GPWS Mode 4 alerts are designed to warn pilots to protect against which hazard?

GPWS Mode 4 alerts are designed to warn pilots to protect against which hazard?

• A. To warn of wind shear
• B. To indicate stall
• C. To warn of turbulence
• D. To provide alert to protect against controlled flight into terrain

Answer: (D)

GPWS mode 4 is focused on preventing a dangerous situation where the aircraft could be flown into the terrain or obstacles while under control. This warning looks ahead along the flight path and compares the terrain elevations with the current altitude and trajectory so it can alert the crew in time to pull up and regain safe clearance. That CFIT (controlled flight into terrain) hazard is what this mode is designed to protect against. Other hazards like wind shear, stall, or turbulence are handled by different warnings or systems, but mode 4 specifically targets avoiding terrain collision.

GPWS mode 4 is focused on preventing a dangerous situation where the aircraft could be flown into the terrain or obstacles while under control. This warning looks ahead along the flight path and compares the terrain elevations with the current altitude and trajectory so it can alert the crew in time to pull up and regain safe clearance. That CFIT (controlled flight into terrain) hazard is what this mode is designed to protect against. Other hazards like wind shear, stall, or turbulence are handled by different warnings or systems, but mode 4 specifically targets avoiding terrain collision.