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I have a 912ULS with a Sensenich wood/composite fixed pitch propeller and a Saber 1.25" spacer mounted to the prop shaft through the prop shaft drive lugs. The Saber spacer also has rotax drive lugs installed for the propeller bolts. I can install a lock nut on the back side of the propeller drive lugs for the Saber spacer mount but can't install a lock nut to the back side of the drive lugs inside the Saber spacer. The spinner/crush plate doesn't allow for any safety wire so I am seeking advice on the appropriate way to safety tie the prop bolts. Any suggestions are greatly appreciated

Cheers

 

Murray

  • Re: Propeller bolt safetying

    by » 5 months ago


    My aircraft/propellor with a 912 uses the nord-lock washers along with nyloc nuts for securing the propellor bolts.

     

     https://www.nord-lock.com/nord-lock/products/washers/?campaign=328043079&content=&keyword=lockwashers&placement=&utm_source=bing&utm_medium=cpc&utm_campaign=Bing_Nordlock&utm_term=lockwashers&utm_content=Bing_Nordlock%20Washer


  • Re: Propeller bolt safetying

    by » 5 months ago


    Hi Murray

    The correct way is to use drilled prop bolts and follow AC 43 procedure to lock the bolts with lockwire.  This is common practice.  

    https://www.youtube.com/watch?v=7Xck44xYeaE

     

    The video is the typical way to safety prop bolts. 

     

    Cheers

     


  • Re: Propeller bolt safetying

    by » 5 months ago


    For me this question and answer kind of depends on your Mfg's requirements. Many Mfg's are using the Nord lock washers and have gotten away from the safety wire. If your Mfg uses safety wire then use it. Sensenich uses Nord lock washers. Mfg's like Flight Design use the Nord washers. They do work very well. Matco brake company uses Nord too. They are becoming more and more common. They are a step above the old style split ring lock washers.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


    Thank you said by: James N Parker

  • Re: Propeller bolt safetying

    by » 5 months ago


    I’ve only seen propeller bolts with drilled heads that are easily safety wired. They make a jig for drilling bolts for a reasonable cost if you don’t want to buy them already drilled.


  • Re: Propeller bolt safetying

    by » 5 months ago


    Thanks for the responses. Safety wire isn't possible with the manufacturers (Sonex) spinner that is also the cruch plate. The bolt heads are resessed into the spinner. Attached is a picture. Saber recommended to use Loctite 242 however I feel that would make it difficult to retorque the bolts each time. Sensenich instructions didn't mention a prefered method of securing the bolts. I am thinking of using Nordloc washers but not certain if they require adjustment to torque values based on any friction they may have while tightening. I couldn't find any methods specific to propeller bolts in AC 43

    31573_2_Spinner.pdf (You do not have access to download this file.)

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