In mountainous terrain, when should you pull the MOR handle?

In mountainous terrain, the decision to pull the Minimum Operating Reference (MOR) handle is typically guided by the need to ensure safe altitude above the terrain. The correct choice of 8000 MSL (Mean Sea Level) reflects the altitude at which the aircraft would generally be above the highest obstacles or terrain features, providing a buffer to maintain safe flight and prevent terrain collisions.

At 8000 MSL, pilots are usually operating at a sufficient altitude to account for potential variations in terrain elevation, ensuring enough vertical separation. This altitude is often chosen because it allows for the safe operation of aircraft, considering factors like terrain sensitivity and the effects of wind or turbulence that can be prevalent in mountainous areas.

Operating below this altitude could place the aircraft in a risky position, especially as terrain features can vary significantly and unexpected weather conditions may arise. Therefore, pulling the MOR handle at this altitude is a precautionary measure that promotes safety when navigating through mountainous regions.