The Maintenance and Administration Subsystem (MAS) is the central management point for the EAGLE.

The MAS provides user interface, maintenance communication, peripheral services, alarm processing, system disk interface, and measurements.

Management and redundancy is provided by use of two separate subsystem processors.

The MAS resides on two separate sets of Maintenance and Administration Subsystem Processor (MASP) cards and a Maintenance Disk and Alarm card (collectively referred to as control cards). The control cards are located in slots 1113 through 1118 of the EAGLE Control Shelf.