• DU 3 from ESS 1 bus via the DISPLAY – MFD PLT circuit breaker
• DU 4 from ESS 2 bus via the DISPLAY – PFD PLT circuit breaker
NOTE
Copilot’s DUs power inputs are connected to ESS 1 and ESS 2
buses when the aircraft is on the ground or when starting an engine.
The brightness of each DU is manually adjusted via the DU Dimming control
panel located on the central console. Each DU is also provided with an
ambient light sensor to automatically adjust the brightness of the LCD as
ambient light varies.
DU lighting is polarized; hence pilots must not wear polarized sunglasses
when flying.
Each DU is provided with an internal electrical fan which is automatically
operated and an internal temperature sensor which monitors the possible
overheating of the DU.