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  #1  
Old 06-28-2020, 08:00 AM
Joe Joe is offline
 
Join Date: Oct 2005
Location: Independence, OR
Posts: 390
Default Trutrak ADI repair?

Is anyone repairing the long-obsolete Trutrak ADI? My 2-1/4 inch unit recently went Tango Uniform and it fills a need for backup in my glass panel.


As most know, Trutrak Flight Systems was swallowed by Bendix-King some time ago. I'm not holding a lot of hope that B-K will be helpful.
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Joe Dubner
RV-8A
Independence, OR
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  #2  
Old 06-28-2020, 06:25 PM
wnplt wnplt is offline
 
Join Date: Feb 2013
Location: Idaho
Posts: 171
Default

If not I see them for sale on here often. I have one and really like it. Was thinking one time about changing it to a AV-20 but heard some scary things about the AHRS in them.
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  #3  
Old 06-28-2020, 07:43 PM
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SmilingJack SmilingJack is offline
 
Join Date: Dec 2010
Location: Hilton Head Island
Posts: 1,069
Default Mid-Continent

Joe,

Did you contact Mid-Continent?

trutraksupport@mcico.com / (800) 821-1212
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John Mastro
RV-8
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  #4  
Old 06-28-2020, 11:44 PM
Lars Lars is offline
 
Join Date: Nov 2005
Location: Davis, CA
Posts: 1,137
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Describe the failure. I repaired mine, after being told it couldn't be fixed. It was a little fiddly but in my case, I got the required part (an RC servomotor) from Amazon for a few bucks.
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Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
880+ hours as of December 1, 2019. Where did the time go?
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  #5  
Old 06-29-2020, 07:55 AM
Joe Joe is offline
 
Join Date: Oct 2005
Location: Independence, OR
Posts: 390
Default

Quote:
Originally Posted by SmilingJack View Post
Did you contact Mid-Continent?

trutraksupport@mcico.com / (800) 821-1212
I did not know Mid-Continent handled TruTrak repair but just fired off an email. Thanks.

Quote:
Originally Posted by Lars
Describe the failure. I repaired mine, after being told it couldn't be fixed. It was a little fiddly but in my case, I got the required part (an RC servomotor) from Amazon for a few bucks.
The climb rate indicator line (don't know what else to call it) was hung up near its maximum. The roll rate indicator seemed to be OK. I'm happy to know an RC servo is available (that thing looked tiny but obviously I don't know anything about RC).

Yesterday afternoon I opened the unit and found the the pitch rate mechanism to be binding with a small amount of debris nearby. Cleaned as best I could and lubed (LPS 1 with a cotton swab). Seems to be functioning -- for now.

Quote:
Originally Posted by wnplt
Was thinking one time about changing it to a AV-20 but heard some scary things about the AHRS in them.
That was also my first thought but I wasn't keen on being an early adopter of the AV-20. Nor of spending a kilobuck just to get back to where I was.

Three great replies with good info. Thanks, guys.
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Joe Dubner
RV-8A
Independence, OR
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  #6  
Old 06-29-2020, 09:54 AM
Ethanol1 Ethanol1 is offline
 
Join Date: Oct 2007
Location: MN
Posts: 60
Default trutrak

I have one for sale if your interested.

Mike
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Mike York
President EAA Ch 25
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  #7  
Old 07-07-2020, 07:20 AM
Joe Joe is offline
 
Join Date: Oct 2005
Location: Independence, OR
Posts: 390
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Quote:
Originally Posted by Joe View Post
... Yesterday afternoon I opened the unit and found the the pitch rate mechanism to be binding with a small amount of debris nearby. Cleaned as best I could and lubed (LPS 1 with a cotton swab). Seems to be functioning -- for now.
Following up my own post for the archives:

The cleaning/lubrication seemed to do the trick. Ops checked during two flights and the ADI is its normal self again.

Good thing too, because although Mid-Continent and BendixKing tech support each promptly responded to my email requests, they were of absolutely no help. Mid-Continent replied that they no longer repaired this instrument but offered to sell me a new Xcruze 100 autopilot for a discount. (My unit is not an autopilot.) BendixKing sent me two auto-generated emails with no substance that I could determine. Sheesh!
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Joe Dubner
RV-8A
Independence, OR
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  #8  
Old 07-07-2020, 10:10 AM
jbDC9 jbDC9 is offline
 
Join Date: Jan 2005
Location: Houston, TX
Posts: 840
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Reading this makes me glad I ditched my TruTrak stuff.
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John Bixby
RV-8 QB sn 82030 - 1650 hrs
O-360-A1D/CS/Pmags
Houston, TX
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  #9  
Old 07-07-2020, 11:40 AM
philb philb is offline
 
Join Date: Apr 2005
Location: Salt Lake City
Posts: 163
Default

I had a problem with a freewheeling roll trutrak servo on my -10.

Email to bendix, got the autoreply to contact mid-continent.

Emails (3) to mid-continent and phone calls (2) until talked to live person led to being told that more expensive to repair, and I should buy a new one.

Bought the new one, then decided had nothing to lose by taking apart the old one and troubleshooting. The roll pin attaching the gear to the shaft had backed out. Just have to find a roll pin and I've got a backup. Don't know why i didn't do it sooner.

Disposable society i guess. Midcontinent did manage to sell me a $5.00 "special mounting washer" which turned out to be a plain old AN-960 flat washer....

Phil
RV-10
Salt Lake City (Bountiful KBTF)
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