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I can't find anything about the practice of notching drain lines.  I have a screenshot from user "Rotax Wizard" that I think is about 2 years old, but I can't find it in the forum, or in my AC-43-1B.  He says:  "Common practice for all drain lines is to notch the line somewhere within the nacelle before it exits into any low-pressure area." 

Any details on this? 

Thanks,

Mike 

  • Re: Notching Drain Lines?

    by » 5 hours ago


    Is this what you’re looking for?

     

    43266_2_IMG_8371.jpeg (You do not have access to download this file.)

    Walt

    my blog; waltsrv12.com


    Thank you said by: Michael Tucker

  • Re: Notching Drain Lines?

    by » 5 hours ago


    Yes! I was looking in section 73... Thanks!

     


  • Re: Notching Drain Lines?

    by » 4 hours ago


    Hi Michael,

    The concept is simple the application not so.

    Concept

    You don't want a vacuum, being transmitted up the hose, to the system it is venting/draining.

    A vacuum (low pressure zone) is likly in the area just behind the cowling where the air exits.

    You are advised to have your vent lines exit overboard (behind the cowling where there may be a vacuum).

    Make a hole (cut a notch) in the vent tube in a higher pressure (than behind the cowling).

    The hole will allow high pressure in, to counter any vacuum created.

    Applicating

    Problem - where to cut notch in high pressure area???????

    My solution - T piece in end of vent hose.

    Using leg of T, connect & run a second vent hose to high pressure zone - in my case  top of firewall.

    Job done - no chance of vacuum being transmitted to system😈


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