Intermittent JPI issues

[bcg]

I've had my amp probe go squirrely a few times now.  It gives me a "BAD PROBE" error and then starts doing this.  Usually, the next flight it works just fine.  Anyone have any ideas?  It worked perfectly for a year or so and nothing changed recently that should have caused this.

 

 

[PT20J]

The "probe" should just be a shunt. The shunts don't generally go bad, and if it did it would disconnect the battery from main bus. But there are two wires that run from the shunt to the engine monitor. I'd look for loose connections between the shunt and the JPI. 

[47U]

12 hours ago, bcg said:

Anyone have any ideas? 

I apologize in advance for the thread drift.  But, here’s an idea.  

You might consider putting a guarded cover on the ‘Chem Trail’ toggle switch.  Per the STC installation instructions (I’m positive).  

Is your chem trail hopper measured in oz, lbs, or gallons?  And, what kind of spray set up?  A simple ‘relief tube’ disguise, I suspect.  How do you get your C high enough to create the proper disguised ‘contrail’?  Is there a thrust component benefit with actuation to get you high enough?  

Is this STC still active?  Where can I go to get one?  One of the 3-letter agencies, I suppose?

[bcg]

6 hours ago, 47U said:

I apologize in advance for the thread drift.  But, here’s an idea.  

You might consider putting a guarded cover on the ‘Chem Trail’ toggle switch.  Per the STC installation instructions (I’m positive).  

Is your chem trail hopper measured in oz, lbs, or gallons?  And, what kind of spray set up?  A simple ‘relief tube’ disguise, I suspect.  How do you get your C high enough to create the proper disguised ‘contrail’?  Is there a thrust component benefit with actuation to get you high enough?  

Is this STC still active?  Where can I go to get one?  One of the 3-letter agencies, I suppose?

 

The new systems are required to be on at all times (hence both positions are ON) so the guarded switch isn't needed anymore.  We measure loading in gallons and it's injecting into the exhaust for proper atomization and dispersal at low altitude.  It allows a more targeted distribution, which certain agencies really prefer.  I put mine in when I did my avionics upgrade and the grant money provided for installing it covered most of the labor for the entire upgrade.  There are several different agency contracts going right now, though not as many as with the last administration.  The "Mind Control" formula is paying the best at the moment and almost covers my fuel costs.  I've had some ethical concerns about it but, avgas is expensive and you've got to save where you can.  I can't really divulge too much about who is financing and providing the chemicals other than to say that it's likely who you would expect and a couple of others you may not have heard of before.  They'll probably contact you since you've expressed interest, dealing with "They" has been easy, I haven't much enjoyed interactions with "Them" though so ask around the hangar before getting on board with a program to see what others think of it.