AD FAA-2025-0924

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. This AD was prompted by a report of multiple instances of loss of transponder for airplanes entering airspace in the presence of continuous wave (CW) interference where the transponder did not meet the minimum operational performance standards (MOPS) requirement for transponder response. This AD requires replacing the left and right integrated surveillance system processor unit (ISSPU) hardware. The FAA is issuing this AD to address the unsafe condition on these products.