Today's Message Index:
----------------------
1. 02:29 AM - Re: MAC trim servo runaway (Bob Darrah)
2. 03:53 AM - Re: MAC elevator trim rocker switch (Kevin Horton)
3. 06:11 AM - Re: Re: Altitude encoder recommendation? (LarryRobertHelming)
4. 09:49 AM - Re: Bob's server costs (KahnSG@aol.com)
Message 1
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| Subject: | Re: MAC trim servo runaway |
--> AeroElectric-List message posted by: "Bob Darrah" <RDarrah@austin.rr.com>
I have one solution for handling a MAC trim runaway. I have installed a
double pole, (on)-off-on switch in the power line that serves all three
servos. Would normally be in the on position.
In the event of a runaway, turn off the servo. It will probably have gone
to hard over before you recognize the problem and do something about it.
Now, put the switch to the (on) position reverses the power to the servos
and the stuck servo will start running the other way. When it gets about
where you want it, release, servo stops, and you can continue on.
Works great on the bench.
Bob Darrah
Message 2
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| Subject: | MAC elevator trim rocker switch |
--> AeroElectric-List message posted by: Kevin Horton <khorto1537@rogers.com>
I've got a trim and wing leveler disconnect relay that is controlled
by a red button next to the trim coolie hat on my Infinity stick
grip. That should minimize the time it takes me to cut power to the
trim once I recognize the problem. The procedure will be to press
and hold the red button, turn off the trim power, then release the
button.
I'll also be doing flight testing to establish where the limits to
trim travel should be, and to assess the stick forces and workload
required to deal with a runaway to those limits.
Kevin Horton
At 8:50 -0400 5/9/03, Mike Stewart wrote:
>--> AeroElectric-List message posted by: mstewart@qa.butler.com
>
>Happened to me in my rv at cruise. Although it was not the mac rocker
>switch, it was a micro switch in my passenger stick. Trim went to the stops
>before I could get the breaker pulled.
>
>I slowed down very quickly, and the stick force was as strong as I have ever
>had any stick force.
>
>I landed, disconnected the pass stick, and pressed on.
>
>Mike Stewart
>Rv-6a
>
>
>-----Original Message-----
>From: EddyFernan@aol.com [mailto:EddyFernan@aol.com]
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: MAC elevator trim rocker switch
>
>--> AeroElectric-List message posted by: EddyFernan@aol.com
>
>Bob & list,
>
>Just wondering if anyone out there flying with the MAC trim have ever had a
>problem with the elevator switch sticking and going full up or down.
>
>One scenario might be that you are setting up for cruise flight and while
>trimming the plane for level flight the trim switch goes to full down
>position.
>
>Or is this a very remote possibility? I'm using Z-11 architecture and B &
>C's toggles for everything except the elevator trim so that I have a
>different
>feel to the switch compared to the flaps for instance.
>
>What would be a precaution for this?
>
>Eddy Fernandez
>RV-9a
>Wiring & more wiring
>
Message 3
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| Subject: | Re: RE: Altitude encoder recommendation? |
--> AeroElectric-List message posted by: "LarryRobertHelming" <lhelming@sigecom.net>
I check with the ACK marketing folks on this. Here is the reply:
>The model A-30 mod 4 provides only gray code. The mod 8 units provide two
RS 232 outputs along >with gray code. I believe the Garmin 430 and 327 both
accept gray code.
>Mike Akatiff
Indiana with Larry
----- Original Message -----
From: "Robin Wessel" <Robin.Wessel@verizon.net>
Subject: AeroElectric-List: RE: Altitude encoder recommendation?
> --> AeroElectric-List message posted by: "Robin Wessel"
<Robin.Wessel@verizon.net>
>
> I would check out the new version of the venerable ACK A-30 encoder. The
> new version has serial + gray code for the same price. When you buy make
> sure it has mod 4 (ser#85,000 or above).
>
> http://www.ackavionics.com/
>
> robin wessel
> tigard, OR
> RV-6A
>
>
Message 4
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| Subject: | Re: Bob's server costs |
--> AeroElectric-List message posted by: KahnSG@aol.com
Bob
I would gladly like to send a donation to help with the increase in server
costs.
I am sure that others would also contribute to the cause and maybe you could
also upgrade your list computer and a home server.
Steve
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