If tab data is within 1000 feet of available runway, what should aircrews do?

When tab data is within 1000 feet of the available runway, aircrews should use the longer data between the tab and performance data. This approach ensures a greater safety margin by allowing for any unexpected variances that could affect the aircraft's performance during the takeoff or landing phases. By using the longer data, aircrews can accommodate potential changes in conditions such as weather, aircraft weight, or performance degradation, all of which can impact distance required for takeoff or landing.

This practice underscores a key principle in aviation safety: to always prioritize the safer option by accounting for uncertainties and ensuring that critical performance thresholds are met or exceeded. It helps to enhance operational safety by providing additional buffer which is particularly important in time-sensitive scenarios where runway length may be a critical factor.