Is VNAV guidance for a V-MDA approach that includes a step-down fix allowed?

In the context of VNAV guidance for an approach that includes a V-MDA with a step-down fix, it's important to recognize that this type of approach does not allow for VNAV guidance. The reason for this is rooted in approach design principles and safety considerations. A V-MDA (Visual Minimum Descent Altitude) approach requires pilots to be particularly vigilant about their altitude as they navigate through potentially challenging terrain, especially when a step-down fix is involved, which necessitates a decision to be made at specific points along the route.

Allowing VNAV guidance in these scenarios could lead to a conflict between automated descent profiles and the required pilot decision-making processes. Pilots might rely too heavily on the automation instead of adhering to the specific altitude restrictions tied to the step-down fix. This could compromise safety, leading to the prohibition against VNAV guidance being utilized for V-MDA approaches with step-down fixes. Thus, the prohibition is firmly enforced to ensure adherence to the altitude constraints at each segment of the approach, which are vital for maintaining safe vertical navigation.

In summary, the answer indicates that VNAV guidance for a V-MDA approach that includes a step-down fix is not permitted, ensuring that pilots maintain the necessary altitude awareness and decision-making required for