Stephen Skinner

Wanted Brittian BI805 Control Valve

Recommended Posts

In Oshkosh last week I picked up the Accu-Track II. To make my system work I need the BI805 Control Valve part # 20464-200.

Please let me know if someone has one to sell.

 

20464-200.png

Share this post


Link to post
Share on other sites

*Members that donate $10 or more do not see advertisements*

Good luck...they are hard to find. Keep an eye on the new low-cost digital autopilots that are coming out.

Share this post


Link to post
Share on other sites

Hi @Stephen Skinner,

I'm also looking to install a heading and or Nav tracker upgrade to my Positive Control system.  While speaking with Brittain few weeks ago, I learned that in addition to the BI-805 option, there is an option to replace our Britain turn coordinator with a version that includes the required valve from the BI-805  This route makes the separate BI-805 valve not required.  The upside to this approach is that the turn coordinators are more common on the market than the straight BI-805 (and you don't have to find another place to mount the BI-805!) The downside is that this configuration does require a field approval, but Brittain (or I) can provide some example field approvals to show that there is a precedent, and we also have a letter from Brittain stating that the configuration is approved by the original manufacturer (Brittain).

I also confirmed with Brittain that the 14 and 28 volt versions of these units are easily able to be converted in either direction (to the other voltage) during the service/refurbishment process, so the voltage rating does not pose a problem if all you can find is a 28 volt one.

I was able to find a turn coordinator on ebay the first time I looked, and I bought it.  Am about to send it to Brittain for refurbishment and bundling with the rest of the parts required.  

All of the above information is based on a series of emails and calls I had with Cecilia and Kevin at Brittain in Tulsa a few weeks ago.  They are super-helpful and I recommend checking in with them for confirmation of this information and to ask any other questions you might have.  Cecilia even offered to review any units before I purchased them.  I sent her pictures of the ebay unit and she confirmed I had the right one before I bought it.

I'll message you with a link to another unit that appears to be for sale in case this is a route you would like to consider.

Good luck!

-Sia

 

 

  • Like 2

Share this post


Link to post
Share on other sites

Typical MSer...

Has a challenge, contacts supplier, gets answer, shares the details... :)

Well done SIA!

Best regards,

-a-

  • Like 2

Share this post


Link to post
Share on other sites

@Stephen Skinner, I just messaged you the info.  Keep us updated on how the process goes.  Also, as @N6758N points out, there are compelling next-generation autopilot solutions coming to market that may warrant our attention. I've decided I'm going to look more into this option before I spend on upgrading my existing vacuum-based system.

 

  • Like 1

Share this post


Link to post
Share on other sites
On ‎8‎/‎3‎/‎2017 at 8:50 PM, SkyTrekker said:

@Stephen Skinner, I just messaged you the info.  Keep us updated on how the process goes.  Also, as @N6758N points out, there are compelling next-generation autopilot solutions coming to market that may warrant our attention. I've decided I'm going to look more into this option before I spend on upgrading my existing vacuum-based system.

 

 

Attached is the response from Cecilia Henderson at Brittain Industries.

 

I understand the servo valve is difficult to come by, other pilots on the look-out have begun to refer to it as “the unicorn”.  We are hopeful that this situation changes soon.

 

Okay, here is the thing.  The Brittain turn coordinator, model TC100EVT, does in fact utilize the same valve technology as the servo control valve.  Therefore, it can be used to install B-11 Accu-Trak and/or B-12 Accu-Flite in lieu of the servo control valve.  This is NOT an STC’d installation of the product and to be installed legally in this manner would require an FAA Field Approval.  This has been done in recent years on a few Mooney’s in different parts of the country (i.e. different FSDO’s). 

 

Now as for the TC100EVT gyros.  There are three generations of gyros primarily different cosmetically only.  The P/N 2911 being offered at Hangarswap is a second generation TC100EVT.  This means it has a pendulum inclinometer and no electric flag.  The latest generation TC100EVT has a fluid ball inclinometer and an electric off flag.  Otherwise, fit, form and function are the same.  The unit you linked us to has a good valve for interconnect to the B-11/B-12 systems and the only unknown we can think of is a question of the rotor.  It is possible the unit contains what my technicians call a “split rotor”.  If this is true we would not be able to repair the unit.  This is unknown until we open the case.  So if we assume it DOES NOT have a split rotor, sight unseen and untested we estimate the cost to repair the unit to manufacturers specifications and convert it back to 14v around $750.00 (incidentally there is a small modification we make to the unit when we know it will be used as the servo valve for the B11/B12, we then nomenclature the gyro with an “NP” to indicate this modification has been made).  So $750.00 plus the $250.00 core cost to Hangarswap puts you at $1000.00 for a second generation TC100EVT turn coordinator.

 

If you are serious about this course of installation we have on our shelf a third generation TC100EVT (fluid ball, electric off flag) in yellow tagged condition, already modified for use with the B11/B12, we would sell to you outright (no core) for $1540.00.  If accepting delivery of an Accu-Trak and/or Accu-Flite system in addition to this gyro purchase we would give you a discounted price of $1232.00 on the gyro.  This option makes the cost of the B-11 Accu-Trak $788.92 (new controller, new installation hardware and tubing, installation manuals, flight manuals and STC).  The cost of the B-12 Accu-Flite system is $2583.02 (overhauled DG, Switch and Cable Assy., new DG Adaptor, new installation hardware and tubing, installation manuals, flight manuals and STC).  We also have some example 337’s to share with your installer if needed in assistance of the field approval.  The add-on pricing is good regardless of which TC100EVT you elect to purchase and all components are on the shelf except an overhauled DG which we can find or you can locate yourself, just let me know (knocks $900.00 off the price of the Accu-Flite making it $1683.02).

 

 

Share this post


Link to post
Share on other sites

@Stephen Skinner, thanks for the follow up and additional info from Brittain.   That all sounds consistent with my conversations with them.  I started out fully intending to upgrade my Brittain Positive Control to the B-11 or B-12 system.  But I'm considering waiting for the new breed of APs now.  The folks at Brittain are really top-notch, though, so I wouldn't have any hesitation having them upgrade my PC system if I weren't considering different approach.

Share this post


Link to post
Share on other sites

There is one on eBay

Brittain Autopilot Accu Trak II B11, BI 805 Servo Controller. Yellow tag BI805

Edited by MooneyPTG

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now