Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

ANL 50 Failure

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

Dave(at)AirCraftersLLC.co
Guest

Posted: Fri Mar 14, 2008 8:52 am Post subject: ANL 50 Failure

Here is a picture of a current limiter from  a recent job.  It had been replaced for unknown reasons over a year  ago.  The installer didn't use a washer between the limiter terminal tab  and the nut.  The nut grabbed and torqued the tab, deformed the ears that  are supported by the rivets, and partially tore the base of the filiment (right  word?)  After many months the filiment finally broke.  I don't think  it was experienceing any particularly high current load, but from the looks of  the mounting terminal, it did see some pretty rough handling.

  

  Dave Saylor

 AirCrafters LLC

 140 Aviation Way

 Watsonville, CA 

 831-722-9141

 831-750-0284 CL

 www.AirCraftersLLC.com

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

IMG_2477.JPG

Description:

Filesize:

83.38 KB

Viewed:

317 Time(s)

flybill2usa(at)msn.com
Guest

Posted: Fri Mar 14, 2008 5:42 pm Post subject: ANL 50 Failure

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Thank you Dave for sharing that critical information. I will be very  careful when installing the 3 ANLs in my RV-7, 

 project.

  

 Bill Schoen

 N727BN res

 South Fork, Co. 

 [quote]   ---

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

nuckolls.bob(at)cox.net
Guest

Posted: Sat Mar 15, 2008 7:11 pm Post subject: ANL 50 Failure

At 09:49 AM 3/14/2008 -0700, you wrote:



 	  Quote: 	
		  Here is a picture of a current limiter from a recent job.  It had been 

replaced for unknown reasons over a year ago.  The installer didn't use a 

washer between the limiter terminal tab and the nut.  The nut grabbed and 

torqued the tab, deformed the ears that are supported by the rivets, and 

partially tore the base of the filiment (right word?).


	


    Looks like it was probably stress cracked, there's

    no evidence of a melt-open event.



 	  Quote: 	
		     After many months the filiment finally broke.  I don't think it was 

 experienceing any particularly high current load, but from the looks of 

 the mounting terminal, it did see some pretty rough handling.


	




   Thanks for sharing this with us. This is

   an excellent reminder of the need to think about

   where reaction torques are going when we cinch things

   down tight. Another at-risk-joint is on the fat-wire

   main terminals of these contactors:



http://www.aeroelectric.com/Pictures/Contactors/s701-2.jpg



   It's a good idea to put a wrench on the nut adjacent

   to the case and put some counter-acting torque while

   tightening the nut that holds wires.



   Take a look at:



http://www.aeroelectric.com/Pictures/Fuses/Fuse_Holders/ANN-ANL_Base.jpg



   If you look real closely under the washers, you'll see the

   bottom nut in the stack for each terminal. The things that

   should on top of the first nut are terminals on ends of wires

   and/or straps. Next is the second, thin,-jam nut, preferably

   brass torqued to 80% of ultimate for brass. The ANL limiter goes next

   followed by the washer and finally, the third locking nut shown.



   This order of assembly allows replacing of the ANL without

   opening the joints for conductors.



   Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum