Definition

An Engine Monitoring Unit (EMU) is a digital display that shows various parameters such as RPM, oil temperature, oil pressure, battery voltage, fuel pressure, fuel flow, fuel quantity, exhaust gas temperature, and turbine inlet temperature. 

Description

In modern glass-cockpit airplanes, EMUs replace the older system of separate analog gauges for each engine parameter. The data appears in a single line-replaceable unit, which eases a pilot’s scan for the status of various aircraft systems. Sometimes referred to as engine analyzers, some EMUs can display color-coded data to help a pilot quickly identify problems. For example, system data in the normal range will be displayed in green, data in the caution range will be displayed in yellow, and data out of limits will be displayed in red. Some units also include aural warnings.