Today's Message Index:
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1. 08:20 AM - Re: Starter engaged light (XeVision)
2. 11:54 AM - Re: Starter engaged light, was Starter and contactor (glen matejcek)
3. 12:06 PM - Re: was Starter engaged light, was Starter and contactor wiring, now lost airframe (glen matejcek)
4. 03:43 PM - RS-232 (PaulR)
5. 05:58 PM - Re: Re: Starter engaged light (Robert L. Nuckolls, III)
6. 06:00 PM - Re: RS-232 (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Starter engaged light |
[quote="nuckolls.bob(at)aeroelect"]At 01:35 PM 2/6/2010, you wrote:
> Good Afternoon 'Lectric Bob,
>
> I have a faint memory of a Cessna 210 having that sort of problem. I think that
was the incident that prompted your old company to add starter engaged warning
lights to their new production aircraft..Maybe around 1980 or so?
>
> Am I way off base here?
Not at all. Starter engaged lights were added to a number
of Beechcraft airframes as reports came in about damage
to starters and ring gears from stuck contactors. I
was struck by the notion that such a failure started a
chain of events that brought the airplane down. It
would be interesting to read the reports on the incident
if they can be retrieved.
Some years ago at OSH, some airshow performer reported
having "teased a starter contactor closed with the
g-loads of the performance" causing it it to weld and
ultimately do a lot of damage to the starter and
ring gear.
It's almost a sure bet that the contactor stuck during
cranking and was simply overlooked as the performer
was pre-occupied with the immediate task. G-loads
just don't close a starter contactor . . . they MIGHT
close an OPEN battery contactor . . . but who flies
around with a battery contactor open?
Bob . . .
> [b]
That is one reason why all of my solenoids are mounted sideways.
--------
LED still has a long way to go to compete with HID as a landing light. This is
true in terms of total lumens and reach (distance).
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=285218#285218
Message 2
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Subject: | RE: Starter engaged light, was Starter and contactor |
I'll see what I can scrounge up. I don't think an accident report was
generated, but I know a fellow who was involved and will see what details I
can get.
>There was an airframe lost a while back due to a stuck contactor and the
>ensuing electrical fire, but that involved significantly different and more
>robust hardware.
Do you have a source for more information on this
event?
glen matejcek
aerobubba@earthlink.net
Message 3
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Subject: | RE: was Starter engaged light, was Starter and contactor |
wiring, now lost airframe
Hi Bob-
I was able to find this:
http://www.ntsb.gov/ntsb/GenPDF.asp?id=FTW90DRA10&rpt=fi
Some of the physical description of the airframe may be a bit misleading,
but teh fundamental process seems to be accurate.
glen matejcek
aerobubba@earthlink.net
Message 4
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I'm wiring up my panel and was getting ready to hook the Dynon D-100 serial output
to the GTX-327. Reading the wiring diagram for the Garmin, it says to hook
the TX wire from the Dynon to a certain pin.(I forgot which number) and that
the RS-232 GND to either of two chassis grounds on the Garmin. I take that to
mean that the RS-232 gnd should be at the same potential as the rest of the
12V grounds and could be connected to the "forrest of tabs" where the balance
of the grounds are hooked.
If that's true, then couldn't all the RS-232 gnds be connected there, along with
their respective shields?
Am I thinking this through correctly?
Thanks
--------
Paul Rose
N417PR (res)
RV-9A
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=285272#285272
Message 5
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Subject: | Re: Starter engaged light |
> It's almost a sure bet that the contactor stuck during
> cranking and was simply overlooked as the performer
> was pre-occupied with the immediate task. G-loads
> just don't close a starter contactor . . . they MIGHT
> close an OPEN battery contactor . . . but who flies
> around with a battery contactor open?
>
> Bob . . .
>
> > [b]
>
>
>That is one reason why all of my solenoids are mounted sideways.
Why? Under what conditions of system operation and maneuvers
in flight would you expect an increased risk of unintended
behaviors?
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 6
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At 05:40 PM 2/7/2010, you wrote:
>
>I'm wiring up my panel and was getting ready to hook the Dynon D-100
>serial output to the GTX-327. Reading the wiring diagram for the
>Garmin, it says to hook the TX wire from the Dynon to a certain
>pin.(I forgot which number) and that the RS-232 GND to either of two
>chassis grounds on the Garmin. I take that to mean that the RS-232
>gnd should be at the same potential as the rest of the 12V grounds
>and could be connected to the "forrest of tabs" where the balance of
>the grounds are hooked.
>
>If that's true, then couldn't all the RS-232 gnds be connected
>there, along with their respective shields?
SIGNAL grounds are different and sometimes separate of
POWER grounds. The forest-of-tabs is for the grounding
of electrical accessories. When it comes to wiring
components of a radio, navigation or other electronics,
follow the instructions. SIGNAL grounds are like the
grounds for microphones, headsets, etc and are given
specific treatment. See the documentation on the DIY
audio isolation amplifier on my website for examples.
Bob . . .
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