Cirrus SR22 Pilot Operating Handbook page 354

Section 9
Supplements
Heading Miscompare
HDG MISCOMP Caution
For dual AHRS installations, heading difference is greater than 6°
between AHRS 1 and AHRS 2.
1. Heading....... CROSS-CHECK AHRS1 against Magnetic Compass
2. AHRS2 .............................................................................. SELECT
a. Press SENSOR softkey on PFD, followed by AHRS2 softkey
b. Expect USING AHRS2 message on PFD
3. Altitude ........ CROSS-CHECK AHRS2 against Magnetic Compass
4. AHRS .......................................................... SELECT more reliable
a. Press SENSOR softkey, then select the AHRS that provided
the most reliable heading indication
Pitch Miscompare
PIT MISCOMP Caution
For dual AHRS installations, pitch difference is greater than 5°
between AHRS 1 and AHRS 2. Flight Director, Autopilot, and ESP (if
installed) will not be available when pitch miscompare exists.
1. Pitch ......CROSS-CHECK AHRS1 against Stdby Attitude Indicator
2. AHRS2 .............................................................................. SELECT
a. Press SENSOR softkey on PFD, followed by AHRS2 softkey
b. Expect USING AHRS2 message on PFD
3. Pitch ......CROSS-CHECK AHRS2 against Stdby Attitude Indicator
4. AHRS .......................................................... SELECT more reliable
a. Press SENSOR softkey, then select the AHRS that provided
the most reliable pitch indication
5. UNRELIABLE AHRS CIRCUIT BREAKER ............................ PULL
Pulling circuit breaker for unreliable AHRS will clear miscompare
condition, but will result in 'NO PIT/ROLL/HDG COMPARE'
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HDG MISCOMP
PIT MISCOMP
Cirrus Design
SR22 / SR22T
P/N 13772-135
Revision 04: 09-08-14