3A-4 ABNORMAL NAVIGATION SYSTEM FAILURES
ATTITUDE HEADING REFERENCE SYSTEM (AHRS)
FAILURES
Single AHRS Failure
If a failure occurs in a single AHRS system, the other AHRS system will
automatically provide attitude and heading information to both displays if
the aircraft ground speed is greater than 30 Kts. If the aircraft ground speed
is less than 30 Kts, the G1000 system will not automatically revert to the
secondary source and will need to be switched manually. Check the AHRS
circuit breakers to ensure they are both in. If one is open, try resetting it
(push it in). If it pops back out, DO NOT reset it.
The following annunciations will display on the PFD:
HDG NO COMP – Only one source for heading information, not able to compare to
second source.
ROL NO COMP – Only one source for roll information, not able to compare to
second source.
PIT NO COMP – Only one source for pitch information, not able to compare to
second source.
BOTH ON AHRS 2 (or 1) – Both PFDs are receiving AHRS 2 (or 1) information.
HDG FAULT – AHRS 1 (or 2) magnetometer fault has occurred.
Figure 3A-1 – No. 1 AHRS Failure (No. 1 PFD Shown, with Optional SVS System On)
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