When is a Pilot Report (PIREP) required?

A Pilot Report, often referred to as a PIREP, is a critical form of real-time weather reporting from pilots that provides valuable information about atmospheric conditions experienced during flight. The requirement for a PIREP arises particularly when there is an unusual occurrence, which encompasses a range of significant weather phenomena, such as severe turbulence, icing, or other unexpected conditions that could impact flight safety.

The importance of reporting unusual occurrences is rooted in the fact that real-time data from pilots in-flight can greatly enhance situational awareness for other pilots and air traffic controllers, allowing for informed decision-making and potentially avoiding hazardous situations. This information is crucial for maintaining safety and is often utilized in updating forecasts and advisories during flights.

While reporting anticipated turbulence or better-than-forecasted conditions can also be beneficial, it is not mandated in the same way as reporting unusual or dangerous conditions. Similarly, filing a flight plan does not inherently trigger a requirement to provide a PIREP. The emphasis on unusual occurrences highlights the proactive role pilots play in contributing to overall flight safety through real-time reporting.