(2)
The top display unit is used to display the primary engine format and level A, B, and C alert messages. The bottom display unit is used to display the secondary engine, status, or maintenance formats. All formats can be shown on either display in the event of a single unit failure. A compacted format is used when both primary and secondary engine parameters need to be displayed.
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MAINTENANCE MANUAL
(3)
The EICAS display units provide a multicolor (red, yellow, cyan (light blue), magenta (pink), white, and green) CRT presentation of EICAS data. Video display and deflection signals from the EICAS switching modules are provided to drive the CRTs. Manual and automatic intensity signals are provided from the display select panel and from remote light sensors. Temperature sensor circuits and monitor circuits are also included to provide signals to the EICAS computers for BITE monitoring. The display units require 115 Vac, 400 Hz single phase power.
(4)
A local integral light sensor is located on each display unit in the upper right hand corner of the front panel. Each local sensor provides an automatic dimming signal to both display units. The integral light sensors require 0-5 Vac, 400 Hz single phase airplane power.
G. EICAS Maintenance Panel
(1)
The EICAS maintenance panel provides for selection of ground maintenance displays. It has momentary pushbuttons for display selection, memory control, and self-test. The maintenance panel functions only on the ground. The panel is located on the right side panel (P61).
(2)
The DISPLAY SELECT switches control which maintenance page is to be displayed. These switches are the ECS/MSG, ELEC/HYD, PERF/APU, CONF/MCDP, and ENG EXCD (for EXC format). When a DISPLAY SELECT switch is pressed, its respective maintenance data format is displayed. In addition, the ECS/MSG switch is used to cycle through additional maintenance messages, if necessary.
(3)
The EVENT READ buttons allow display of pre-recorded maintenance data. After a maintenance display page has been selected, pressing an EVENT READ button will display data recorded for that page. Pressing AUTO displays data recorded automatically by the EICAS system. Pressing MAN displays data that has been recorded manually with either the EVENT RECORD or REC buttons.
(4)
The REC button is used to record maintenance data in non-volatile memory. When REC is pressed, the parameters of only the maintenance page that is currently displayed are stored in memory. Data previously stored manually is lost.
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