Flight Displays Too Dim - Cirrus SR20 Pilot Operating Handbook

Cirrus Design
SR20

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 the
event of a dimmer control circuit failure, or to override the manual
dimming circuit, pull the CABIN LIGHTS circuit breaker.
In daytime lighting (knob OFF/full counterclockwise, or with CABIN
LIGHTS circuit breaker pulled):
• Electro-mechanical standby instruments, all avionics system
keypads and the bolster switch panel are unlit
• MFD, PFD, and MD302 Standby Attitude Module (optional)
screen illumination is controlled by automatic photocell
(providing full brightness in high light conditions, only slightly
reduced by darkness)
• ECS and control panels are backlit and their status lights are 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, and
MD302 Standby Attitude Module (optional) 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.
P/N 21399-004 P/N 21399-004
Revision A1
Section 3A
Abnormal Procedures
3A-15 3A-15