AIR DATA COMPUTER (ADC) SYSTEM FAILURES
Single ADC Failure
If a failure occurs in a single ADC system, the other ADC system will
automatically provide airspeed and altitude 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 ADC
circuit breakers to ensure they are both in. If one is open, try resetting it
(push in). If it pops back out, DO NOT reset it.
The following annunciations will be shown on the PFD:
IAS NO COMP – Only one source for airspeed information, not able to compare to
second source.
ALT NO COMP – Only one source for altitude information, not able to compare to
second source.
BOTH ON ADC 2 (or 1) – Both PFDs are only receiving ADC 2 (or 1) information.
AHRS1 TAS – AHRS 1 is not receiving airspeed information.
Figure 3A-3 – No. 1 ADC Failure (No. 1 PFD Shown, with Optional SVS System On)
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