What type of approach procedure is necessary for a GPS-based alternate airport?

For a GPS-based alternate airport, it is crucial to understand the requirements for approach procedures. A non-GPS approach procedure is necessary as it ensures that there is a backup method to land at the alternate airport should the GPS system become inoperative or unreliable during flight. This is particularly important given the reliance on GPS technology which, while highly accurate, can be susceptible to signal degradation or interruptions.

Selecting a non-GPS approach such as an ILS (Instrument Landing System), VOR (VHF Omnidirectional Range), or NDB (Non-Directional Beacon) provides redundancy. This means that if the primary navigation method (GPS) fails, pilots have alternative means to navigate and execute a safe approach and landing, thereby increasing overall safety.

Other options do not meet the regulatory requirements effectively. While a standard approach procedure could be part of the choice, it does not specifically address the necessity of having a non-GPS method available. Additionally, visual approach procedures are not suitable as they require visual reference, which may not be available in all conditions. Choosing any type of approach procedure also lacks the necessary specificity and does not ensure that a reliable backup system is in place.