3A-16 P/N 13772-005
Section 3A Cirrus Design
Abnormal Procedures SR22T
Flight Displays Too Dim
1. INSTRUMENT dimmer knob.............. OFF (full counter-clockwise)
If flight displays do not provide sufficient brightness:
2. Revert to standby instruments.
Amplification
The instrument dimmer knob provides manual dimming control of the
display screens, key and text backlighting, flap and Environmental
Control System (ECS) status indicators, and standby instruments.
Rotation of the dimmer knob fully counterclockwise disables the
dimmer, and reverts to daytime lighting for all components.
In daytime lighting (knob OFF/full counterclockwise):
•Standby instruments, all Avionics system keypads and the
bolster switch panel are unlit
• MFD and PFD screen illumination is controlled by automatic
photocell (providing full brightness in high light conditions, only
slightly reduced by darkness)
• ECS and control panels are backlight and their status lights at
maximum intensity
With active dimming (knob moved clockwise), the full bright position
(full clockwise) applies maximum illumination to keys and switches, to
standby instruments and to status lights, but the PFD/MFD screen
illumination is at a substantially reduced level (levels still appropriate
for night flight). Maximum screen illumination (appropriate for daytime
use) is with the dimmer OFF/full counterclockwise.
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