S
ECTION
3: E
MERGENCY
P
ROCEDURES
C
IRRUS
D
ESIGN
I
NTEGRATED
A
VIONICS
S
YSTEM
E
MERGENCIES
SR20
3-30
P/N 11934-005
Integrated Avionics System Emergencies
A “Red X” through any electronic display field, such as COM frequencies,
NAV frequencies, or engine data, indicates that display field is not
receiving valid data.
Attitude & Heading Reference System (AHRS) Failure
Air Data Computer (ADC) Failure
1. Verify Avionics System has switched to functioning AHRS.
If not, manually switch to functioning AHRS and attempt to bring failed
AHRS back on-line:
2. Failed ADAHRS Circuit Breaker............................................................ SET
If open, reset (close) circuit breaker. If circuit breaker opens again, do
not reset.
3. Be prepared to revert to Standby Instruments (Attitude, Heading).
Procedure Complete
• N
OTE
•
Failure of the Attitude and Heading Reference System (AHRS) is
indicated by removal of the sky/ground presentation and a “Red
X” and a yellow “ATTITUDE FAIL” shown on the PFD. The
digital heading presentation will be replaced with a yellow “HDG”
and the compass rose digits will be removed. The course pointer
will indicate straight up and course may be set using the digital
window.
1. Failed ADAHRS Circuit Breaker............................................................ SET
If open, reset (close) circuit breaker. If circuit breaker opens again, do
not reset.
2. Revert to Standby Instruments (Altitude, Airspeed).
3. Land as soon as practicable.
Procedure Complete
• N
OTE
•
Complete loss of the Air Data Computer is indicated by a “Red X”
and yellow text over the airspeed, altimeter, vertical speed, TAS
and OAT displays. Some FMS functions, such as true airspeed and
wind calculations, will also be lost.
Reissue A