For CH-53 with RB 100 ft, what are the day and night HLZ values?

For CH-53 with RB 100 ft, what are the day and night HLZ values?

• A. 150/200
• B. 185/235
• C. 150/150
• D. 200/250

Answer: (D)

HLZ sizing for a CH-53 uses the rotor diameter as the deciding factor for how much space is needed. With a rotor diameter around 100 feet, the landing zone must be large enough to keep the rotor arc, rotor wash, and potential turbulence within clear margins during the landing and touchdown. In daylight, pilots can gauge distances visually, so a 200-foot HLZ provides the necessary clearance. At night, visibility is reduced, so an additional margin is added, bringing the HLZ requirement to 250 feet. That combination—200 feet in day conditions and 250 feet at night—matches the standard table for a CH-53 with RB about 100 feet, which is why 200/250 is the correct pairing.

HLZ sizing for a CH-53 uses the rotor diameter as the deciding factor for how much space is needed. With a rotor diameter around 100 feet, the landing zone must be large enough to keep the rotor arc, rotor wash, and potential turbulence within clear margins during the landing and touchdown. In daylight, pilots can gauge distances visually, so a 200-foot HLZ provides the necessary clearance. At night, visibility is reduced, so an additional margin is added, bringing the HLZ requirement to 250 feet. That combination—200 feet in day conditions and 250 feet at night—matches the standard table for a CH-53 with RB about 100 feet, which is why 200/250 is the correct pairing.