Dual ADC Failure (Red “X” – All Air Data Indications)
If both ADC systems fail, check that both ADC circuit breakers are pushed in.
If one or both are open, try resetting them (push in). If they pop back out DO
NOT reset them. Airspeed and altitude information will not be displayed on
the PFD; therefore, the standby airspeed indicator and standby altimeter will
have to be referenced for airspeed and altitude information. Utilize the MFD
for additional situational awareness.
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 were only receiving ADC 2 (or 1) information
when the other ADC failed. (This annunciation is still shown even though both ADCs
are failed.)
AHRS 1&2 TAS – AHRS 1 & 2 are not receiving airspeed information.
Figure 3A-4 – Dual ADC Failure (No. 1 PFD Shown)
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