Under which conditions will the gear warning horn sound?

Under which conditions will the gear warning horn sound?

• A. Flaps beyond 2 and gear not down
• B. Gear not down and aircraft below 500 feet AGL RA
• C. Gear not down and RA is operative and AOA less than 0.4 and thrust lever angle back to 8.7 degrees (or less than approach power)
• D. All of the above

Answer: (D)

The gear warning horn is designed to alert you when you’re in a landing configuration but the landing gear isn’t down and locked. It uses several indicators to decide when you’re in a critical moment near landing, such as flap position, radar altitude, angle of attack, and thrust setting. If flaps are extended beyond a certain point (beyond 2) and the gear is not down, you’re in a landing configuration and the horn will sound to prompt lowering the gear. If the gear remains up while the aircraft is below 500 feet AGL, you’re in the final approach phase with insufficient gear deployment, so the horn fires as a warning. If the gear is not down and radar altitude is operative, plus the angle of attack is low (less than 0.4) and thrust lever angle is back to a reduced approach power (around 8.7 degrees or less), that combination indicates a low-energy approach where the gear should be down, so the horn will sound. Because each of these conditions can independently indicate a dangerous gear-up scenario during approach and landing, all of the above are valid triggers for the gear warning horn.

The gear warning horn is designed to alert you when you’re in a landing configuration but the landing gear isn’t down and locked. It uses several indicators to decide when you’re in a critical moment near landing, such as flap position, radar altitude, angle of attack, and thrust setting.

If flaps are extended beyond a certain point (beyond 2) and the gear is not down, you’re in a landing configuration and the horn will sound to prompt lowering the gear. If the gear remains up while the aircraft is below 500 feet AGL, you’re in the final approach phase with insufficient gear deployment, so the horn fires as a warning. If the gear is not down and radar altitude is operative, plus the angle of attack is low (less than 0.4) and thrust lever angle is back to a reduced approach power (around 8.7 degrees or less), that combination indicates a low-energy approach where the gear should be down, so the horn will sound.

Because each of these conditions can independently indicate a dangerous gear-up scenario during approach and landing, all of the above are valid triggers for the gear warning horn.