Why is the correct placement of approach lights critical?

The correct placement of approach lights is critical primarily to aid in aircraft navigation. Approach lights serve as an essential visual cue, guiding pilots as they prepare for landing by delineating the landing path and aligning them with the runway. This visual guidance is particularly crucial during low visibility conditions, such as fog or heavy rain, where visual references are limited. Properly positioned approach lights help in increasing safety by ensuring that pilots can correctly align their descent path and assess their height above the runway as they approach.

Improperly placed approach lights could lead to confusion or misalignment, increasing the risk of accidents during the critical phases of flight. These lights are designed to help pilots maintain awareness of their position relative to the runway, facilitating a smoother and safer landing process.