BRT Knobs

• UPR/LWR - Sets the brightness of the Upper or Lower EICAS CRT displays to be maintained by the automatic brightness control system.
• LWR Inner Knob - Selects brightness of Weather Radar display when the ND display is selected on the Lower CRT.

Event RCD Button
When Pushed records up to 5 maintenance events into non-volatile memory.

EIU Selector
Selects EIU providing information to EICAS.

• AUTO - Selects the left EIU with center and right automatically selected if the left computer fails.
• L, C, R - Manually selects the EIU.

HDG Reference Switch
Selects the heading reference for the PFDs, NDs, AFDS and FMCs.

• TRUE - References true north.
• NORM - References magnetic north or true north depending in aircraft type.

FMC Master Selector
Selects the FMC source for FCCs, EECs and VHF navigation radio tuning information.