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  #11  
Old 04-26-2017, 07:43 PM
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RV8JD RV8JD is offline
 
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Quote:
Originally Posted by Canadian_JOY View Post
Again, to put a fine point on it. NO HOMEBUILT BATTERY PACKS for 406MHz ELTs. Period.
Quote:
Originally Posted by RFSchaller View Post
Mark,

Some ELTs use Duracell D cells. That would seem to contradict your conclusion.

Rich
He did say " ... for 406MHz ELTs." Are there any 406 MHz ELTs that use Duracell "D" cells? I'll bet not.

For example, the ACK E-01 ELT (121.5 MHz) did use Duracell "D" cells. But the the ACK E-04 ELT (406 MHz/121.5 MHz) uses a lithium battery pack, and says this:
"DO NOT REMOVE SEALANT FROM BATTERY PACK SCREWS, OR DISASSEMBLE BATTERY PACK .TSO-C142a PROHIBITS OPENING OR REPLACING CELLS. IF THE BATTERY PACK IS OPENED BY ANYONE EXCEPT THE MANUFACTURER IT IS NO LONGER AIRWORTHY, AND THE WARRANTY IS VOID."
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Last edited by RV8JD : 04-26-2017 at 08:36 PM.
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  #12  
Old 04-26-2017, 09:48 PM
Canadian_JOY Canadian_JOY is offline
 
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As Carl so accurately observed, my choice of words was quite intentional. Alkaline D-cells just don't do well when asked to put out the large current spike required for the high transmission power of the 406MHz data burst. As a result there are no 406MHz ELTs which are certified for use with over-the-counter alkaline D-cells.

While it may not be immediately obvious, ELT manufacturers aren't getting super-rich selling ELT's. They rely on the sales of battery packs to provide some on-going income, without which the sale of 406MHz ELT's in the sub-$1000 range would be totally unsustainable.
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  #13  
Old 04-27-2017, 05:37 AM
todehnal todehnal is offline
 
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So, is the Ultralife U10014 the one we need?

I see that there are quite a few "D" cells offered
U10013, U10014, U10015, U10016, etc. Confusing!

Tom
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  #14  
Old 04-27-2017, 06:09 AM
Mich48041 Mich48041 is offline
 
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Part numbers: U10015 and U10016 have solder tabs.
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  #15  
Old 04-27-2017, 08:23 PM
RFSchaller RFSchaller is offline
 
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The term "airworthy" is interesting. We do not certify our experimental aircraft to be airworthy at annual because there is no type certificate we comply with. We certify they are in a condition for safe operation. We can fly with avionics in IMC even if they aren't TSO'd. Why would you conclude the ELT must be TSO'd?
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  #16  
Old 04-30-2017, 05:30 PM
Canadian_JOY Canadian_JOY is offline
 
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Quote:
Originally Posted by RFSchaller View Post
The term "airworthy" is interesting. We do not certify our experimental aircraft to be airworthy at annual because there is no type certificate we comply with. We certify they are in a condition for safe operation. We can fly with avionics in IMC even if they aren't TSO'd. Why would you conclude the ELT must be TSO'd?
Ummm... not to be too argumentative, but we ARE required to use some TSO'd avionics when we fly IFR, or to have verifiable performance in compliance with the TSO. As an example (and, regrettably, a darned expensive one) nobody is flying with a non-TSO'd GPS navigator to do LPV approaches because very, very few people have the capacity to design a device to the same standard as required by the TSO AND demonstrate that it meets the technical and performance standards set out in the TSO.

With respect to ELT's, I won't do all the leg work for you but rather will suggest you peruse some earlier discussions on this topic wherein you will find references to the exact FAR which mandates the carriage of a TSO approved ELT. It does not mandate a 406MHz ELT, but it does mandate a device approved under TSO C91a (for new installations on US-registered aircraft) or any of the versions of TSO C126.
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  #17  
Old 04-30-2017, 10:21 PM
RFSchaller RFSchaller is offline
 
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A Canuck citing FARs?!😝
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  #18  
Old 05-01-2017, 07:17 AM
Canadian_JOY Canadian_JOY is offline
 
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Quote:
Originally Posted by RFSchaller View Post
A Canuck citing FARs?!😝
Almost as funny as an American who remains unaware of FARs, despite the best efforts of others to lead him into the light...
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  #19  
Old 05-01-2017, 07:43 AM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by Canadian_JOY View Post
Almost as funny as an American who remains unaware of FARs, despite the best efforts of others to lead him into the light...
Excellent... need neighbors to our north to help straighten out American politics as well.

And that isn't even funny.
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  #20  
Old 05-01-2017, 10:50 AM
RFSchaller RFSchaller is offline
 
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OK, this is war! We're sending Justin Bieber back!😜
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