Which GPWS mode is associated with Excessive terrain closure rate?

Which GPWS mode is associated with Excessive terrain closure rate?

• A. Mode 2
• B. Mode 5
• C. Mode 1
• D. Mode 3

Answer: (A)

GPWS uses separate warnings for different dangerous situations, each tied to a specific parameter being monitored. When the aircraft is closing on terrain too quickly, the system looks at how fast the distance to the terrain is decreasing and issues a warning once that rate exceeds a safe threshold. That particular condition is associated with the second mode. The other modes alert on different scenarios—such as an excessive descent rate or an altitude loss after takeoff—so they don’t apply to excessive terrain closure rate.

GPWS uses separate warnings for different dangerous situations, each tied to a specific parameter being monitored. When the aircraft is closing on terrain too quickly, the system looks at how fast the distance to the terrain is decreasing and issues a warning once that rate exceeds a safe threshold. That particular condition is associated with the second mode. The other modes alert on different scenarios—such as an excessive descent rate or an altitude loss after takeoff—so they don’t apply to excessive terrain closure rate.