Originally Posted by Lonewolf _50
... what did he(PF) see? Though the betting money is on all of the AH's working, the PNF did switch sources to a different inertial gyro for one reason or another.
The PNF was apparently looking at all three displays between 02:10:25 and 02:10:36:
Reading the three instruments (the two PFD’s and the ISIS), the PNF noticed that the
airplane was climbing and asked the PF several times to descend.
Subsequently he made following selections:
02:10:40 F/O on ADR3
02:10:44 F/O on IR3
02:12:15 CAPT on ADR3
02:12:19 CAPT on IR3
02:13:25 CAPT on ADR1