What two parameters are measured using the altitude method in the ELP?

The two parameters that are measured using the altitude method in the Emergency Landing Patterns (ELP) are the current Mean Sea Level (MSL) altitude and the desired key altitude. The key altitude is crucial as it represents the point at which the aircraft should be at a certain altitude to ensure a safe and effective descent for landing in an emergency situation.

By comparing the current MSL altitude to the desired key altitude, pilots can make informed decisions about the necessary adjustments in their descent profile. This method helps ensure that they are on track to reach the intended landing surface safely and effectively during an emergency.