well, I am stabbing in the dark here, and still it is difficult to imagine these extreme attitudes continuing unchecked, but then so were the Kenyan/Flash accidents.
Rarely do we hear through official channels of incidents of this nature that are kept in-house. In other words close-calls but an accident avoided.
Difficult to imagine these extreme attitudes continuing unchecked?
I am not surprised. During a simulator session in the Boeing 737-200 where the captain and F/O were undergoing a type rating, the captain's ADI was "frozen" during a normal 25 degree angle of bank turn to the left. Initially, he was unaware of this as the comparitor light had not yet come on. The scene was a black night. The captain was then asked by "ATC" to stop the turn on a certain heading and as he started to roll out his ADI indicated the aircraft was still turning. The aim of the exercise was to demonstrate scan rate skill in that the captain should have immediately switched to the standby ADI to compare which of the three ADI's was most probably faulty.
Instead he continued to turn the control wheel in an attempt to level the aircraft not realising his ADI was actually frozen in a left turn. He kept pressure on the control wheel for several seconds causing the aircraft to roll beyond 90 degrees angle of bank to the right and the nose started to drop beyond 30 degrees below the horizon. The first officer meanwhile gazed seemingly stunned at his own display which correctly showed the true attitude. But he said nothing because he didn't know what to do or say. He had a total of 300 hours and this was his first jet aircraft.
The captain was by now thoroughly confused and looked at the standby ADI which was correctly indicating the aircraft rolling inverted. He then called out "Standby ADI failure" and immediately pulled the standby ADI caging button which did its job and levelled the ADI. All the while the first officer watched completely out of his depth. The result was now obvious so the instructor froze the simulator to discuss events.
The captain was highly experienced with over 10,000 hours on F28 and turbo-prop types.