During qualification training, airline pilots learn to deal with depressurization, engine failure, and  emergency descent. It's a straight-forward process in training. Each of these are memory-response items that must be completed correctly. The training and checking for these emergency procedures evaluates each of these events separately. In fact, compound emergencies are not permitted to be evaluated.Unlike a "routine" decompression, an explosive decompression is a much more serious event. The time of useful consciousness (TUC) during an explosive decompression is roughly half the TUC of a slower decompression. While the TUC at 35,000 is 30-60 seconds, after an explosive decompression it will be 15-30 seconds.That is exactly what the pilots of Southwest Flight 1380 were faced with: Explosive Decompression, Engine Severe Damage, and Emergency Descent, and they performed magnificently.

Photo credit NTSB

(note missing fan blade at 7 O-clock position)

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