Can VNAV be used during a missed approach procedure?

VNAV, or Vertical Navigation, is designed to provide guidance along a predetermined vertical path. During a missed approach procedure, pilots must closely adhere to specific altitude and navigation requirements set forth in the procedure. This is critical for maintaining safe vertical separation from obstacles and ensuring a clear path amid potentially complex airspace constraints.

The prohibition on using VNAV during a missed approach is based on the fact that the missed approach requires precise maneuvering and adherence to published climb gradients, which might not be fully compatible with VNAV capabilities. The missed approach procedure often requires pilots to manually control the aircraft’s vertical flight path to ensure compliance with the necessary procedure, such as achieving a specific climb rate or altitude as outlined in the missed approach segment.

Therefore, using VNAV during a missed approach could lead to deviations from the required altitudes or procedures, jeopardizing safety. Consequently, it is essential for pilots to manage the aircraft’s ascent manually in such critical phases of flight to ensure adherence to regulatory requirements and safety standards.