Hello again:

 

I just finished another flight, and I'm noticing a trend beginning here (this is somewhat new), but I can't figure out what I'm doing wrong, or, that matter, what I'm even doing differently.  I just recently switched to SOP 2; I don't think it started precisely then, but it may have. 

 

Sometime between when I call for the Descent Checklist prior to descent and 10,000 (I know it's not right at descent, but I didn't pay attention to which flow the FO was working on at the time), I get a Master Caution: ELEC.  I look(/pan) up, to discover that my FO has turned off the #1 and #2 ELEC switches.  I summarily turn them back on and continue the approach normally, but I haven't been able to figure out what I'm doing that triggers this.

 

I just went through the SOP 2 Tutorial again and double-checked..  I think I'm doing my flows correctly.  Any idea what might trigger this?  Could I be doing something wrong after giving the FO "control" while I set up for descent?

I did go and check the Failures menu (in the FMC, not the default FS dialog) and confirmed that nothing had failed.  I'm truly stumped here.  Any help appreciated.

Check your CVR log.

 

All I can think of is that the system heard a voice command to turn off those Elec Switches.  You may have coughed or mumbled something and the system interprets that as a command.

 

This is why I recommend enabling Hard Mute if you don't expect to use a voice command for a significant period of time.