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Subject: TSOs and equipment failure
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Hamid writes --

<<What you are saying is that in a system with multiple alternator/batterie=
s and isolated/redundant busses, a TSO's system and a non-TSO's system can =
equally survive an adverse event like a lightning induced power surge or an=
 alternator caused voltage surge. I would strongly disagree with your concl=
usion.>>

Actually I agree completely with Hamid.  Environmental effects such as the =
indirect effects of lightning are precisely where the TSO'd units have an a=
dvantage.  With my electrical power example I was trying to say that there =
are other failure modes (loss of electrical power for a variety of reasons)=
 where the TSO'd unit goes dark just like the non-TSOd unit.

I did envision electrical power surges due to failures in the electrical sy=
stem causing the non-TSOd unit to fail which the TSOd unit might survive.  =
In this case, Hamid is right -- the TSOd unit has an advantage here as well=
.  The lesson is that problems with the fairly mundane portion of our avion=
ics systems (electrical power generation and distribution) can also cause f=
ailures of our whiz-bang EFISs and glass panel displays.  It doesn't take a=
 lightning strike.

- Rob Wolf
Steam gauges in my airplane!



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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>Hamid writes --</div>


<div>&nbsp;</div>


<div><FONT face=3D"Courier New">&lt;&lt;What you are saying is that in a sy=
stem with multiple alternator/batteries and isolated/redundant busses, a TS=
O's system and a non-TSO's system can equally survive an adverse event like=
 a lightning induced power surge or an alternator caused voltage surge. I w=
ould strongly disagree with your conclusion.&gt;&gt;</FONT><br>
</div>


<div>Actually I agree completely with Hamid.&nbsp; Environmental effects su=
ch as the indirect effects of lightning are precisely where the TSO'd units=
 have an advantage.&nbsp; With my electrical power example I was trying to =
say that there are other failure modes (loss of electrical power for a vari=
ety of reasons) where the TSO'd unit goes dark just like the non-TSOd unit.=
</div>


<div>&nbsp;</div>


<div>I did envision&nbsp;electrical power surges due to failures in the ele=
ctrical system causing the non-TSOd unit to fail which the TSOd unit might =
survive.&nbsp; In this case, Hamid is right -- the TSOd unit has an advanta=
ge here as well.&nbsp; The lesson is that problems with the fairly mundane =
portion of our avionics systems (electrical power generation and distributi=
on) can also cause failures of our whiz-bang EFISs and glass panel displays=
.&nbsp; It doesn't take a lightning strike.</div>


<div>&nbsp;</div>


<div>- Rob Wolf</div>


<div>Steam gauges in my airplane!<br>
</div>


<div style=3D"CLEAR: both"></div>
</font>
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