What is a "displaced threshold" on a runway?

A displaced threshold on a runway is indeed the point where landing is restricted due to obstacles that are either on the runway itself or in the approach path to the runway. It indicates a segment of the runway that is not available for landing purposes but is still usable for takeoffs.

This situation often arises when there are physical obstructions that could pose a risk to aircraft during the landing phase, such as trees, buildings, or other obstacles that prevent an aircraft from landing safely at the beginning of the runway. The displaced threshold effectively moves the landing area further down the runway, ensuring that aircraft can approach and land safely while maintaining clearance from any hazards.

The concept of a displaced threshold plays a crucial role in maintaining safety standards at airports and ensures compliance with regulatory guidelines regarding runway operations. Understanding its implications can greatly affect operational decisions for pilots, particularly in terms of calculating landing distances and approach paths.