Cirrus SR22 Pilot Operating Handbook page 279

C D
IRRUS ESIGN
SR22
GDU 1050A Primary Flight Display (PFD), 10-inch, or GDU
1250A, 12-inch (Optional)
The Primary Flight Display, located directly in front of the pilot, is intended
to be the primary display of flight parameter information (attitude,
airspeed, heading, and altitude) during normal operations. The PFD
accepts data from a variety of sources, including the MFD and the Inte-
grated Avionics Units through a high-speed data bus connection. In
conjunction with Flight Management System Keyboard, the PFD also
controls and displays all communication and navigation frequencies as well
as displaying warning/status annunciations on airplane systems. During
engine start, reversionary operation (MFD failure), or when the DISPLAY
BACKUP switch is selected, engine system information is displayed on the
PFD.
Redundant power sources provide 28 VDC for PFD operation. Power is
supplied through the 5-amp PFD A circuit breaker on ESS BUS 1 and the
5-amp PFD B circuit breaker on MAIN BUS 2. Either circuit is capable of
powering the PFD. System start-up is automatic once power is applied.
Power-on default brightness is determined by ambient lighting and is user
adjustable. Typical alignment time is 60 seconds from battery turn on.
Display Backup Mode
In the event of a detected display failure, the Integrated Avionics System
automatically switches to Display Backup Mode. In Display Backup Mode,
all essential flight information from the PFD is presented on the remaining
display in the same format as in normal operating mode with the addition
of the Engine Indicating System. The change to backup is completely auto-
mated and no pilot action is required. However, if the system fails to detect
a display problem, Display Backup Mode may be manually activated by
pressing the red DISPLAY BACKUP Button. Pressing this button again
deactivates Display Backup Mode.
GDU 1050A Multifunction Display (MFD), 10-inch, or GDU
1250A, 12-inch (Optional)
The Multifunction Display, located above the center console, depicts navi-
gation, terrain, lightning, traffic data, NAV/COM frequencies, and annun-
ciation information. All engine data is displayed on a dedicated ENGINE
page. When the ENGINE page is not shown, all essential engine informa-
tion is shown on an Engine Strip at the edge of the display.
Redundant power sources provide 28 VDC for MFD operation. Power is
supplied through the 5-amp MFD A circuit breaker on MAIN BUS 3 and
the 5-amp MFD B circuit breaker on MAIN BUS 1. Either circuit is capable
of powering the MFD. System start-up is automatic once power is applied.
Power-on default brightness is determined by ambient lighting and is user
adjustable.
P/N 13772-006
Reissue A
S 7: A
ECTION IRPLANE AND
S
YSTEMS
A
VIONICS
7-73