Today's Message Index:
----------------------
1. 10:54 AM - Re: TSO - vs NON-TSO (N55XS)
2. 11:20 AM - Re: Pull type aircrat Circuit Breakers and other types.... (Ron Davis)
3. 11:24 AM - Re: TSO - vs NON-TSO (Ron Davis)
4. 11:31 AM - Re: TSO - vs NON-TSO (Ron Davis)
5. 11:37 AM - Re: TSO - vs NON-TSO (Ron Davis)
Message 1
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| Subject: | Re: TSO - vs NON-TSO |
--> Avionics-List message posted by: N55XS <topglock@cox.net>
Tim & Diane Shankland wrote:
>--> Avionics-List message posted by: Tim & Diane Shankland <tshank@megsinet.net>
>
>I'm not sure where you're buying your altimeter, but from Aircraft
>Spruce the difference between a TSO ($409) and non TSO ($189) sensitive
>altimeter is substantial to my budget.
>
>Tim Shankland
>
>W J R HAMILTON wrote:
>
>
>
>>--> Avionics-List message posted by: W J R HAMILTON <wjrhamilton@optusnet.com.au>
>>
>>Folks,
>>My reaction is: There is so little difference in price, and given that a
>>non TSO altimeter only meets unknown standards, why bother.
>>Think in terms of the cost of the altimeter as a percentage of the total
>>cost of the aircraft, then thing of all the ways you can get into trouble
>>with a miss-reading altimeter.
>>Cheers,
>>Bill Hamilton.
>>
>>
>>At 06:46 21/12/2004, you wrote:
>>
>>
>>
>>
>>>--> Avionics-List message posted by: "Maureen & Bob Christensen"
>>><mchriste@danvilletelco.net>
>>>
>>>
>>>I'm trying to decided whether to buy a TSOed Sensitive Altimeter or
>>>NON-TSOed?
>>>
>>>My concern is accuracy (obviously) and Pitot/Static System Checks.
>>>
>>>Are NON-TSOed Altimeters accurate enough to pass the test?
>>>
>>>Has anyone researched this issues?
>>>
>>>I will be operating some IFR.
>>>
>>>Thanks,
>>>Bob Christensen
>>>RV-8 Builder - SE Iowa
>>>
>
>
>
>
Tim,
I bought the $189 version from ACS. Very Very smooth movement and
accurate, as the actual test sheet shows no more that a 5 foot deviation
at altitude. As I live very close to the airport, I check the
barometric presssure that ATIS provides and set the Altimiter. The
resulting altitude comes up right, everytime. I plan to fly with it
taped to the dash so I can compare its performance to the TSO'd unit in
the plane. I have a feeling that it will do fine...
--
Jeff - A055
Primed the doors, avionics panel and windscreen surround, today...
--
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Message 2
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| Subject: | Re: Pull type aircrat Circuit Breakers and other types.... |
--> Avionics-List message posted by: "Ron Davis" <l39parts@hotmail.com>
Yes, it is good to cycle the breakers periodically. Breaker designs can be
magnetic, heat operated, or electronic (Zlan or arc fault). Heat types
mechanically move a trip lever (bi-metal, hot wire, or melting solder) to
allow the spring to quickly open the contacts.
Zlan types actually have a power converter, and microprocessor inside to
think about what's going on and when to trip. They go against the old rule
of thumb to use fuses to protect equipment and breakers to protect wires.
Most low amperage aircraft breakers are of the hot wire type. They are more
expensive and fail more often because it's harder to design a device to use
a small current to physically move the trip lever. The contacts and other
parts still have to interrupt a fault current which can be up to 3500 amps.
Think of it this way: It's harder to find a small air leak than a big one.
Message 3
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| Subject: | Re: TSO - vs NON-TSO |
--> Avionics-List message posted by: "Ron Davis" <l39parts@hotmail.com>
Yes, non-TSO'd altimeters will pass the static test and are accurate enough
to match the blind encoder for the transponder check. The pitot isn't
connected to the altimeter. Non-TSO'd altimeters work fine for VFR/IFR
flight and are completely legal for flight under part 91.
Message 4
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| Subject: | Re: TSO - vs NON-TSO |
--> Avionics-List message posted by: "Ron Davis" <l39parts@hotmail.com>
>Folks,
>My reaction is: There is so little difference in price, and given that a
>non TSO altimeter only meets unknown standards, why bother.
>Think in terms of the cost of the altimeter as a percentage of the total
>cost of the aircraft, then thing of all the ways you can get into trouble
>with a miss-reading altimeter.
>Cheers,
>Bill Hamilton
A TSO is paperwork, not parts. Of course you need a TSO'd unit to fly under
part 135 in a T-34...
Message 5
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| Subject: | Re: TSO - vs NON-TSO |
--> Avionics-List message posted by: "Ron Davis" <l39parts@hotmail.com>
>I do tax and accounting for an FAA certificated instrument shop.
>"NonTSO" has no more meaning for an altimeter than if they said
>"contains no additives nor preservatives." If a mfr does not produce
>a TSO'd version, it could be oriental junk. If they do (and who
>does?), to produce a TSO and a nonTSO'd version of an altimeter costs
>the same, if it's of the same design. If you're paying substantially
>less, how can you be sure of what you're getting?
>
>Reg,
>Fred F
You could install it and have a certificated repair station test it, sort of
like the regs require. Do you believe that aviation alternator belts are of
better quality than automotive? The cost difference is a factor of 20 for
belts whose sole difference IMHO is the word "aircraft" rubber-stamped on
the expensive one.
It's quite possible to build a good-working copy of an altimeter in a
Chinese factory and sell it cheap if you don't spend millions certifying it
to the FAA.
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