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  #31  
Old 02-18-2015, 04:55 PM
sblack sblack is offline
 
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Magnetic plugs are common in helicopters and jet engine oil systems are they not? A false sense of security? Leading to disaster? Seriously? I can't see a downside personally.
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  #32  
Old 02-19-2015, 07:58 AM
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JonJay JonJay is offline
 
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Quote:
Originally Posted by sblack View Post
Magnetic plugs are common in helicopters and jet engine oil systems are they not? A false sense of security? Leading to disaster? Seriously? I can't see a downside personally.
Don't want to derail the thread. If folks want to discuss the merits or lack of, probably should open a new thread. If you want a device that will alert you to an impending issue, put in a proper chip detector.
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  #33  
Old 02-20-2015, 11:04 AM
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swisseagle swisseagle is offline
 
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Default Found it!

YES! Due to all of your comments and inputs, he pulled the mags and found where the missing part belongs to:


He also showed it to an A&P, he has never seen that a cotterpin broke off like this!?

He will replace both cotter pins ... just to be sure.

I think we could catch it in time and react fine to not end up with a bigger damage. Thank you all!
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  #34  
Old 02-20-2015, 11:39 AM
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Excellent! That is how maintenance is supposed to work. Many people don't even know to check that screen.
This break looks eerily like the one that broke on me. Just goes to show that a simple thing like a cotter pin can be manufactured with a defect, assuming that is why it broke. I think that is a pretty good assumption though.
Again, good catch and kudo's to all the sleuths that guessed correctly on where it came from.
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  #35  
Old 02-20-2015, 12:59 PM
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PerfTech PerfTech is offline
 
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Quote:
Originally Posted by swisseagle View Post
YES! Due to all of your comments and inputs, he pulled the mags and found where the missing part belongs to:


He also showed it to an A&P, he has never seen that a cotterpin broke off like this!?

He will replace both cotter pins ... just to be sure.

I think we could catch it in time and react fine to not end up with a bigger damage. Thank you all!
Wow! That makes you want to look at your own. This had the potential of falling into the accessory case gears and spelling disaster for your engine. The piece doesn't show any signs of that so looks like all is well. Good Find, Allan..
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  #36  
Old 02-20-2015, 06:46 PM
BillL BillL is offline
 
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Quote:
Originally Posted by swisseagle View Post
YES! Due to all of your comments and inputs, he pulled the mags and found where the missing part belongs to:

He also showed it to an A&P, he has never seen that a cotterpin broke off like this!?

He will replace both cotter pins ... just to be sure.

I think we could catch it in time and react fine to not end up with a bigger damage. Thank you all!
Great Find - It is always luck that FOD does not get caught in something. The systems worked this time and it was an accessible component too. I will be checking my screen regularly!
Thanks!!
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  #37  
Old 02-20-2015, 08:00 PM
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N941WR N941WR is offline
 
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This is a good example of why you should remove your ignitions at every condition inspection, regardless if they are mags, P-mags, or whatever.
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  #38  
Old 02-21-2015, 08:35 AM
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az_gila az_gila is offline
 
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Exclamation

I don't know if it's a different material from the "standard" aircraft parts, but Slick has their own part number (not a MS number) for that cotter pin -

SLICK M2556 COTTER PIN

http://www.aircraftspruce.com/catalo...00svcparts.php
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  #39  
Old 02-21-2015, 09:05 AM
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flyboy1963 flyboy1963 is offline
 
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Default part numbers and true differences?

This reminds me of a friend handing me some 'real Piper' cotter pins to use on my main axle nuts. they were real pretty gold anodized ones, and looked like they might even be worth the $5 list price!
....but most of us buy the 'case of 1000 assorted cotter pins' and use whatever fits our needed application.
This makes me think twice about that practice!

....are 'real' cotters a softer alloy or higher strength than the dime store ones?
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  #40  
Old 02-21-2015, 09:52 AM
jrs14855 jrs14855 is offline
 
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Location: Lake Havasu City AZ
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Default Cotter Pins

I have seen people use "water pump pliers" oriented to the ends of cotter pins to squeeze the cotter pins after installation. If this is done too aggressively it can leave tool marks on the cotter pin, which in turn could lead to failure. It would be of interest to examine the failed cotter pin under a magnifying glass to see if any tool marks can be seen.
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