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Maintenance Data - Event Recording
 1)  Two non-volatile memories are dedicated to each maintenance subsystem monitored by EICAS. One of these memories is for data stored automatically by EICAS. The other memory is for manually stored data. Manual data storage is initiated by either the flight crew in the air or by the maintenance crew while on the ground. Once data is stored in these memories it cannot be lost, even during electrical power failure.
 2)  The ECS, ELEC, HYD, and APU sets of maintenance subsystem parameters can be automatically recorded by EICAS. This happens when certain messages are initiated by the subsystem. Which messages will cause an automatic recording to be taken, known as an Auto Event, are determined by software programming. Auto Event messages are noted in the message table which appears later in this text. A subsequent Auto Event occurring in these subsystems will be ignored. This leaves the initial failure message and associated values stored in memory.
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MAINTENANCE MANUAL

 3)  The PERF subsystem parameters can also be stored in an auto event. If any primary or secondary engine parameter enters an exceedance area, an auto event is recorded of the PERF format. A subsequent excedance will be ignored unless an exceedance of a higher order occurs. If a parameter on the same engine later has an exceedance of a higher order, a subsequent auto event will be recorded that overrides and erases the previous auto event. The auto events message stored identifies the parameter and level of the exceedance.
 4)  If an auto event occurs for an engine, and an auto event already exists for the other engine, the data that was recorded for the first engine excedance will remain displayed for the first engine, but the new data for the second engine's excedance will be displayed for the second engine. An indication will show in the upper right corner of the display to show the last engine on which an auto event has occurred. You will be able to tell if an auto event has occurred on both engines, because an auto event message will show below both engine indication columns on the PERF/APU page. Environmental data on the PERF/APU page will be updated with the recording of the first and all subsequent auto events.
 5)  Maintenance subsystem parameters can also be manually recorded. This is known as a Manual Event and can be done in two ways. Pressing EVENT RECORD on the display select panel will record all parameters of all subsystems in their respective manual event memories. Pressing REC on the maintenance panel will record all parameters of just the maintenance subsystems currently displayed. The EVENT RECORD button would normally be used by the flight crew while in the air. The REC button can only be used on the ground. Both buttons record subsystem data into the same memory. Subsequent presses of either button will overwrite new data into memory and erase any data previously recorded.
　
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