Airworthiness Directives; The Boeing Company Airplanes

FAA / Federal Register · 2023-09430

The FAA proposes to supersede Airworthiness Directive (AD) 2022-06-16, which applies to all The Boeing Company Model 747-100, 747- 100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, and 747-400F series airplanes. AD 2022-06-16 requires revising the limitations and operating procedures sections of the existing airplane flight manual (AFM) to incorporate specific operating procedures for takeoff, instrument landing system (ILS) approaches, non-precision approaches, and go around and missed approaches, when in the presence of 5G C-Band interference as identified by Notices to Air Missions (NOTAMs). Since the FAA issued AD 2022-06-16, the FAA determined that additional limitations are needed due to the continued deployment of new 5G C-Band base stations whose signals are expected to cover most of the contiguous United States at transmission frequencies between 3.7-3.98 GHz. This proposed AD would require revising the limitations section of the existing AFM to incorporate limitations requiring specific operating procedures, and would retain the operating procedures for takeoff, ILS approaches, non-precision approaches, and go around and missed approaches from AD 2022-06-16, due to the presence of 5G C-Band interference. The FAA is proposing this AD to address the unsafe condition on these products.