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hcourier(at)cox.net
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 Posted: Tue May 20, 2008 7:33 pm Post subject: Resistor for trim tab indicator system |
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Hello,
Trying to get the annual completed on the AC-68 (680 FLP) I fly. Does anyone know a source for a 10-200 ohm variable resistor that's used in the trim tab position indicator system? The indicator fluctuates a lot or shows 15 degrees up setting most of the time. Maintenance thinks it's this resistor as it was loose and looked overheated when they inspected the system.
Am also checking with the local avionics folks.
Trying to cover all bases as parts for this plane are sometimes hard to find.
Thank you,
Ray Mansfield
850-217-5185
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rsrandazzo(at)precisionma
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| Posted: Tue May 20, 2008 11:11 pm Post subject: Resistor for trim tab indicator system |
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[img]cid:image001.jpg(at)01C8BAD6.B8D25960[/img]
Ray-
Unfortunately, this is a common fault item in Commanders. The part can be purchased through a Commander Service Center for about $3500. (It is drop shipped from Twin Commander Aircraft Company- but they won’t deal with you directly on the sale…)
We had this problem with N414C, and tried all the various venues for secondary market parts without any luck. Wound up parting with the money.
Be careful with the part- as they are very fragile. Our shop had two of them break during installation- fortunately we were able to avail ourselves of some good customer service from Twin Commander Corporation to take both the broken ones back. We felt that they were defective upon arrival- and after looking them over TCAC agreed.
But it was still an expensive item.
If you have any questions- just shout them out and I’ll do my best to answer for you.
Robert S. Randazzo
N414C
From: owner-commander-list-server(at)matronics.com [mailto:owner-commander-list-server(at)matronics.com] On Behalf Of Ray Mansfield
Sent: Tuesday, May 20, 2008 8:31 PM
To: Matronics List
Subject: Resistor for trim tab indicator system
Hello,
Trying to get the annual completed on the AC-68 (680 FLP) I fly. Does anyone know a source for a 10-200 ohm variable resistor that's used in the trim tab position indicator system? The indicator fluctuates a lot or shows 15 degrees up setting most of the time. Maintenance thinks it's this resistor as it was loose and looked overheated when they inspected the system.
Am also checking with the local avionics folks.
Trying to cover all bases as parts for this plane are sometimes hard to find.
Thank you,
Ray Mansfield
850-217-5185
| | - The Matronics Commander-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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cschuerm(at)cox.net
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| Posted: Wed May 21, 2008 3:55 am Post subject: Resistor for trim tab indicator system |
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Robert S. Randazzo wrote:
| Quote: |
Ray-
Unfortunately, this is a common fault item in Commanders. The part
can be purchased through a Commander Service Center for about $3500.
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I'd be very interested to see this part. If it's a simple wire-wound
form resistor, I know a shop that could likely re-wind them for a modest
fee. I believe if you were to send "specifications and directions"
along with the broken part that such a repair is legal under the "owner
produced parts" section of the FARs. Does anyone have the ability to
email a few pictures to me?
Chris
do not archive
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brcamp(at)windows.microso
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| Posted: Wed May 21, 2008 7:17 am Post subject: Resistor for trim tab indicator system |
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I can't email the pictures, but the description is a wire wound linear variable resistor (I think 500ohm or thereabouts) in a frame with an externally actuated arm controlling the wiper. Replacing or rewinding the resistor would probably fix the problem, though the wiper also should be cleaned and retensioned.
I had this issue with 4186B.
I talked to the company what makes them. They were sympathetic and advised the repair as described.
--
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cschuerm(at)cox.net
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| Posted: Wed May 21, 2008 8:07 am Post subject: Resistor for trim tab indicator system |
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Bruce Campbell wrote:
| Quote: | I can't email the pictures, but the description is a wire wound linear variable resistor (I think 500ohm or thereabouts) in a frame with an externally actuated arm controlling the wiper.
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I vaguely remember that. If the core piece that the wire is wound
around is in good shape, this should be an easy and cheap repair. Some
enterprising person might want to just design a real replacement part
and get a PMA on it even. This place could probably do the job with ease:
http://www.classic-coil.com/classic-coil/index.htm
Chris
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dongirod
Joined: 11 Dec 2006
Posts: 140
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| Posted: Wed May 21, 2008 9:26 am Post subject: Resistor for trim tab indicator system |
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I think several of us Commander owners might be in need of this part, if it
can be reproduced economically.
Don
---
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moe-rosspistons(at)hotmai
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| Posted: Wed May 21, 2008 12:40 pm Post subject: Resistor for trim tab indicator system |
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Hi Folks,
Yes, an economically produced part could probably be sold to several of us.
Having said that, after 28 years of flying aircraft that did not have a good
functioning trim indicator, would I ever remember to look at it?
Moe
N680RR
680Fp
--------------------------------------------------
From: "Don" <dongirod(at)bellsouth.net>
Sent: Wednesday, May 21, 2008 10:23 AM
To: <commander-list(at)matronics.com>
Subject: Re: Resistor for trim tab indicator system
[quote]
I think several of us Commander owners might be in need of this part, if
it can be reproduced economically.
Don
---
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lloyd silverman
Joined: 02 Sep 2007
Posts: 25
Location: MOUNT VERNON,NY
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| Posted: Wed May 21, 2008 6:41 pm Post subject: Resistor for trim tab indicator system |
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MOE, 40+ YEARS AGO I WORKED AT A COMPANY THAT MANUFACTURED AN ALMOST
IDENTICAL PART FOR GRUMAN. THE WIRE WAS "EVANOHM MANUFACTURED BY
WIBUR DRIVER CO. OR AN EQUAL BY DRIVER HARRIS CO. THE TEMP COEF WAS
20 PPM/DEG C. WIRE SIZE WAS .010 , I DONT REMEMBER # OF TURNS BUT 500
OHMS IS CORRECT. (REMEMBER ALLTHAT BUT WHAT DID I HAVE FOR BREAKFAST
THIS MORNING?). THE SUBSTRATE WAS EPOXY BOARD ,SIMILAR TO G10.
SHOULD BE RATHER SIMPLE FOR ANY AMBITIOUS ELEC ENGR OR TECH TO REPAIR
THEM. RGDS,6290X 500B ,LLOYD SILVERMAN
On Wed, May 21, 2008 at 4:35 PM, Moe-rosspistons
<moe-rosspistons(at)hotmail.com> wrote:
[quote]
<moe-rosspistons(at)hotmail.com>
Hi Folks,
Yes, an economically produced part could probably be sold to several of us.
Having said that, after 28 years of flying aircraft that did not have a good
functioning trim indicator, would I ever remember to look at it?
Moe
N680RR
680Fp
--------------------------------------------------
From: "Don" <dongirod(at)bellsouth.net>
Sent: Wednesday, May 21, 2008 10:23 AM
To: <commander-list(at)matronics.com>
Subject: Re: Resistor for trim tab indicator system
>
>
> I think several of us Commander owners might be in need of this part, if
> it can be reproduced economically.
>
> Don
> ---
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_________________
LLOYD SILVERMAN |
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