 I-level AT's are usually assigned to fleet readiness centers on shore or aircraft intermediate maintenance departments aboard ships.The most challenging and demanding specialty that AT's can have is to be a calibration technician.Without properly calibrated gear such as test sets, oscilloscopes, spectrum analyzers, frequency counters, meters, gauges, thermometers, torque wrenches, and transducers, the rest of the maintenance ratings, for aircraft and ships alike, would not be able to do their jobs effectively.