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01-15-2018, 12:04 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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I misspoke in post #4. My EFIS is off during engine start, but my EIS (engine instruments - GRT puts them in a separate box) is on (GRT says this is okay), and a bright red light is also on until there is oil pressure.
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01-15-2018, 02:00 PM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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I power on my dual Dynon 1000T EFIS prior to startup. Both screens have backup batteries to deal with low voltage during engine start. Dynon confirms this is no problem for their system (as do other MFGs). I can power one or both screens on without the master but rarely find a need to do so.
The AD-AHRS receive power from the EFIS in this system so, by the time it is booted up, the system is ready to roll.
I have no analog gauges to monitor oil pressure or anything else during engine start. (KIS)
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Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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01-15-2018, 02:05 PM
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Join Date: Oct 2007
Location: In New Braunfels, ist das Leben schön!
Posts: 871
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Quote:
Originally Posted by Raymo
I power on my dual Dynon 1000T EFIS prior to startup. Both screens have backup batteries to deal with low voltage during engine start.
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Same and zero problems in 500+ hours. Started with just one screen but went to both after seeing what a non-issue it was.
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Larry New
RV-7A - Built, flying 900+ hrs
RV-10 - Built, flying 2.9 hrs
??? - RV-12, Subsonex
48 States in 7 Days!
VAF Paid - Annual Autodraft
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01-15-2018, 02:09 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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While testing, I would power cycle my Dynons in flight and they would align just fine.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 01-15-2018 at 06:29 PM.
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01-15-2018, 06:18 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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KISS.
No avionics master switch. Master switch ON provides power to everything (I do have the E-buss architecture a la Aeroelectrics).
I just leave everything on and start the engine (since I need the EMS portion of the EFIS visible, at least). EFIS stays on through the resulting voltage sag, because it has a backup battery. Other devices like GNS430W, etc., will reboot. No big deal. (ETA: if you're worried about it, which you shouldn't be, you can always turn radios and such off with their Power/volume knobs at shutdown, then turn them on after engine start).
Way simpler, fewer failure points, and I get engine monitoring during the start like you should.
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2019 Dues paid!
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01-15-2018, 06:26 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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I start with everything on and taxi when I'm ready. The brownout on start and alignment while I taxi have not made any difference that I can tell.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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01-15-2018, 06:58 PM
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Join Date: Jun 2010
Location: Sydney, Australia
Posts: 123
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Any modern decent quality EFIS "should" be able to cope with being on during engine start, though some manufacturers seem to be a bit paranoid in this area despite saying everything fully complies with DO-160 etc.
In my case the engine is started with compressed air, so having avionics on during start via the master switch is a no brainer, but even if I had electric start I would do it the same way, as I'm firmly in the camp which believes having engine instrumentation during engine start is highly desirable.
My EFIS also has a lightning fast alignment and GPS acquisition, and will be aligned before I've finished the before start procedures. The latest generation are getting very good in this respect.
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Mike
Down Under
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01-15-2018, 07:13 PM
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Join Date: Nov 2010
Location: ____
Posts: 829
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"In my case the engine is started with compressed air," So either you are flying an AIR HOG. or an MP14 ?
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01-15-2018, 07:13 PM
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Join Date: Dec 2010
Location: Floyds Knobs, IN
Posts: 633
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Does every GRT have 2 power inputs?
My Sport SX200 does and it makes this dead simple.
The diode action is internal to the GRT EFIS. Hook up power pin the normal way and a second battery on a switch to the other power input. The EFIS takes the higher voltage without a brownout/restart. Turn off the small battery after engine start. Same overall as post #7, save for a diode and resistor run to the backup battery from the main bus to charge it while it is normally unused in flight.
By small second battery I mean 12V SLA 800mAh
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RV-6, bought from builder.
O-320, slider, carb, mags, FP
Last edited by moosepileit : 01-15-2018 at 07:21 PM.
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01-15-2018, 08:33 PM
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Join Date: Jun 2010
Location: Sydney, Australia
Posts: 123
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Quote:
Originally Posted by F1R
"In my case the engine is started with compressed air," So either you are flying an AIR HOG. or an MP14 ?
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M14P.
All the battery does for start is open a solenoid valve (and powers the ignition coils). Puts a quick end to any "don't start with your avionics on" arguments! 
__________________
Mike
Down Under
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