What is the appropriate action if RVR is notamed OUT OF SERVICE before takeoff?

The correct action when RVR (Runway Visual Range) is notamed OUT OF SERVICE before takeoff is to use the alternate visibility for takeoff. This means that if the RVR readings are not available, the flight crew can rely on alternate visibility criteria that may allow for takeoff under specific conditions as outlined in their operating procedures or regulations.

In aviation, alternate visibility can refer to the minimums established by authorities for different types of operations or aircraft. By using these criteria, the crew can assess whether it is safe to proceed with takeoff, assuming all other operational aspects are within limits. This ensures that safety is maintained even without the standard RVR data.

The other responses do not align with safety protocols and regulatory requirements. Continuing takeoff with only the minimum required visibility without reliable RVR readings could compromise safety. Delaying takeoff until the RVR service is restored could lead to unnecessary holds and increased operational costs but may not be required depending on the alternate visibility standards in place. Filing a new flight plan would not address the current situation concerning visibility as it relates specifically to the aircraft's ability to take off safely.