What does it imply when VGSI and ILS glidepath are not coincident?

• A. The Papi/Vasi lights have an angle that is different than the glideslope angle
• B. The landing gear is retracted
• C. The autopilot engages automatically
• D. The runway lighting must be adjusted

Answer: (B)

On an approach, the visual glidepath cues (PAPI/VASI) are meant to match the instrument glidepath from the ILS. If they’re not coincident, it means the visual indicator shows a different descent angle than the ILS glideslope. The most direct way to describe that situation is that the PAPI/VASI lights are at a different angle than the glideslope angle. This mismatch can mislead you if you rely on the visual cue alone, so you should cross-check with the aircraft’s instruments and consider possible calibration or maintenance issues with the visual system. The other options don’t address the relationship between the visual and instrument glidepaths: gear configuration, autopilot behavior, or runway lighting adjustments are not explanations for VGSI and ILS glidepath misalignment.