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alternator whine

 
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alec(at)alecmyers.com
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PostPosted: Thu Oct 05, 2017 5:38 pm    Post subject: alternator whine Reply with quote

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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PostPosted: Thu Oct 05, 2017 6:38 pm    Post subject: Re: alternator whine Reply with quote

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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PostPosted: Fri Oct 06, 2017 6:31 am    Post subject: alternator whine Reply with quote

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
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PostPosted: Sat Oct 07, 2017 10:42 am    Post subject: alternator whine Reply with 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.
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 (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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PostPosted: Sat Oct 07, 2017 3:34 pm    Post subject: alternator whine Reply with quote

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
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PostPosted: Sat Oct 07, 2017 3:50 pm    Post subject: alternator whine Reply with quote

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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