What primary information does the Alternate Engine Data Display (AEDD) provide?

The Alternate Engine Data Display (AEDD) is designed to provide critical engine performance information to pilots, especially during alternate engine operations. The primary data presented includes torque, N1, and cockpit pressure.

Torque is an essential measurement that allows pilots to understand the amount of rotational force being produced by the engine, which is crucial during various phases of flight and engine management. N1 refers to the speed of the first-stage rotor in a turbofan engine, providing insight into the engine's operation and performance status. Cockpit pressure helps pilots monitor the operational environment of the engine, ensuring safety and effective management during flight.

The other options do not represent the primary focus of the AEDD. For instance, while altitude and fuel flow are important parameters, they are typically displayed on different systems. Engine oil temperature and pressure are indeed critical for engine health but are not the main focus of the AEDD. Lastly, fuel efficiency ratings can be relevant, but this information is not provided by the AEDD. Thus, the presence of torque, N1, and cockpit pressure is what makes answer B the correct choice in terms of the primary information provided by the AEDD.