Today's Message Index:
----------------------
1. 05:09 AM - SD-20 Alternator / SB1B-14 regulator failure modes (Ralph E. Capen)
2. 07:32 AM - Re: SD-20 Alternator / SB1B-14 regulator failure modes (Carl Froehlich)
3. 07:32 AM - Re: SD-20 Alternator / SB1B-14 regulator failure modes (Larry Bowen)
4. 07:59 AM - Re: SD-20 Alternator / SB1B-14 regulator failure modes (Ralph E. Capen)
Message 1
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| Subject: | SD-20 Alternator / SB1B-14 regulator failure modes |
Looking to see if anyone has ever experienced a failure of either of these two
types of units. This is a backup unit be design so a failure might not get noticed
- until you need it. My start-up checklist has me powering on the backup
unit first, checking for amps generated and the warning light on...then power
up the primary unit - I get more amps and the secondary light goes out...
Not looking to bad-mouth anyone.....my back-up alternator did not come on-line
during my start-up checklist. No biggie - I was going on a local VFR fun flight
close enough to get back to home-plate if necessary. Anyone experienced anything
with theirs - how did it present? what was the cause? How did you determine
/ diagnose? What did you do to repair?
My line of troubleshooting thinking has me first checking to make sure the unit
turns when the engine turns - then looking at the two ckt breakers and finally
testing for current at the field wire on the back of the alternator.
Thanks,
Ralph Capen
Message 2
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| Subject: | Re: SD-20 Alternator / SB1B-14 regulator failure modes |
Yep - had a neighbor with a failed unit on his 360 Lancair. After troubleshooting
a mess of wiring, I told him to pull the alternator for bench testing. Turns
out the alternator rotor shaft sheared at the coupling to the accessory drive
gear. I think I remember this being a phenolic piece - but I could be wrong.
When are you going to swing by Dogwood?
Carl
On Feb 5, 2013, at 8:08 AM, "Ralph E. Capen" <recapen@earthlink.net> wrote:
>
> Looking to see if anyone has ever experienced a failure of either of these two
types of units. This is a backup unit be design so a failure might not get
noticed - until you need it. My start-up checklist has me powering on the backup
unit first, checking for amps generated and the warning light on...then power
up the primary unit - I get more amps and the secondary light goes out...
>
> Not looking to bad-mouth anyone.....my back-up alternator did not come on-line
during my start-up checklist. No biggie - I was going on a local VFR fun flight
close enough to get back to home-plate if necessary. Anyone experienced
anything with theirs - how did it present? what was the cause? How did you determine
/ diagnose? What did you do to repair?
>
> My line of troubleshooting thinking has me first checking to make sure the unit
turns when the engine turns - then looking at the two ckt breakers and finally
testing for current at the field wire on the back of the alternator.
>
> Thanks,
> Ralph Capen
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: SD-20 Alternator / SB1B-14 regulator failure modes |
The one failure I happen to see was when I could turn the unit by hand. I
could feel some resistance from the magnets, but not much else. I don't
know the final diagnosis of that unit.
On Tuesday, February 5, 2013, Ralph E. Capen wrote:
> >
>
> Looking to see if anyone has ever experienced a failure of either of these
> two types of units. This is a backup unit be design so a failure might not
> get noticed - until you need it. My start-up checklist has me powering on
> the backup unit first, checking for amps generated and the warning light
> on...then power up the primary unit - I get more amps and the secondary
> light goes out...
>
> Not looking to bad-mouth anyone.....my back-up alternator did not come
> on-line during my start-up checklist. No biggie - I was going on a local
> VFR fun flight close enough to get back to home-plate if necessary. Anyone
> experienced anything with theirs - how did it present? what was the cause?
> How did you determine / diagnose? What did you do to repair?
>
> My line of troubleshooting thinking has me first checking to make sure the
> unit turns when the engine turns - then looking at the two ckt breakers and
> finally testing for current at the field wire on the back of the alternator.
>
> Thanks,
> Ralph Capen
>
>
--
--
Larry Bowen
Larry@BowenAero.com
http://BowenAero.com
Message 4
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| Subject: | Re: SD-20 Alternator / SB1B-14 regulator failure modes |
Thanks - the shaft is not metal (IIRC) and is my first step in the diagnostics
(after checking the two ckt breakers).
Still trying to get my engine re-broke-in. The back-up alternator is keeping me
in VMC and within battery-distance to homeplate for now. You're a short hop
(over the bay and Pax River) so it's near the top of my list.....
-----Original Message-----
>From: Carl Froehlich <carl.froehlich@verizon.net>
>Sent: Feb 5, 2013 10:31 AM
>To: "rv-list@matronics.com" <rv-list@matronics.com>
>Subject: Re: RV-List: SD-20 Alternator / SB1B-14 regulator failure modes
>
>
>Yep - had a neighbor with a failed unit on his 360 Lancair. After troubleshooting
a mess of wiring, I told him to pull the alternator for bench testing. Turns
out the alternator rotor shaft sheared at the coupling to the accessory drive
gear. I think I remember this being a phenolic piece - but I could be wrong.
>
>When are you going to swing by Dogwood?
>
>Carl
>
>On Feb 5, 2013, at 8:08 AM, "Ralph E. Capen" <recapen@earthlink.net> wrote:
>
>>
>> Looking to see if anyone has ever experienced a failure of either of these two
types of units. This is a backup unit be design so a failure might not get
noticed - until you need it. My start-up checklist has me powering on the backup
unit first, checking for amps generated and the warning light on...then power
up the primary unit - I get more amps and the secondary light goes out...
>>
>> Not looking to bad-mouth anyone.....my back-up alternator did not come on-line
during my start-up checklist. No biggie - I was going on a local VFR fun flight
close enough to get back to home-plate if necessary. Anyone experienced
anything with theirs - how did it present? what was the cause? How did you
determine / diagnose? What did you do to repair?
>>
>> My line of troubleshooting thinking has me first checking to make sure the unit
turns when the engine turns - then looking at the two ckt breakers and finally
testing for current at the field wire on the back of the alternator.
>>
>> Thanks,
>> Ralph Capen
>>
>>
>>
>>
>>
>>
>>
>
>
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