Airworthiness directives › 2024-23-03
AD 2024-23-03 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-300, -400 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
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. The FAA is issuing this AD to address failure of the spoiler deflection to engage the MONFD. The unsafe condition, if not addressed, could lead to significant throttle split, leading to asymmetric thrust and the subsequent lack of autothrottle disengagement, which could result in an uncommanded roll and consequent loss of control of the airplane, and reduced ability of the flightcrew to maintain the safe flight and landing of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1