Yes, and his training would have alerted him to that, if it included this fact. If they didn’t tell him this in training, how is he supposed to know?
..... You got me there, but I can tell you this every plane made has a book on every thing possible to know about that plane. Also all emergency procedures are on laminated cards and are carried by both the pilot and the Guy In Back.
So when the probe failed the G.I.B. should have been going thru those procedures to verify what now works and what does not...[it is easy to second guess them, I do realize they were under extreme stress but you're right the training should have kicked in]