Today's Message Index:
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1. 03:20 AM - Re: Z14 with SDS EFI... (gtae07)
2. 05:15 AM - Re: Re: Z14 with SDS EFI... (Charlie England)
3. 08:47 AM - Re: Z14 with SDS EFI... (Dennis Glaeser)
Message 1
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| Subject: | Re: Z14 with SDS EFI... |
ceengland7(at)gmail.com wrote:
> Not a requirement, but a 'typical' consideration is being able to shut down the
entire electrical system (even the engine's electrical power) in case of fire
or emergency (potential crash) landing for other possible reasons. Lots of
switches/fuses/breakers do make that harder to manage in an emergency. Not saying
don't do it; just do it with eyes open. My choice is one bus, with two ways
to power it. I can take my system down with one *carefully placed* motion.
That's the other thing I'm weighing out. I've accidentally killed the master switch
before in another airplane (turbulence). The engine was conventional (carb/mag)
but thanks to a latent fault in the EFIS backup battery that kept it
from activating, I killed everything. That wasn't a big deal as I was VFR, but
I don't want one switch accidentally taking down the entire engine. I suppose
a way around that would be to go with my last option and just put heavy-duty
switches on the engine bus, but that's another failure point...
I suppose the question is, which is more likely--a latent component/connection
failure killing power to the engine, or there's a situation where I need to kill
power but can't?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=471182#471182
Message 2
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| Subject: | Re: Z14 with SDS EFI... |
On Thu, Jul 20, 2017 at 5:19 AM, gtae07 <icebrain@gmail.com> wrote:
>
>
> ceengland7(at)gmail.com wrote:
> > Not a requirement, but a 'typical' consideration is being able to shut
> down the entire electrical system (even the engine's electrical power) in
> case of fire or emergency (potential crash) landing for other possible
> reasons. Lots of switches/fuses/breakers do make that harder to manage in
> an emergency. Not saying don't do it; just do it with eyes open. My choice
> is one bus, with two ways to power it. I can take my system down with one
> *carefully placed* motion.
>
>
> That's the other thing I'm weighing out. I've accidentally killed the
> master switch before in another airplane (turbulence). The engine was
> conventional (carb/mag) but thanks to a latent fault in the EFIS backup
> battery that kept it from activating, I killed everything. That wasn't a
> big deal as I was VFR, but I don't want one switch accidentally taking down
> the entire engine. I suppose a way around that would be to go with my last
> option and just put heavy-duty switches on the engine bus, but that's
> another failure point...
>
> I suppose the question is, which is more likely--a latent
> component/connection failure killing power to the engine, or there's a
> situation where I need to kill power but can't?
>
> Agreed on the inadvertent shutdown issue, but my way of dealing with that
is, I guess, ergonomics. The 'kill everything' switches are kept away from
any other commonly used switches/controls, and out of reach of any
passenger, unless they reach completely across the pilot.
Message 3
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| Subject: | Re: Z14 with SDS EFI... |
I have an all electric engine (Subaru) and put locking switches on both the main
and aux ignitions and fuel pumps. Solves the inadvertent bumping issue.
All of my switches mounted low, and Up=On, so inadvertent bumps typically turn
things on, not off. You can also use switch guards...
I have an SDS ignition as well - one unit for all 6 EFIs and ignitions (coil on
plug). Dual power feeds (one from each battery) through diodes to the SDS unit.
The ignition and fuel pumps are powered directly from the respective battery bus
(Main and Aux).
My electrical architecture is very close to Z-14 (mine was done before Z-14 was
published).
I've been flying 9 years with no issues (that I didn't cause myself, like leaving
the master on :x )
Dennis Glaeser
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=471201#471201
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