Under what condition is the use of VNAV during approaches permitted?

The use of VNAV (Vertical Navigation) during approaches is permitted when using LPV (Localizer Performance with Vertical Guidance) or LNAV/VNAV (Lateral Navigation/Vertical Navigation) minimums. This ensures that the aircraft can utilize vertical guidance provided by these approaches, which is critical for maintaining a safe and stable descent profile.

LPV and LNAV/VNAV approaches are designed with the capability of providing both lateral and vertical guidance, allowing for more precise navigation than traditional approaches. By adhering to the performance criteria associated with these minimums, pilots can be assured that they are complying with the required standards for safely executing an approach while utilizing VNAV functionalities, which are integral for maintaining proper altitude during the approach phase.

The other conditions listed either do not align with the allowances for VNAV usage or reflect situations where VNAV is not being appropriately leveraged for navigational aid.