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alternator whine

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alec(at)alecmyers.com
Guest

Posted: Thu Oct 05, 2017 5:38 pm Post subject: alternator whine

Hi Bob and others,



My 182 has a noticeable alternator whine, about 5kHz (I’m guessing) at cruise rpm. I think it’s worse recently than it used to be.



Where and what should I start investigating?

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user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Thu Oct 05, 2017 6:38 pm Post subject: Re: alternator whine

Check the AC (Alternating Current) component of the alternator output. If it is more than 1 volt, suspect a bad diode.

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Oct 06, 2017 6:31 am Post subject: alternator whine

At 08:37 PM 10/5/2017, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com>



 Hi Bob and others,



 My 182 has a noticeable alternator whine, about 5kHz (I’m guessing) at cruise rpm. I think it’s worse recently than it used to be.



 Where and what should I start investigating? 	


   Does operation of any audio panel selector

   switch or setting of any radio or audio

   system volume control have an effect on

   the perceived noise?



 

 

   Bob . . .

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alec(at)alecmyers.com
Guest

Posted: Sat Oct 07, 2017 10:42 am Post subject: alternator whine

I did a little investigation yesterday - No aircraft control affects the volume, except the volume control directly on my headset. Even turning up the panel intercom volume doesn’t make any difference.

 	  Quote: 	
		  On Oct 6, 2017, at 10:30 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

  At 08:37 PM 10/5/2017, you wrote:  	  Quote: 	
		  --> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)> Hi Bob and others, My 182 has a noticeable alternator whine, about 5kHz (Iâm guessing) at cruise rpm. I think itâs worse recently than it used to be. Where and what should I start investigating? 	
   Does operation of any audio panel selector   switch or setting of any radio or audio   system volume control have an effect on   the perceived noise?  

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 07, 2017 3:34 pm Post subject: alternator whine

At 01:40 PM 10/7/2017, you wrote:

  	  Quote: 	
		  I did a little investigation yesterday - 

 No aircraft control affects the volume, except the volume control directly on my headset. Even turning up the panel intercom volume doesn’t make any difference. 	


   Aha!  Good data. 



   check to see if your headset jacks are grounded

   to airframe locally. Depending on age of your Cessna,

   that could have been standard practice at the factory.



   If grounded locally, mount the jack on an insulating

   washer and run a ground wire all the way back to

   the radio grounds.  You may find that there already

   is a ground wire but no washer . . . in which case

   adding the washer is likely to fix it.



 

 

   Bob . . .

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alec(at)alecmyers.com
Guest

Posted: Sat Oct 07, 2017 3:50 pm Post subject: alternator whine

Awesome. I’ll give it a try, and report back.



On Oct 7, 2017, at 19:33, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

  At 01:40 PM 10/7/2017, you wrote:

  	  Quote: 	
		  I did a little investigation yesterday - 

 No aircraft control affects the volume, except the volume control directly on my headset. Even turning up the panel intercom volume doesn’t make any difference. 	


   Aha!  Good data. 



   check to see if your headset jacks are grounded

   to airframe locally. Depending on age of your Cessna,

   that could have been standard practice at the factory.



   If grounded locally, mount the jack on an insulating

   washer and run a ground wire all the way back to

   the radio grounds.  You may find that there already

   is a ground wire but no washer . . . in which case

   adding the washer is likely to fix it.



 

 

   Bob . . .

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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:

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