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Dynon d180 Question

J

jh7850jh

Member
Tried to fly the rv12 today. Red alert bar showed high CHT. Green CHT indicators were jumping back and forth from about 200 to 230. Had never happened before. What to check?
 
This type of symptom is most likely be an intermittent connection to the CHT sensor(s)

Look for Dsub pins that have slightly pushed out of the connector and poor crimp connection at the CHT sensor connectors.
 
If I remember correctly, there are splices in the CHT wires on the engine side of the firewall. Check those too.
 
Thanks for the responses . It seems strange to think of a loose wire or bad connection, since BOTH sides went high at the same time---one or two minutes after takeoff. Could it be some setting or problem in the D180??
 
When strange unexpected electrical problems occur, electrical grounding is suspect. Here is a quote from the D-180 installation manual:
Because of the current drawn by the FlightDEK-D180, even very small resistances between battery ground and instrument ground can cause voltage differences which adversely affect engine sensor readings. An easy way to test the quality of the instrument?s ground is to measure voltage between the ground pin at the FlightDEK-D180 and the ground lead at your aircraft?s battery. With the FlightDEK-D180 powered on, connect one lead of your voltmeter to a free ground lead coming from the FlightDEK-D180. Connect the other lead of your voltmeter to the ground terminal of your battery. The voltage between these two points should measure very close to 0 mV (within 5 mV). If it does not, you must improve the ground connection between the ground of your battery and that of your avionics bus.
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I had a bad detector about 50 hours ago. The replacement from Dynon was also bad.

Joe is probably right. If both indications have gone squirrelly the ground connection is probably to blame.
 
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