Corrosion sensors offer the opportunity to switch from calendar-based to conditioned-based maintenance schedules and thereby significantly reduce the cost of aircraft ownership. This paper presents an evaluation of a corrosion sensor in regards to the correlation of its output to real world corrosion damage, and its sensitivity and durability. The corrosion behavior of several aerospace aluminum alloys was compared to sensor output. Specimens/sensors were exposed in laboratory prohesion tests. The results of weight loss measurements are presented along with the results of experiments aimed at determining the sensitivity and durability of the sensor system. Keywords: corrosion, sensors, bimetallic, conductivity, aircraft