13-2-5

Weather Deviation Tool

JO 7110.65BB, Change 3, effective July 9, 2026 · Official text on faa.gov

The weather deviation tool adds an additional converging, diverging, and intersecting (CDI) mileage buffer to the required separation calculated by ATOP when RNP distance‐based longitudinal separation is being applied.

Deviation monitor window pink advisories require further evaluation before approving a weather deviation clearance.
A pink advisory in the deviation monitor window with a zero or positive value in the +/- column indicates that the aircraft pair is either at or close to the required spacing.
Note
1. The CDI mileage buffer is enforced by ATOP conflict probe.
2. ATOP enforces an increased ADS-C reporting rate of 64 seconds.
Reference

FAA Order JO 7110.65, Para 8-7-3, Longitudinal Separation.
FAA Order JO 7110.65, Para 8-8-3, Longitudinal Separation.
FAA Order JO 7110.65, Para 8-9-3, Longitudinal Separation.
FAA Order JO 7110.65, Para 8-10-3, Longitudinal Separation.
FAA Order JO 7110.65, Para 13-2-2, Conflict Detection and Resolution.