Airworthiness Directive · Amendment 39-22882 · Flight controls
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 737-300 and -400 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 737-22A1399 RB, dated April 13, 2023.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-300 and -400 series airplanes. This AD was prompted by a report that flight control rigging tolerances could result in spoiler deflection not reaching the minimal level required to engage the cruise thrust split monitor (MONFD) used by the autothrottle (A/T) system. This AD requires changing certain wire bundles, installing a new housing assembly, removing the mechanical aileron force limiter (MAFL), doing an inspection or records check to determine if certain flight control computers (FCCs) are installed, and performing applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 737-22A1399 RB, dated April 13, 2023, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737-22A1399 RB, dated April 13, 2023.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 737-22A1399, dated April 13, 2023, which is referred to in Boeing Alert Requirements Bulletin 737-22A1399 RB, dated April 13, 2023.
Where the Compliance Time columns of the table in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 737-22A1399 RB, dated April 13, 2023, use the phrase “the original issue date of Requirements Bulletin 737-22A1399 RB,” this AD requires using the effective date of this AD.
