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Pinpoint AHRS Update

 
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Tim(at)MyRV10.com
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PostPosted: Tue Jun 06, 2006 9:49 pm    Post subject: Pinpoint AHRS Update Reply with quote

For those who are closely watching the Chelton/Crossbow AHRS recall, and
waiting for info on the Pinpoint GADAHRS that will be substituted for
the Crossbow, I wanted to post a small update.

I got my unit last week, and got it all installed before my trip to
Yellowstone. From an installation perspective, it is not too much
work to install, especially if you prepare. With the Chelton supplied
wiring harness, they plan to locate your AHRS unit behind the panel,
as it has a remote magnetometer that can mount elsewhere, such as
in the wing. The other component that needs to be mounted is the
OAT probe, necessary because the pinpoint also contains a complete
air data computer. If you are already using another EIS for your
air data, like I'm using my Grand Rapids EIS6000 (chelton version),
there is special wiring you can do to accomodate both sets of air data,
so contact D2AV or me for information if you're in this position.
Nothing too complex. The other difference is that it requires you
to plumb a pitot and static line to the AHRS unit, as this is needed
for Air Data, of course. The AHRS box also has a GPS antenna connector,
so consideration should be given to mounting it near the antenna.

For me, the install went very easily, with the only real big change
being the fact that the new wiring diagram lists using 3-conductor
shielded and not using any shields for signal grounds. So if you're
awaiting a pinpoint unit, just make sure you have at least one
3-conductor cable pulled between the AHRS and the screens. It is
also used between the AHRS and the MSU. The rest can be 2-conductor
shielded. I won't go into any more detail on the install right now
though, but this is just a head's up to give people who are waiting
a couple of tips. You will also want to plan ahead for how you
are going to get your pitot and static lines there.

In my install, I have the AHRS on the same forward tail shelf
as the last one. I put the OAT probe next to the access plate
under the right wing, and for the magnetometer I couldn't decide
between the wingtip or the tail, but ended up thinking it would
be easiest for me to mount in the aft section of the tail, on a
2nd shelf, above the elevator pushrod. I figured this would give a
great location from a ferrous metal, and electrical perspective.

I know the big question is, how does it work. Well, I can say that
there are currently a few people, using various types of aircraft, who
have installed the unit and are test flying it right now. We are on
the "demolition team" to test it in a few various small aircraft types,
and determine if there is anything we can do to cause it to not work
properly. It's being done in owner-built planes, to ensure that
even substandard mounting and wiring won't throw the thing way out
of whack....hopefully mine isn't too substandard. Wink Being an AHRS
that was generated from the Boeing/Airbus type aircraft systems, it
needs to be tested in smaller aircraft to ensure all is well. If
all goes well, it can be released for production deliveries, and if
anything needs to be checked, it can be retested as needed by the
team to ensure all will be well when it's delivered.

I only fill you in on this so that you all know that even though
you may not have heard anything lately, there is stuff going on
right now, and progress is being made towards getting them out
the door.

As for how it's working for me, I have put about 11-12 hours on it
in the past few days, and have found nothing at all that I can question
about it. I was not overly disappointed in the crossbow, as the only
things that ever happened to me is that I couldn't get it to boot
about 10 or 12 times, and in-flight it performed fine. But I can say
that this one is performing every bit as good as the Crossbow. I've
tried many various attitude maneuvers, some pretty extreme, and
I've not seen anything negative yet. I'm almost disappointed, as
being part of a team to "break" something, I was hoping I'd be more
useful in helping them test and perfect it. At any rate, I know
I was always wondering what the heck was going on, and why we heard
about it so long ago, but saw nothing in our hands. I figured I
should write and let you know that I can now say there is
progress. I am told that after I/we have tested it completely that
they'll be retiring these original units and re-shipping us all
completed production units with any required updates installed,
post-retesting, of course.

You can ask me any questions offline if you wish, but I can't go
into much detail during the testing period. I'm sure they want
to make sure that everything that is said is accurate, including
any install info. But, I can maybe at least help keep you pointed
in the right direction for when you get the pinpoint.

--
Tim Olson - RV-10 N104CD - Flying
do not archive


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JeffreyKidd
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PostPosted: Thu Apr 11, 2019 4:10 am    Post subject: Re: Pinpoint AHRS Update Reply with quote

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Joined: 23 Jan 2021
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