Airworthiness Directive · Amendment 39-21922 · Navigation
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2023-12-05. Comply with the one in force.
This AD applies to The Boeing Company airplanes identified in paragraphs (c)(1) and (2) of this AD, certificated in any category.
(1) Model 747-8F and 747-8 series airplanes.
(2) Model 777-200, -200LR, -300, -300ER, and 777F series airplanes.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747-8F and 747-8 series airplanes and Model 777 airplanes. This AD was prompted by a determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.7-3.98 GHz frequency band (5G C-Band), and a recent determination that this interference may affect multiple airplane systems using radio altimeter data, including the pitch control laws, including those that provide tail strike protection, regardless of the approach type or weather. This AD requires revising the limitations section of the existing airplane flight manual (AFM) to incorporate limitations prohibiting dispatching or releasing to airports, and approaches or landings on runways, when in the presence of 5G C-Band interference as identified by Notices to Air Missions (NOTAMs). The FAA is issuing this AD to address the unsafe condition on these products.
Within 2 days after the effective date of this AD: Revise the Limitations Section of the existing AFM to include the information specified in figure 1 to paragraph (g) of this AD. This may be done by inserting a copy of figure 1 to paragraph (g) of this AD into the existing AFM.
Note 1 to paragraph (g): Additional information about the unsafe condition identified in this AD can be found in Boeing Multi Operator Messages MOM-MOM-22-0024-01B(R2), dated January 18, 2022, and MOM-MOM-22-0039-01B(R1), dated January 18, 2022, for Boeing Model 777 airplanes and Model 747-8F and 747-8 series airplanes, respectively.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
