What is the minimum vertical visibility for a non-precision approach at an alternate airport?

For a non-precision approach at an alternate airport, the minimum vertical visibility requirement is indeed 800 feet. This standard is established to ensure that pilots have adequate visibility and separation from the ground while executing an approach.

In the context of non-precision approaches, which typically rely on lateral guidance rather than vertical guidance provided by an Instrument Landing System (ILS), the increased vertical visibility requirement is essential to enhance safety during approaches, especially when conditions are less than ideal.

Having at least 800 feet of vertical visibility allows pilots to discern their surroundings better as they approach the airport, positioning themselves safely for a landing. This visibility requirement has been standardized across various aviation regulations to mitigate the risk of accidents arising from poor visibility conditions.

Understanding these requirements is crucial for ensuring both compliance with regulations and the safety of flight operations in instrument meteorological conditions.