Which action has the lower maximum airspeed: extending Landing Light or extending Search Light?

Which action has the lower maximum airspeed: extending Landing Light or extending Search Light?

• A. Landing Light extension 130 knots
• B. Open Gunner's Window 170 knots
• C. Landing Light extended 180 knots
• D. Search Light extension 100 knots

Answer: (D)

External equipment on the UH-60 has published maximum airspeeds for extension to protect structural integrity and flight safety. The search light, when extended, is the most exposed to wind loads and vibration, and its mechanism and wiring are more susceptible to damage at higher airspeeds, so it’s limited to a lower speed—100 knots. Landing lights are designed to withstand greater airflow when extended, which is why their listed limits (130 or 180 knots in the options) are higher. The action with the lowest maximum airspeed among the options is extending the search light, making it the correct choice.

External equipment on the UH-60 has published maximum airspeeds for extension to protect structural integrity and flight safety. The search light, when extended, is the most exposed to wind loads and vibration, and its mechanism and wiring are more susceptible to damage at higher airspeeds, so it’s limited to a lower speed—100 knots. Landing lights are designed to withstand greater airflow when extended, which is why their listed limits (130 or 180 knots in the options) are higher. The action with the lowest maximum airspeed among the options is extending the search light, making it the correct choice.