Some checklists include memory items - things that ought to be done immediately, without delay caused by looking up a checklist. An engine failure scenario is o

Some checklists include memory items - things that ought to be done immediately, without delay caused by looking up a checklist. An engine failure scenario is one where you don't want to spend time getting out the checklist. For the engine checks, you develop a flow from one area of the cockpit to the other, basically touching everything related to the engine. For a Cessna 172 you'd check fuel selector valve, alternate air intake, fuel shutoff valve, throttle, mixture, carb heat (if equipped), engine instruments, ignition switch, magnetos, fuel pump (if equipped).