What is the approach slope requirement for non-precision instrument runways?

The correct approach slope requirement for non-precision instrument runways is indeed identified as 34:1. This means that for every 34 horizontal units of distance from the threshold of the runway, the vertical elevation must not exceed 1 unit. This slope is designed to ensure that aircraft can safely approach and land on the runway under instrument flight rules, where visibility may be limited.

Maintaining this slope is crucial for air traffic safety as it provides adequate clearance from obstacles in the flight path, thus allowing pilots to have a safe margin during approach. Non-precision instrument runways, unlike precision instrument runways, do not utilize advanced ground-based navigation aids that would allow for steeper approach slopes; therefore, maintaining a 34:1 slope is an important standard in aviation safety regulations.