 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
nuckolls.bob(at)aeroelect
Guest
|
 Posted: Tue May 05, 2020 9:22 am Post subject: N88MV Accident Analysis |
 |
|
Another interesting data point.
This flight didn't last very long. Further,
the DAS system reported only a short interval
of abnormal bus voltage before the
alternator output went to zero.
The narrative says the pilot 'noticed the
batteries overheating'. I wonder how
this was observed. Bad smell? Melting
plastic? Smoke?
Bob . . .
| | - 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 |
|
|
|
| Back to top |
|
 |
ceengland7(at)gmail.com
Guest
|
| Posted: Tue May 05, 2020 9:50 am Post subject: N88MV Accident Analysis |
|
|
On 5/5/2020 12:17 PM, Robert L. Nuckolls, III wrote:
| Quote: | --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> (nuckolls.bob(at)aeroelectric.com)
Another interesting data point.
This flight didn't last very long. Further,
the DAS system reported only a short interval
of abnormal bus voltage before the
alternator output went to zero.
The narrative says the pilot 'noticed the
batteries overheating'. I wonder how
this was observed. Bad smell? Melting
plastic? Smoke?
|
Stock battery location in the RV6 is adjacent to the pilot's right foot (passenger's left foot), almost touching the firewall. Mine has an aluminum cover, but it's simple to just use a hold-down strap.
From the Katheryn's Report:
"At an altitude of about 4,000 ft, the pilot noticed that the airplane batteries, located in the cockpit near his right foot, were getting hot. "
Charlie  Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
| | - 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 |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Tue May 05, 2020 1:24 pm Post subject: N88MV Accident Analysis |
|
|
| Quote: | From the Katheryn's Report:
"At an altitude of about 4,000 ft, the pilot noticed that the airplane batteries, located in the cockpit near his right foot, were getting hot. "
Charlie
|
Yeah, that's what I'm referring to. Suppose you're
flying along fat and sassy . . . and you 'notice'
that your batteries are getting hot. How
would that come to your attention?
Bob . . .
| | - 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 |
|
|
|
| Back to top |
|
|
ceengland7(at)gmail.com
Guest
|
| Posted: Tue May 05, 2020 2:55 pm Post subject: N88MV Accident Analysis |
|
|
On Tue, May 5, 2020 at 4:30 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | | Quote: | From the Katheryn's Report:
"At an altitude of about 4,000 ft, the pilot noticed that the airplane batteries, located in the cockpit near his right foot, were getting hot. "
Charlie
|
Yeah, that's what I'm referring to. Suppose you're
flying along fat and sassy . . . and you 'notice'
that your batteries are getting hot. How
would that come to your attention?
Bob . . .
|
The battery is within a couple of inches of the pilot's right foot; he might even have his foot resting against if if he's taken his feet off the pedals & slid them forward with a bit of 'man spreading'. If it got truly 'hot' (unquantified), it's not much of a stretch to believe he felt it with his foot.
Charlie
| | - 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 |
|
|
|
| Back to top |
|
|
alec(at)alecmyers.com
Guest
|
| Posted: Tue May 05, 2020 3:25 pm Post subject: N88MV Accident Analysis |
|
|
Your shoe melts?
Sent from my iPhone
On May 5, 2020, at 6:44 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: |
On Tue, May 5, 2020 at 4:30 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | | Quote: | From the Katheryn's Report:
"At an altitude of about 4,000 ft, the pilot noticed that the airplane batteries, located in the cockpit near his right foot, were getting hot. "
Charlie
|
Yeah, that's what I'm referring to. Suppose you're
flying along fat and sassy . . . and you 'notice'
that your batteries are getting hot. How
would that come to your attention?
Bob . . .
|
The battery is within a couple of inches of the pilot's right foot; he might even have his foot resting against if if he's taken his feet off the pedals & slid them forward with a bit of 'man spreading'. If it got truly 'hot' (unquantified), it's not much of a stretch to believe he felt it with his foot.
Charlie
|
| | - 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 |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Tue May 05, 2020 5:44 pm Post subject: N88MV accident analysis |
|
|
At 08:01 PM 5/5/2020, you wrote:
| Quote: | --> AeroElectric-List message posted by: "johnbright" <john_s_bright(at)yahoo.com>
Would/could the loose alternator/engine ground wire fool the regulator into raising the field current? |
No. The built in regulator usually senses alternator
output voltage between b-terminal and alternator
case ground. The the DAS recorded voltage rise
suggests that while the alternator ground was
of poor integrity, it was still carrying a substantial
amount of current else the crank-case would have gone
negative as opposed to the observed rise in
bus voltage.
Hmmm . . . the crankcase had to be operating
at some point below ground if the ground-lead
crip was failing electrically. The various
control cable-grounds would have taken on
some of the engine ground duties too.
We are not told if this alternator was
fitted with a control input port under
crew control. The narrative speaks to
a brief attempt to restore power without
explaining what action was taken.
Bob . . .
| | - 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 |
|
|
|
| Back to top |
|
|
|
|
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
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
