PILOT'S GUIDE TOP 10 AVIONICS UPGRADE MISTAKES AND HOW TO AVOID THEM S T O R Y B Y D A L E U S M I T H pgrading aircraft electronics can be extremely exciting for the airplane's owner. Unfortunately, these projects also can be some of the most maddening for both the owner and the avionics repair station. The difference between a celebration and a cerebral hemorrhage can often come down to the well-meaning aircraft owner making one or two seemingly harmless mistakes. To help everyone concerned avoid these time and budget-killing errors, I contacted a cross-section of avionics shops to learn what