May i suggest FAA AC43.13-2B, chapter 9, titled shoulder harness installations, pages 83 thru 106 and
Aerospace Standard SAE, AS8043 restraints systems for civil aircraft.
The friction increase set screw feature fiasco is there to further eliminate cumulative control yoke to CRES tube end play/slop in service, over time.
Condition is/was exacerbated by single (1ea) taper critical ream out process either deviated from or the result
of poor execution/workmanship...
3DDAVE;
/A/ winding an adhesive saturated thread of any sort/material as a repair in this application is a non starter from an aircraft engineering and or FAA certification/approval stand point. In particular, flight control systems !
However, i have used "close fit" brass tubing in repairing...
Gentlemen, thank you both for your feedback.
Mint Julep; it does indeed appear to be a set screw that may induce additional radial stresses in the cast aluminum element of this assembly, leading to eventual fatigue, although i cannot confirm.
Let alone certifying friction only, an expanding...
Do you maybe suspect a bad heat treat?
Agree, but in this case, it is the combination thereof that makes it suspect particularly over time. This pin is headless and thereby the once controlled interference fit durability cannot/will not be maintained. As relative wear/play develops between...
Attached pictures document the condition.https://files.engineering.com/getfile.aspx?folder=8234b69e-c757-41c7-bbae-8d093f6068d8&file=2024-09-25_Mooney_Control_Wheel.pdf
That was the design implemented by Mooney aircraft then (circa 45+ years ago).
This may not be best design / practice today, thereby the question.
In this case, the cast Al yoke fractured off in the pilot's hands but cannot confirm whilst in flight or on the ground.
Maybe borrow the concept of low pressure compressor VSV (variable stator vanes and unison ring) eg: P&W JT9D and many others applied to turbines nozzle guide vanes.
Regarding taper lok / taper pin type fasteners in aerospace applications;
Can anyone confirm it would not be prudent to use such fasteners thru investment castings made of aluminum and or cast iron materials loaded predominantly in shear.
In particular, tubular shapes of relatively thin wall...
