For which emergency checklist located in the QRH would you refer to the SPE Tab?

The appropriate emergency checklist to refer to for the SPE (Speed Protection Element) Tab is associated with "Unreliable Airspeed." This checklist is designed specifically for situations where the indicated airspeed is not reliable, which could put the aircraft at risk of stalling or exceeding operating limits.

In such circumstances, the SPE functions as a critical guide, helping pilots to manage their speed safely by providing alternative airspeed references or methods to determine safe flying conditions under compromised airspeed indications. This is particularly vital during all phases of flight, especially takeoff, approach, and landing when airspeed control is crucial for safe operation.

The other options, while important in their contexts, do not specifically relate to the SPE Tab. For example, the "Weight on Wheels" checklist deals with landing gear and its indications, "Ditching" pertains to emergency landings on water, and "Forced Landing" focuses on emergency procedures for landing due to loss of power or other critical failures. Each has its own specific protocols and does not interface with the speed protection concepts that are highlighted under the Unreliable Airspeed checklist.