A steep approach for a helicopter involves setting up a steep angle of descent, which is often used in situations where there is a need to land in a confined area or when obstacles are present. It is important to manage the power settings carefully during a steep approach to maintain control and ensure a safe landing.

When making a steep approach into a forested area, the Pilot should be aware of the following:

“Recirculating air from rotor downwash, which increases descent rate and makes hovering difficult” → CORRECT. This can increase the descent rate and make hovering difficult, especially in confined spaces between tall trees.

“Being outside the Height-Velocity (HV) diagram, so that in case of an engine failure, a safe forced landing may be possible” → CORRECT. The H/V diagram (dead man's curve) illustrates the combinations of height and airspeed that should be avoided because they may not allow sufficient time or altitude to enter a stabilised autorotation in the event of a power or gearbox failure. Operating within the unsafe area of the chart can be fatal, as in case of an engine failure it may not be possible to make a safe landing.

“The risk of tail rotor vortex interference due to turbulence from uneven terrain” → CORRECT. Turbulence from uneven terrain can interfere with the tail rotor. This can disturb the airflow through the rotor, requiring more power and potentially leading to a vortex ring state on the tail rotor. The disturbed airflow can cause the tail rotor to become less effective, leading to control difficulties and increased risk of yaw instability.

“The risk of settling with power, leading to a rapid loss of lift” → CORRECT. When performing a steep approach, especially in a confined or forested area, the helicopter may encounter a vortex ring state if the descent rate is too high and the forward airspeed is too low. This condition can lead to a rapid loss of lift and control, making it difficult to arrest the descent, especially if the helicopter descends into its own turbulent wake.