Today's Message Index:
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0. 05:48 AM - Coming Soon - The List of Contributors - Please Make A Contribution Today! (Matt Dralle)
1. 08:21 AM - Re: Picture of a CJ-6 booster coil bracket? (stephen.hayne)
2. 10:52 AM - Re: Re: lite blub (Walter Lannon)
3. 11:52 AM - Re: [Non-DoD Source] Yak55M Tachometer (Roger Kemp)
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| Subject: | Coming Soon - The List of Contributors - Please Make A Contribution |
Today!
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| Subject: | Re: Picture of a CJ-6 booster coil bracket? |
This is just a pic from my archives, but does it help?
--------
-
Dr. Stephen C. Hayne, Professor, CIS, Colorado State University
__!__
_____(_)_____ 666CJ
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474435#474435
Attachments:
http://forums.matronics.com//files/img_0248_423.jpg
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Hi Gil;
Replaced the entire landing light installation with a Par 36 adjustable
fixture (Piper surplus which I just had laying around the shop) and a
Teledyne Alphabeam Par 36 LED ldg. light from AC Spruce.
Whelen also make a similar Par 36 type unit (and many others). Price
slightly less than Teledyne and I think they have a similarly sized unit
with mounting provision that does not require the std. Par 36 mount.
Walt
-----Original Message-----
From: glipaz
Sent: Saturday, November 04, 2017 3:27 PM
Subject: Yak-List: Re: lite blub
Walt, what about for CJ landing light?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474334#474334
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| Subject: | Re: Yak55M Tachometer |
As Mark said. It is mostly a failure at on of the solder joints on the pin connection
at the Tach Gen.
Doc
Sent from my iPad
> On Nov 1, 2017, at 6:40 PM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitterlich@navy.mil>
wrote:
>
>
> The tach in the Russian airplanes uses a 3 phase AC system. The actions of
your tach indicator point to one of the phases being intermittent or missing entirely.
The typical place this fails is in the solder joint of the tach generator
cannon plug itself. Not always mind you, but it is a good place to start
looking. Lots of ways to check this. You can start by checking the wires
with an ohm-meter by removing both the tach gen and tach indicator plugs and
checking continuity.
>
> If the wiring checks good... and you are certain... absolutely certain.... then
the next most likely thing is the tach generator itself. Best to borrow one,
and give it a try!
>
> Failing that, you can use a AC volt-meter and pull the plug off the indicator
and with the engine running check between one phase and another to try to see
if one is missing. Like pin A to B, then A to C, and then B to C kind of thing.
Voltages between phases should all be identical. Or close to it.
>
> Lastly, it is actually possible to remove the tach gen, then CAREFULLY put the
end into an electric drill and spin it to create the voltages that need to be
checked. This is a really Rube Goldberg creation mind you, but I've done it
once or twice.
>
> Of course doing all of this with no spare parts to plop in and check makes the
task much much more difficult. The best thing in the world is to just borrow
a few parts to figure this out, but you can fervently hope it is just a bad
solder joint, which it very well might be.
>
> Bottom line, I've never seen an indicator fail. I've heard of one failing, but
I've never seen it. On the other hand, I have seen many cases of failed tach
generators, and failed wiring.
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Dan Caldwell
> Sent: Thursday, October 26, 2017 7:49 PM
> To: yak-list@matronics.com
> Subject: [Non-DoD Source] Yak-List: Yak55M Tachometer
>
>
> The past two flights my tach has run backward after start. Each time I shut the
engine down and restarted it which seemed to get the tach running normally.
> Today it did the same thing except during flight it went to zero and no longer
responds to the engine.
> I have researched it in the Matronics archives and suspect that one or more of
the pin connectors is not making contact.
> The cannon plug seems to be fine. Is there a way to check continuity or check
that the tach hasn't just failed?
>
> Sent from my iPad
>
>
>
>
>
>
>
>
>
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