I recently upgraded my 2nd-owner LNC2-235 with
dual Dynon Skyview EFIS. When completed, I discovered that each time the gear
motor runs, the output of the networked sensors (GPS, EMS, and ADAHRS) gets
interrupted, resulting in red X’s displayed on screen. When the gear
cycle is complete, the EFIS returns to normal. Testing with the EFIS system
power isolated from the aircraft’s electrical system by operating only on
their independent backup batteries resulted in the exact symptom.
From that I concluded that RF from the pump motor must be
interfering with the sensor signals. I then rerouted all sensor leads as far
from the pump as possible, but still had only incremental improvement.
Now I’m thinking about ways of shielding the pump and
it’s wiring in an effort to reduce their RF output. What I would like to
know is if anyone knows how to best accomplish this, and, if after reading
this, anyone sees an alternate possibility of what could be causing the
problem.
Thanks in advance for any feedback you might have for me.
Kevin Gregory
LNC2 – 235 / KHND