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This checklist vets the electrical system; does not include all required checks for flight.
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ActionVerification RequiredNoteEngineMain MasterAux MasterCrossfeedMain AlternatorAux AlternatorPri ECUBku ECUPri CoilpackBku CoilpackPri PumpBku PumpAdvance / LOPInjector ECU
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Engine start
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1Fuel selector valve left or right.
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2Propeller to takeoff setting.
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3Inj ECU to pri.
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4Mixture nominal.
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5Advance / LOP switch off.
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6Throttle to idle.
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7Crossfeed on.
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8Aux master on.Main bus voltage 12.0 to 13.0.Crossfeed is demonstrated to work with main master off.
The left and right Skyview EFIS screens automatically power on and bring the EMS with them.
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9Main master on.
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10Aux master off.Aux bus voltage 12.0 to 13.0.Crossfeed is demonstrated to work with aux master off.
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11Aux master on.
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12Pri ECU on.We turn the ECU on first to let it boot before turning on the coilpack. A progressive ECU/Ignition Coil switch is used.
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13Pri coilpack on.Leaving the bku ECU and coilpack off verifies, when we start the engine, that the injector relays are not stuck in the bku state.
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14Pri Pump on.45 psi, check engine light on, main and aux volts warn lights on.With a fuel pump on the battery voltage should drop below 12.5 so we can verify the check engine and volts warn lights work.
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15Advance / LOP switch on.Advance / LOP light on.Checking Advance / LOP light works.
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16Advance / LOP switch off.Advance / LOP light off.
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17Crossfeed at will.Crew preference for engine start.at will
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18Propeller area clear.
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19Start engineSkyview backup battery will keep it booted and if no backup battery it will work down to 6V for ten seconds.
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20Crossfeed offCrossfeed must be off for the engine bus feed diode check steps that follow.

Crossfeed is normally off so a spike won't trip both crowbars; also an electrical fault on one side does not take the other side out.
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21Main alternator on.Main bus voltage 14.0 to 14.4.
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22NoneEngine bus voltage 0.2 to 0.6 V less than main bus.Checking main engine bus feed diode is not open or shorted.
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23Aux alternator on.Aux bus voltage 14.0 to 14.4.
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24Main alternator off.Main bus voltage 12.0 to 13.0.Main alternator must be off for the next step.
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25NoneEngine bus voltage 0.2 to 0.6 V less than aux bus.Checking aux engine bus feed diode is not open or shorted.
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26Main alternator on.Main bus voltage 14.0 to 14.4.
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27Bku ECU on.We turn the ECU on first to let it boot before turning on the coilpack. A progressive ECU/Ignition Coil switch is used.
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28Bku coilpack on.
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29Inj ECU to bku.
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30Pri ECU and coilpack off.Engine continues to run.This proves the injector relays are not stuck in the pri state.
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31Pri ECU on.We turn the ECU on first to let it boot before turning on the coilpack. A progressive ECU/Ignition Coil switch is used.
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32Pri coilpack on.
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33Inj ECU to pri.
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Note 1)
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Runup
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1Throttle to 1,700 RPM.
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2Pri Coilpackoff.RPM drop 50 to 125.
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3Pri Coilpack on.RPM comes back up.
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4Bku Coilpack off.RPM drop 50 to 125. Pri and bku drops withing 50 RPM of each other.
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5Bku Coilpack on.RPM comes back up.
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6Cycle prop.500 rpm drop.
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7Bku pump on.
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8Pri pump off.45 PSI fuel pressure.
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9Pri pump on.
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10Throttle to idle
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Takeoff
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1NoneMixture nominal.
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2NoneAdvance / LOP switch off.
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3NonePropeller at takeoff setting.
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4Throttle full
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Cruise
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1Bku pump off.
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2Advance / LOP at will.at will
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Approach and land
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1Bku pump on.
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2Mixture nominal.
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3Advance / LOP switch off.
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Taxi
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1Bku pump off.
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Engine shut-down
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1Main master off.Engine running.
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2Aux master off.Engine running.
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3Pri ECU and coilpack off.Engine stops.
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4Bku ECU and coilpack off.
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5Pri pump off.Crossfeed off.
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Color CodeRed is on
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Black is off
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Green is Injectors on Primary ECU
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Yellow is injectors on Backup ECU
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Notes:
1) At completion of Engine Start Checklist we have verified:
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 Main master works.
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 Aux master works.
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Crossfeed works with Main Master off.
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Crossfeed works with Aux Master off.
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 Pri alternator works.
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 Bku alternator works.
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 Pri ECU works for ignition.
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 Pri ECU works for injectors.
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 Bku ECU works for ignition.
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 Bku ECU works for injectors.
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Main engine bus feed diode is not open or shorted.
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Aux engine bus feed diode is not open or shorted.
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Pri Coilpack works but RPM drop test will be at runup.
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Bku Coilpack works but RPM drop test will be at runup.
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Pri pump works. (Bku pump test will be at runup.)
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Injector relays work in both primary and backup states.
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2) Author is john_s_bright@yahoo.com
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