Avionics-List Digest Archive

Tue 07/05/05


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     1. 05:46 AM - Re: Split Pin Connectors? (Colin Durey)
     2. 07:47 AM - Re: Split Pin Connectors? (David Lloyd)
     3. 08:53 AM - MicroAir T2000 Transponder & ALT-4 .... (Tom...)
     4. 09:50 AM - Re: MicroAir T2000 Transponder & ALT-4 .... (Craig P. Steffen)
     5. 10:02 AM - Re: MicroAir T2000 Transponder & ALT-4 .... (Mike Ferrer)
 
 
 


Message 1


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    Time: 05:46:53 AM PST US
    Subject: Re: Split Pin Connectors?
    From: "Colin Durey" <colin@ptclhk.com>
    --> Avionics-List message posted by: "Colin Durey" <colin@ptclhk.com> Could be one of two things... A. Some connectors use a split (bifurcated) pin, that is, a pin which has a small londitudinal cut, which makes the end of the pin compressible. This pin can then be pushed into a mating socket, which compreses it, thus providing a more positive electrical contact. The usual way is to have a solid pin, which pushes into a multi-fingered socket. Which is actually better, I don't know. However, the sort of connectors that are used in avionics are usually expensive, not neccesarrily because they need to be, but just because its avionics, and they've got you over a barrel. OR B. It could just be a "snow job". Typicaly, such connectors do not fail unless 1) they are coupled and uncoupled many times, or, 2)there is a corrosion buildup. Ask which specific connectors are faulty, what they are fitted to, and what the specific problem with them is alledged to be. Regards Colin Durey > --> Avionics-List message posted by: <bakerocb@cox.net> > > 7/4/2005 > > Hello Experts and a Happy Independence Day to you, My friend took his > Beechcraft Sierra to an avionics shop because his autopilot was not > working > when he retrieved the airplane from its annual inspection. > > The avionics shop gave him a tale of woe plus big $$$$$ about needing to > replace a bunch of "split pin connectors" in the autopilot wiring system. > > I am not familiar with "split pin connectors". Can anyone please educate > me? > Thanks. > > OC > > Regards Colin Durey Pacific Technology Corporation Ltd +61-418-677073 (M) +61-2-945466162 (F)


    Message 2


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    Time: 07:47:27 AM PST US
    From: "David Lloyd" <skywagon@charter.net>
    Subject: Re: Split Pin Connectors?
    --> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net> A friend flies a P Baron usually at flight levels of 21K or higher. His old King autopilot was giving him fits as it would randomly uncouple or roll. Turns out the main bulkhead connector was exposed to the temps of the altitude and the bifurcated pins were shrinking at a different rate than the mating socket receptors. At lower, warmer altitudes, the AP did not show any mischievous problems. He chased the electronics as the problem source. But, turns out it was some of the connector pins. He replaced the pins with the modern equivalent and has had no further problems. ----- Original Message ----- From: "Colin Durey" <colin@ptclhk.com> Subject: Re: Avionics-List: Split Pin Connectors? > --> Avionics-List message posted by: "Colin Durey" <colin@ptclhk.com> > > Could be one of two things... > > A. > Some connectors use a split (bifurcated) pin, that is, a pin which has a > small londitudinal cut, which makes the end of the pin compressible. This > pin can then be pushed into a mating socket, which compreses it, thus > providing a more positive electrical contact. The usual way is to have a > solid pin, which pushes into a multi-fingered socket. Which is actually > better, I don't know. However, the sort of connectors that are used in > avionics are usually expensive, not neccesarrily because they need to be, > but just because its avionics, and they've got you over a barrel. > > OR > > B. > It could just be a "snow job". Typicaly, such connectors do not fail > unless 1) they are coupled and uncoupled many times, or, 2)there is a > corrosion buildup. > > Ask which specific connectors are faulty, what they are fitted to, and > what the specific problem with them is alledged to be. > > Regards > > Colin Durey >> --> Avionics-List message posted by: <bakerocb@cox.net> >> >> 7/4/2005 >> >> Hello Experts and a Happy Independence Day to you, My friend took his >> Beechcraft Sierra to an avionics shop because his autopilot was not >> working >> when he retrieved the airplane from its annual inspection. >> >> The avionics shop gave him a tale of woe plus big $$$$$ about needing to >> replace a bunch of "split pin connectors" in the autopilot wiring system. >> >> I am not familiar with "split pin connectors". Can anyone please educate >> me? >> Thanks. >> >> OC >> >> > > > Regards > > Colin Durey > Pacific Technology Corporation Ltd > +61-418-677073 (M) > +61-2-945466162 (F) > > >


    Message 3


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    Time: 08:53:40 AM PST US
    From: "Tom..." <tsled@pacbell.net>
    Subject: MicroAir T2000 Transponder & ALT-4 ....
    --> Avionics-List message posted by: "Tom..." <tsled@pacbell.net> Hi, I bought a MicroAir T2000 SFL Transponder and a Stratomaster Maxi Single ALT-4, I finally got around to installing them. I made a cable according to the wiring diagram in the manual that shows these two connected. I installed them into my home built helicopter and when I power them up they both seem to go thru their start up test just fine. But when I go to "Alt Display" on the Transponder it says "NO ALTITUDE". I have removed the unites from my helicopter, buzzed the cable and it is correct. Yes I have the GNDs connected. I have it hooked up on a bench and it says the same thing. When I disconnect the encoder cable the Transponder continues to say the same thing "NO ALT". The Altimeter "seems" to indicate the correct altitude, the VSI portion "seems" to work. I sent the ALT-4 back and they say it checked out fine but just to be 100+% sure they sent me a new unit. Same exact thing. I am 99.999% sure that the cable is done according to the manual, I even had a friend buzz it too. Have ya heard of this before? Do ya have any ideas? Thanks for your time, Tom...


    Message 4


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    Time: 09:50:08 AM PST US
    Subject: Re: MicroAir T2000 Transponder & ALT-4 ....
    From: "Craig P. Steffen" <craig@craigsteffen.net>
    --> Avionics-List message posted by: "Craig P. Steffen" <craig@craigsteffen.net> > Same exact thing. I am 99.999% sure that the cable is done according to the > manual, I even had a friend buzz it too. I'm not familiar with aircraft electronics specifically, just electronics in general. Is it possible that one end of the cable is plugged in upside-down? Will it go into the case in more than one way? Be VERY careful about this--it's very easy to fry electronics getting it wrong. One thing to check on the diagrams--they usually have things like looking at the pins" or something to indicate which is left and right. Those are pretty easy to mess up, particularly when you're doing both ends of a cable. That's worth checking. Do you have access to an oscilloscope? You can look at the signals coming out of the encoder with it if you do. You won't be able to read then, but you can verify that the "clock" is pulsing, for example. Since they checked your unit, it's likley not the sender that's the problem. If you can check the signals with the two units plugged in, you can check the signals again. If anything that was sending logic signals is now just a single voltage, then you have something connected where it shouldn't be. Craig Steffen -- craig@craigsteffen.net public key available at http://www.craigsteffen.net/GPG/ current goal: use a CueCat scanner to inventory my books career goal: be the first Vorlon Time Lord


    Message 5


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    Time: 10:02:05 AM PST US
    From: "Mike Ferrer" <mike@ferrer-aviation.com>
    Subject: Re: MicroAir T2000 Transponder & ALT-4 ....
    --> Avionics-List message posted by: "Mike Ferrer" <mike@ferrer-aviation.com> As a test, disconnect the encoder and ground the B2 and C2 pins going into the transponder. That is the code for 500 feet. See if the transponder responds accordingly and displays 500. If not, there may be a problem with the transponder. Mike ----- Original Message ----- From: "Tom..." <tsled@pacbell.net> Subject: Avionics-List: MicroAir T2000 Transponder & ALT-4 .... > --> Avionics-List message posted by: "Tom..." <tsled@pacbell.net> > > Hi, > > I bought a MicroAir T2000 SFL Transponder and a Stratomaster Maxi Single > ALT-4, I finally got around to installing them. I made a cable according to > the wiring diagram in the manual that shows these two connected. I > installed them into my home built helicopter and when I power them up they > both seem to go thru their start up test just fine. But when I go to "Alt > Display" on the Transponder it says "NO ALTITUDE". I have removed the > unites from my helicopter, buzzed the cable and it is correct. Yes I have > the GNDs connected. I have it hooked up on a bench and it says the same > thing. When I disconnect the encoder cable the Transponder continues to say > the same thing "NO ALT". The Altimeter "seems" to indicate the correct > altitude, the VSI portion "seems" to work. I sent the ALT-4 back and they > say it checked out fine but just to be 100+% sure they sent me a new unit. > Same exact thing. I am 99.999% sure that the cable is done according to the > manual, I even had a friend buzz it too. > > Have ya heard of this before? Do ya have any ideas? > > Thanks for your time, > Tom... > >




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