What is the maximum ground slope allowed to land a size 1 helicopter during the day without issuing an advisory?

• A. 9 degrees
• B. 5 degrees
• C. 3 degrees
• D. 7 degrees

Answer: (D)

Ground slope is how much the landing area tilts away from level. For a size 1 helicopter landing in daylight without an advisory, the maximum allowed slope is seven degrees. This limit reflects the balance between the helicopter’s stability on uneven ground, the risk of rollover during touchdown, and the pilot’s ability to safely control the rotor wash and fuselage attitude. If the slope is seven degrees or less, no advisory is needed and a normal landing can proceed. If the slope exceeds seven degrees, an advisory would be issued to alert the crew to the hazard and to consider alternate landing options. Smaller limits (like three or five degrees) are more conservative than necessary for this scenario, and nine degrees would go beyond the safe daytime threshold without advisory.