edneff
Well Known Member
I posted about this in August, but I have some further data points now.
I have been trouble shooting this for awhile and cannot seem to find the link between the electrical equipment and the engine indications.
Aircraft RV-7
Avionics: Garmin suite, G3X GDU 370 and GDU 375, GSU 73, GTN 650, GDL 39, GMC 305, PAR1000EX COM/NAV2 and audio panel, G3X displays powered from Backup Battery when Aircraft Master or Avionics Master is in the off position.
Symptom:
Temperature Engine indications of CHT and EGT will go down when certain electrical equipment is turned on.
Indications seem normal with Avionics Master on: (approximate) CHT 330, EGT 1000, turning the Avionics Master on or off has no effect on the engine readouts.
Turning Landing lights on, CHT drops by 110 degrees, EGTs by 300
With landing lights on, turning off Avionics master switch, CHT rises 50 degrees, EGT also rises.
Turning on Pitot Heat causes a similar drop in both CHT and EGT.
Turning on strobes alone causes some dancing up and down of the EGT's.
Strobes are Aero LED's Pulsars.
Suggestions welcome.
I have been trouble shooting this for awhile and cannot seem to find the link between the electrical equipment and the engine indications.
Aircraft RV-7
Avionics: Garmin suite, G3X GDU 370 and GDU 375, GSU 73, GTN 650, GDL 39, GMC 305, PAR1000EX COM/NAV2 and audio panel, G3X displays powered from Backup Battery when Aircraft Master or Avionics Master is in the off position.
Symptom:
Temperature Engine indications of CHT and EGT will go down when certain electrical equipment is turned on.
Indications seem normal with Avionics Master on: (approximate) CHT 330, EGT 1000, turning the Avionics Master on or off has no effect on the engine readouts.
Turning Landing lights on, CHT drops by 110 degrees, EGTs by 300
With landing lights on, turning off Avionics master switch, CHT rises 50 degrees, EGT also rises.
Turning on Pitot Heat causes a similar drop in both CHT and EGT.
Turning on strobes alone causes some dancing up and down of the EGT's.
Strobes are Aero LED's Pulsars.
Suggestions welcome.