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frequencies as well as displaying warning/status annunciations on
aircraft 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 PWR 1 circuit breaker on the ESS
BUS 1 and the 5-amp PFD PWR 2 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 automated 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 Multifunction Display
The Multifunction Display, located above the center console, depicts
navigation, terrain, lightning, traffic data, NAV/COM frequencies, and
annunciation information. All engine data is displayed on a dedicated
ENGINE page. When the ENGINE page is not shown, all essential
engine information 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 PWR 1 circuit breaker on the
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-69
MAIN BUS 3 and the 5-amp MFD PWR 2 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.
GCU 478 Flight Management System Keyboard
The Flight Management System Keyboard is found on the upper
section of the center console and is the primary interface for avionics
system data entry, PFD/MFD operation, NAV/COM tuning, and
heading, course and altitude selection.
28 VDC for Flight Management System Keyboard operation is
supplied through the 5-amp KEYPADS / AP CTRL circuit breaker on
MAIN BUS 1.
GRS 77 Attitude and Heading Reference System (AHRS)
The Attitude and Heading Reference System (AHRS) unit(s), mounted
behind the PFD, provide aircraft attitude and heading information to
both the PFD and the primary Air Data Computer. The AHRS units(s)
contain advanced sensors (including accelerometers and rate
sensors) and interfaces with the; primary Magnetometer to obtain
magnetic field information, the Air Data Computer to obtain air data,
and both Integrated Avionics Units to obtain GPS information.
28 VDC for AHRS 1 operation is supplied through the 5-amp AHRS 1
circuit breaker on the ESS BUS 1. If option installed, 28 VDC for
AHRS 2 operation is supplied through the 5-amp AHRS 2 circuit
breaker on the MAIN BUS 2.
GDC 74A Air Data Computer (ADC)
The Air Data Computer, mounted behind the instrument panel to the
right of the MFD, processes data from the Pitot/static system and
outside air temperature (OAT) sensor(s). This unit provides pressure
altitude, airspeed, vertical speed and OAT information to the
Integrated Avionics System, and communicates with the primary PFD,
Integrated Avionics Unit, AHRS units. The Air Data Computer is also
connected directly to the Outside Air Temperature probe and Pitot-
Static System.
28 VDC for Air Data Computer operation is supplied through the 5-
amp ADC 1 circuit breaker on the ESS BUS 1.
March 2010
7-70 Information Manual
Section 7 Cirrus Design
Airplane and Systems Description SR22
Figure 7-16
Perspective Integrated Avionics System (Sheet 1 of 2)
1 11
Legend
1. Soft Keys
2. PFD
3. PFD Range/Pan Joystick
4. Barometric Pressure
5. COM Transceiver Selection & Tune
6. COM Frequency Transfer
(& 121.5 Emer Tune)
7. COM Volume and Squelch
8. Display Backup Selection
9. NAV and ID Audio Volume
10. NAV Frequency Transfer
2
13 14 15
3 4 5 6 7 8 9 10 12
19 20 21
1
16 17 18
SR22_FM07_2808A
11. NAV Transceiver Selection & Tune
　
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