Private Pilot Private Exam

A below glide slope indication from a pulsating approach slope indicator exhibits which light signal?

1. Steady white light

2. Pulsating red light

3. Amber light signal

4. Steady green light

The correct answer is: Pulsating red light

The light signal corresponding to a below glide slope indication from a pulsating approach slope indicator is a pulsating red light. This signal is essential for pilots during instrument approaches, signaling that the aircraft is below the optimal glide path for landing. In an Instrument Landing System (ILS) or Precision Approach Procedure, the approach slope indicator provides guidance to ensure that the aircraft is on the correct glide slope. When the indicator shows a pulsating red light, it warns the pilot that they need to climb in order to intercept the glide slope. This visual cue is designed to draw attention to the situation, emphasizing the importance of correcting altitude to safely approach the runway. In contrast, other light signals such as steady white lights indicate that the aircraft is above the glide slope, while amber lights—which typically indicate caution—are not used in this specific approach context. Steady green lights normally indicate that the aircraft is on the glide slope or clear for landing, thus not applicable in this scenario either. Understanding these signals is crucial for maintaining safe flying practices during approach and landing.