What are the altitudes for emergency use only on an approach procedure called?

The term for altitudes designated for emergency use only during an approach procedure is referred to as MSA, which stands for Minimum Safe Altitude. MSAs provide a safe altitude that ensures obstacle clearance in the surrounding area, primarily used for emergency situations like missed approaches or diversions.

By adhering to the MSA on approach, pilots are assured of clearance above obstacles, even if they do not have visual references. These altitudes are important safety measures in ensuring that aircraft remain clear of terrain or other hazards during unexpected circumstances. MSAs can be depicted on approach charts and are crucial for the safety and planning of flight operations in the vicinity of airports.