Very few EMERGENCIES require a
speed contest for execution of check-list.
Best example is engine fire during takeoff.
While burning, that engine will give you full thrust for the next minute.
Long enough to get you up to a safe altitude.
xxx
When training 747 pilots, I also trained 747 flight engineers.
I often said, IMMEDIATE ACTION starts by sitting on your hands 30 seconds.
The F/E better move his seat 2 feet back and look at the entire panel.
And up-front as well, such as engine instruments.
xxx
Accomplish (PNF or F/E) the IMMEDIATE ACTION as required.
Then go to the book. And proceed slowly with REFERENCE ACTIONS.
Understand the problem before moving any switches or handles.
Especially moving from one reference paragraph to another one.
Or going from one malfunction to another.
One check list followed by another might make problems WORSE.
xxx
In 747s, check-lists that include FLAPS and FLIGHT CONTROLS can be killers.
In memoriam of the EL AL Cargo crew in Amsterdam...
They lost engine nš 3 and 4, and then got LE/TE FLAPS on LH wing... only.
Yet they followed the check-lists to the letter. One check list, then another.
xxx
Happy contrails