I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 134
FOR SIMULATION USE ONLY – NOT A TRAINING AID
The LGT NIGHT/DAY/AUTO HUD switch establishes the MFD brightness mode that is
outputted to the MFDs. The DAY/NIGHT SEL controls the MFD day/night illumination.
NIGHT illumination, at its full brightness setting, is approximately 10% of the full
brightness presented during DAY mode.
The FWD LGT NIGHT/DAY/AUTO HUD switch works in conjunction with the HUD
brightness knobs to control the HUD symbology brightness. The AFT UFCP LGT
NIGHT/DAY/AUTO HUD switch has no AUTO HUD control functionality.
When the front UFCP LGT NIGHT/DAY/AUTO HUD brightness mode switch is in the
AUTO HUD position, the brightness mode is set to AUTO HUD. The AUTO HUD
position, when selected, only impacts the brightness associated with the HUD.
When AUTO HUD position is selected, the lighting associated with MFDs and UFCP
display windows operate in the DAY mode. If NIGHT mode is selected in either
cockpit, the MFDs and UFCPs in the whole aircraft are placed into the night mode.
When the LGT NIGHT/DAY/AUTO HUD brightness mode switch is in the DAY position
in both cockpits, the brightness mode is set to DAY.
If the FWD or AFT LGT NIGHT/DAY/AUTO HUD selection switch is set to DAY and the
other cockpit is set to NIGHT, then the FWD and AFT UFCP and MFDs are set to
NIGHT.
When both UFCP LGT NIGHT/DAY/AUTO HUD switches are placed to DAY mode from
the NIGHT position, the DAY illumination reverts to the lowest possible DAY setting
to avoid a sudden burst of illumination from night conditions.
The NIGHT position is intended for use during night and low light operation. When
one or both of the FWD and AFT LGT NIGHT/DAY/AUTO HUD brightness mode
switches is in the NIGHT position, the brightness mode shall be set to NIGHT.
NOTE
Cycling the LGT NIGHT/DAY/AUTO HUD brightness mode switch from day to
night and back to day will put MFD brightness at its lowest (DIM) daylight
setting.
MFD brightness must be adjusted manually using the individual MFD bezel
switches.
The HUD text window enable and FPM cage switch has three positions: HUD TEXT;
FPM UNCAGE, and CAGE.
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