7-58
P/N 13772-005
Section 7
Cirrus Design
Systems Description
SR22T
Interior Lighting
Interior lighting for the airplane consists of separately controlled
incandescent overhead lights for general cabin lighting, individual
lights for the pilots and passengers, and dimmable panel floodlights.
The flight instrumentation and avionics equipment lights are dimmable.
Instrument Lights
Instrument lighting for the airplane includes: Primary Flight and
Multifunction Display backlighting and bezel, bolster switch panel,
audio panel keys, FMS keyboard, and optionally installed GMC 705
AFCS Control Unit, incandescent lights in the standby instrument
bezels, key backlighting and status lighting for the flap and
Environmental Control System (ECS) control panels. Associated
lighting is adjustable through the INSTRUMENT dimmer control on the
instrument panel bolster. The dimmer is OFF when rotated fully
counterclockwise, all systems revert to daytime lighting in this position
(not full DIM).
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.
The instrument light circuits operate on 28 VDC supplied through the
5-amp CABIN LIGHTS circuit breaker on MAIN BUS.
Panel Flood Lights
A string of red LEDs mounted under the instrument panel glareshield
provide flood lighting for the instrument panel. The lights are controlled
through the PANEL dimmer control on the instrument panel bolster.
Original Issue
