AeroElectric-List Digest Archive

Sun 02/07/10


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     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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    Time: 08:20:47 AM PST US
    Subject: Re: Starter engaged light
    From: "XeVision" <dblumel@XeVision.com>
    [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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    Time: 11:54:32 AM PST US
    From: "glen matejcek" <aerobubba@earthlink.net>
    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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    Time: 12:06:43 PM PST US
    From: "glen matejcek" <aerobubba@earthlink.net>
    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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    Time: 03:43:58 PM PST US
    Subject: RS-232
    From: "PaulR" <prose@panhandle.rr.com>
    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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    Time: 05:58:53 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    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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    Time: 06:00:56 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: RS-232
    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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