Today's Message Index:
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1. 11:54 AM - Re: Yak-52 Gen Fail Indication (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
2. 01:34 PM - Re: Yak-52 Gen Fail Indication (Brian Lloyd)
3. 07:15 PM - Yak 52 or CJ6? (jon)
4. 10:30 PM - Re: Yak 52 or CJ6? (Kurt Howerton)
Message 1
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| Subject: | Yak-52 Gen Fail Indication |
Actually Doc, I do not recommend checking fuses right off the bat with a
problem like Scotts. I am not a big fan of dive-bombing, although your
recommendation to check fuses is of course always a good idea, and each
person likes to do things their own way.
Personally, in a case like Scotts... And no one really knows the whole
story here since there is more that has happened than is in his original
email... But regardless, I recommend going to the DNP-200 relay and
putting an alligator clip on the bus line going to the generator. Start
the engine and watch the voltage. Not only should it be there, but it
should come up to 28 volts and start regulating with increase in engine
RPM. This is one test... It only requires removing a cover and a panel,
and tells you a LOT. If you have regulated voltage there, then it is
likely that you have a DNP-200 issue, or a broken wire, etc. If you
have voltage, the next step is to check the enable terminal on the
DNP-200 (pin V). If you have NO voltage, you move your alligator clip
right to the generator itself. Shortly you get to the point where you
check the fuses. But for example, if you DO have voltage at the
generator bus on the 200, there is simply no need to go yanking fuses to
check... They're obviously good.
Having worked with Marine Electricians on airplanes for almost the last
4 decades, I can tell you that there are clearly two ways to go about
fixing aircraft electrical issues.
First Method: "I saw this problem before, and this is what caused it
last time, ok... Try replacing that part first. If that does not work,
start replacing one part after another until it does work." This is
typically the common method and is an example of your tax dollars at
work.
Second Method: Look at the system. Understand how it works. Take
measurements at critical points until you know what MUST be bad and why
it caused the problem you are seeing. Pull part and replace it, and
know even before you turn it back on that it is going to work.
I teach the second method. The over-whelming desire by most everyone on
this planet is to use the first method.
Guess which method most general aviation guys typically use?
Now another warning against the first method. When you start swapping
out parts, you have the distinct chance of screwing something else up,
and now you have TWO problems on the same system, and that can be deadly
to find.
Scott started with a flickering generator light. He was given a
recommendation to pull the voltage regulator out and check for bad
wiring. He did that. He saw a wire that needed attention. He fixed
that wire. He put the regulator back in. Now he has a totally dead
generator with a constant generator light. Hmmmm.
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp
M.D.
Sent: Thursday, March 13, 2008 22:37
Subject: RE: Yak-List: Yak-52 Gen Fail Indication
--> <viperdoc@mindspring.com>
I'm certain by now you have talked to Mark and he has more eloquently
said what I'm about to say. Having gone through exactly this with the
help of Mark and Dennis it was sorted out. First thing to do is ohm out
your fuses in the power panel. Unfortunately on the 52, it is behind
your seat! You need to pull the fuses out of the circuit to check them
otherwise all you are going to do is ohm out your circuit. I found that
it was my 30 amp fuse that was between the main circuit between the BMP
200 and the carbon pile regulator. Sorry for my generality but my 52
wiring diagram is at the hanger.
Start with the simple, check your fuses. If you have a need for a spare
BMP 200, I have one! :>) Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich,
Mark G CIV Det Cherry Point, MALS-14 64E
Sent: Thursday, March 13, 2008 4:55 PM
Subject: RE: Yak-List: Yak-52 Gen Fail Indication
--> Point,
MALS-14 64E" <mark.bitterlich@navy.mil>
Contact me at 252-671-7005
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of
scott.glaser@thedefiantcompany.com
Sent: Thursday, March 13, 2008 17:33
Subject: Yak-List: Yak-52 Gen Fail Indication
High All,
I'm having trouble with a Gen Fail Indication on my '52. I was running
on the ground in the RPM ranges where the gen should have been on line
and the gen fail light was flickering. I shut down and checked with my
local guru who warned me of wire chaffing on the voltage regulator
damper plate. I did find a wire that was on it's way to being chaffed
but that didn't seem to be all the way through the sheath. I repaired
the wire, reconnected the voltage regulator and ran the engine. Much to
my dismay the gen fail light is now on all the time. I checked the
reset button on the voltage gadget box on the firewall above the voltage
regulator, it had not been tripped. I also opened he circuit box on the
right side behind the access panel and saw no smoking guns. Any help or
suggestions as to what could be the culprit would be greatly
appreciated!
Scott
N8252
Message 2
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| Subject: | Re: Yak-52 Gen Fail Indication |
On Mar 14, 2008, at 11:50 AM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E wrote:
> Point, MALS-14 64E" <mark.bitterlich@navy.mil>
>
> Actually Doc, I do not recommend checking fuses right off the bat
I guess that is what makes a horse race. I do tend to check the
obvious things first, e.g. fuses and broken wiring. I find that gets
about 80% of the problems without having to resort to the schematics
and the multi-meter. But once I get past those obvious thing, I am
right there with Mark.
Brian Lloyd 3191 Western Drive
brianl AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
Message 3
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Hello, Im very interested in purchasing a Yak or CJ. I have joined Redstar and
just found this forum. My question is what are somethings
to watch for in a purchase and what dealers have a good reputation.
Are CJ parts harder to find than the Yak? I am sure this has been asked
before so Thank You in advance.
John,
Wisconsin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=169924#169924
Message 4
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| Subject: | Re: Yak 52 or CJ6? |
I've recently bought a CJ-6. I've posted a bunch of information about my
experience here: http://cj6.scitechsys.com.
--
Kurt Howerton
N923YK
http://cj6.scitechsys.com
jon wrote:
>
> Hello, Im very interested in purchasing a Yak or CJ. I have joined Redstar and
just found this forum. My question is what are somethings
> to watch for in a purchase and what dealers have a good reputation.
> Are CJ parts harder to find than the Yak? I am sure this has been asked
> before so Thank You in advance.
> John,
> Wisconsin
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=169924#169924
>
>
>
>
>
>
>
>
>
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