Brief Background of the Incident
Mayday Season 22 Features an Episode "Terror over Michigan" (Episode 6) based on the events of TWA Flight 841. The Episode revolves around a Boeing 727 cruising at 39000ft, Suddenly Loses 34000ft altitude in about a minute.
The episode depicts a shortcut (deviation from the SOPs) which involves pulling a circuit breaker leading to prevention of automatic extension of slats when the flaps are deployed (Flaps 9, I guess). The investigation talks about this procedure used sometimes to improve the performance of the aircraft while in cruise (which involves extension of flaps but NOT slats)
The episode takes a course where the circuit breaker pulled was accidentally pushed back again which caused the unintentional extension of the Slats. The aircraft starts rattling, on realizing the issue, the flap lever is pulled back to retract them but during retraction of both slats/flaps, Slat #7 remains extended in an unusual position leading to the uncontrollable descent (disruption of airflow over Slat #7). The documentary states at about 5000ft, the upset had caused the hanging Slat #7 to break off the aircraft, making it controllable again.
Does the sophistication built into present day airliners like the Boeing 737-800, A320neos, A350s, etc. have any protection feature to prevent Extending the Flaps but NOT SLATS during cruise? If they exist, Can they be overridden in the Flight Deck?