When can you file an airport as an alternate if there are at least two dedicated runways?

In the context of aviation regulations, particularly for flight planning under Part 135 operations, an airport can be filed as an alternate if there are two navigational sources available for an approach. This requirement is in place to ensure that pilots have adequate means to safely conduct an approach and landing in case of unexpected issues such as poor visibility or equipment failure.

Having at least two navigation sources increases redundancy and enhances safety, allowing pilots to utilize different systems for guidance when approaching the airport. This is particularly crucial in environments where one system may be compromised or inaccurate.

While the presence of two dedicated runways might offer more landing options, the decision to file an airport as an alternate heavily relies on the availability and reliability of navigation aids. Therefore, meeting the criteria of having at least two navigation sources is essential for safe alternate airport selection.