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Date: Wed, 16 Feb 2011 19:55:37 -0500
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Subject: Re: [LML] Re: follow up on Legacy pitch trim speed
From: paul miller <paul@tbm700.com>
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I have determined that this Lancair panel uses a Precise Flight built  =
Lancair Trim Board Logic box 080A0017 rev.b.  There are no schematics or =
instructions with this box which is unusual--just the pin outs.    There =
are separate power feeds for pitch and roll circuits to this box and a =
ribbon cable leads from the yoke switches and the box figures out what =
to do with the servos.  Inside this box, there are two beautiful circuit =
boards with variable pots and adjustable voltage regulators.  It would =
be nice to have that schematic if this circuit can indeed regulate the =
speed of the Ray Allen servos.  I'm hoping the LM regulators simply have =
to be set down to the proper voltage.  I have written Lancair Avionics =
and Precise Flight--so far no joy.

If anyone has info on this box, it would save a lot of headaches for a =
few Lancairs I'm sure.

Paul
N357V
On 2011-02-16, at 2:10 PM, Ron Jones wrote:

> Excellent. Thanks.
>=20
> I had numerous wiring problems with my Lancair panel and wiring =
harness. I'm slowly tracking them down and fixing. It was mostly the =
wiring harness.=20
>=20
> Ron Jones
>=20
> Sent from Ron's iPhone ...
>=20
> On Feb 16, 2011, at 11:55 AM, paul miller <paul@tbm700.com> wrote:
>=20
>> I know why the potentiometer doesn't work and you probably have the =
same 3-channel trim board that feeds the trim servos.  Once I get the =
correct wiring tested I'll give it to you to look at.
>>=20
>> Paul
>> N357V
>>=20
>> On 2011-02-16, at 9:17 AM, Ron Jones wrote:
>>=20
>>> I had my panel wired at Lancair, too. I also have the adjustable pot =
for pitch trim. It does absolutely nothing. When I called Lancair to =
complain, they suggested it would make a difference under air loads. =
Really? How do I test that? The fact is that it just doesn't work. Never =
has. Is it wired incorrectly? Don't know.
>>>=20
>>> Still, the airplane is quite flyable as is. I, too, merely "bump" =
the trim switch when in cruise. It's darn sensitive, but you get used to =
it. At pattern speeds, it's not a problem.
>>>=20
>>> Could I get it switched off in a timely manner in the case of a =
runaway? Good question.
>>>=20
>>> Ron Jones
>>> www.legacy-innovations.com=20
>>> ron@legacy-innovations.com
>>>=20
>>> Sent from Ron's iPad . . .
>>>=20
>>> On Feb 16, 2011, at 4:53 AM, paul miller <paul@tbm700.com> wrote:
>>>=20
>>>> Determined a properly setup 12v trim will take about 30 seconds =
full up to full down in a Legacy. That sounds about right and Ed =
Martin's Legacy here is working the right way. Mine and others at 6 =
seconds means that you have about 3 seconds from level flight to full =
deflection in a runaway.  That's not enough to activate the safety =
cutout or manually find a disconnect.  On a night approach or close to =
the ground that just isn't going to be detectable before things go =
wrong.  So, I'm still looking for the right wiring, I had my panel wired =
by Lancair Avionics but the box that controls the trim has no label and =
the pot that is supposed to control speed only stops the pitch trim so =
it isn't working properly.  We'll get it right but 6 seconds isn't safe =
imo.
>>>>=20
>>>> Paul
>>>> Legacy 186
>>>> Spruce Creek
>>>> --
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http://mail.lancaironline.net:81/lists/lml/List.html
>>>=20
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>>=20
>>=20
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>=20
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