The Captain's ADI on the L1011 has inputs from INS 1 and Vertical Gyro #3. The F/O's ADI has inputs from INS 2 and VG #3. The inputs are compared in the ADI instrument itself and outputs are then sent to the instrument comparator monitor which signals the appropriate attitude flag or the ATT 3 annunciator light on the center panel annunciator cluster.
Once a failure has been sensed, the remaining VG/INS's are monitored for validity only. Because there are only two remaining VG/INS's the comparator system can only warn of a difference between them. This is done by presenting an an attitude flag on both instrument comparators.
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