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fklein(at)orcasonline.com
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 Posted: Tue Nov 08, 2011 1:55 pm Post subject: Altimeters; TSO vs. Non-TSOed |
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I'm about to purchase back up "steam gauge" altimeter and ASI; 2.25"
UMA instruments are preferred mfg'r.
Anyone care to opine as to the merits of buying TSOed or Non-TSOed
gauges?
Thanks in advance,
Fred
A194
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jeff(at)rmmm.net
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| Posted: Tue Nov 08, 2011 2:12 pm Post subject: Altimeters; TSO vs. Non-TSOed |
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Cost. Thats about it Fred... 
Jeff R. N128LJ Gold Rush
On Nov 8, 2011, at 3:49 PM, Fred Klein wrote:
| Quote: |
I'm about to purchase back up "steam gauge" altimeter and ASI; 2.25" UMA instruments are preferred mfg'r.
Anyone care to opine as to the merits of buying TSOed or Non-TSOed gauges?
Thanks in advance,
Fred
A194
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| | - The Matronics Europa-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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rlborger(at)mac.com
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| Posted: Tue Nov 08, 2011 3:24 pm Post subject: Altimeters; TSO vs. Non-TSOed |
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Fred,
I agree with Jeff. I went with all non-TSO 2 1/4" UMA backup gages in my panel rebuild.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger(at)mac.com
On Nov 8, 2011, at 4:08 PM, Jeffrey Roberts wrote:
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Cost. Thats about it Fred...
Jeff R. N128LJ Gold Rush
On Nov 8, 2011, at 3:49 PM, Fred Klein wrote:
>
>
> I'm about to purchase back up "steam gauge" altimeter and ASI; 2.25" UMA instruments are preferred mfg'r.
>
> Anyone care to opine as to the merits of buying TSOed or Non-TSOed gauges?
>
> Thanks in advance,
>
> Fred
> A194
>
>
>
>
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h&jeuropa
Joined: 07 Nov 2006
Posts: 645
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| Posted: Wed Nov 09, 2011 5:34 am Post subject: Re: Altimeters; TSO vs. Non-TSOed |
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Fred,
Prior to retirement I owned and operated a screen printing business that was dedicated to printing dials for aircraft instruments. Our customers were all the repair shops and some manufacturers of aircraft instruments. I attended many industry trade shows and listened to technical presentations about instruments as well as having many friends that I consulted with while building our Europa.
From all this I learned that an altimeter is a very complex instrument and the performance requirements that it has to meet are very tight (look at FAR 43 Appendix E Altimeter system test & inspection). Likewise gyro instruments (altitude indicator and DG) also are complex and have very tight performance requirements.
What a TSO really ensures is that a quality control system is in place when an instrument is manufactured or serviced.
So I would purchase TSO'd altimeter or gyro instrument. Pressure instruments like airspeeds are much less complicated and I would have no problems with a non TSO unit.
There is a reason many repair shops will not work on non TSO'd altimeters and gyros. Their experience is that they cannot be repaired and depended on to continue to meet the performance requirements. Its not worth the time nor their reputation to attempt to work on them.
In our case, we are using GRT EFIS and EIS. We purchased the altimeter and airspeed option in our EIS to serve as our backup instruments. An electronic instrument like the EIS is much more capable of meeting the performance requirements and doing it on a consistent and long term basis.
Hope this is helpful.
Jim Butcher
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AirEupora
Joined: 01 Nov 2009
Posts: 186
Location: Dixon, CA
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| Posted: Wed Nov 09, 2011 7:20 am Post subject: Re: Altimeters; TSO vs. Non-TSOed |
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I bought brand new TSO'ed instruments as I'm planning on flying IFR when I need to. If you are not planning to fly IFR then Non-TSo'ed instrument would work.
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fklein(at)orcasonline.com
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| Posted: Wed Nov 09, 2011 12:22 pm Post subject: Altimeters; TSO vs. Non-TSOed |
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Jim...thanks for your insights...one never knows the depth of
experience and information accessible on this list...Fred
On Nov 9, 2011, at 5:34 AM, h&jeuropa wrote:
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Fred,
Prior to retirement I owned and operated a screen printing business
that was dedicated to printing dials for aircraft instruments. Our
customers were all the repair shops and some manufacturers of
aircraft instruments. I attended many industry trade shows and
listened to technical presentations about instruments as well as
having many friends that I consulted with while building our Europa.
> From all this I learned that an altimeter is a very complex
> instrument and the performance requirements that it has to meet are
> very tight (look at FAR 43 Appendix E Altimeter system test &
> inspection). Likewise gyro instruments (altitude indicator and DG)
> also are complex and have very tight performance requirements.
What a TSO really ensures is that a quality control system is in
place when an instrument is manufactured or serviced.
|
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