 27/29 as appropriate the wording is the same.
The fasteners you mention only have a single locking device - which does not comply with the TC Rules as written.