dustin_96
Member
Section 5.20 spells out a straightforward process of setting the torque for various sized nuts and bolts. While I understand the theory behind adding the friction drag torque to the standard torque, I get a little tripped up in implementation.
Currently I am going through the process of torquing the AN3 bolts that attach the wing ribs to the main wing spar on an RV-14A. These utilize self locking nuts so the chart prescribes a torque setting of 28 in-lbs.
My struggle has to do with determining the friction drag torque figure.
First question: is friction torque to be determined for each bolt? There seems to be a significant difference in drag from one to the next.
Second question: my torque wrench is incapable of measuring below 10 in-lbs. Most of the bolts seem to has a friction drag torque of something less than 10. Is there just a "plug-in" figure that I should use if not able to measure? For example, if less than 10 should I just assume 5, therefore the torque wrench should be set at 28+5=33?
Thanks! I may be overthinking this but just want to make sure I'm doing it right.
Currently I am going through the process of torquing the AN3 bolts that attach the wing ribs to the main wing spar on an RV-14A. These utilize self locking nuts so the chart prescribes a torque setting of 28 in-lbs.
My struggle has to do with determining the friction drag torque figure.
First question: is friction torque to be determined for each bolt? There seems to be a significant difference in drag from one to the next.
Second question: my torque wrench is incapable of measuring below 10 in-lbs. Most of the bolts seem to has a friction drag torque of something less than 10. Is there just a "plug-in" figure that I should use if not able to measure? For example, if less than 10 should I just assume 5, therefore the torque wrench should be set at 28+5=33?
Thanks! I may be overthinking this but just want to make sure I'm doing it right.