Airworthiness directives › 2023-01-13
AD 2023-01-13 Airworthiness Directives; The Boeing Company Airplanes
Models named: MD-88. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) airplanes; and Model MD-88 airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin MD80-57A246 RB, dated December 17, 2021.
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 MD80-57A246 RB, dated December 17, 2021, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin MD80-57A246 RB, dated December 17, 2021. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin MD80-57A246, dated December 17, 2021, which is referred to in Boeing Alert Requirements Bulletin MD80-57A246 RB, dated December 17, 2021.
Unsafe condition
This AD was prompted by an evaluation by the design approval holder (DAH) indicating that the center wing lower stringers S-11 through S-22 are subject to widespread fatigue damage (WFD). The FAA is issuing this AD to address potential fatigue cracking of the right and left side center wing lower stringers S-11 through S-22 between wing stations Xcw=13 and Xcw=15. If not addressed, undetected fatigue cracks could grow to a critical length after the structural modification point (SMP) at 81,740 total flight cycles. Any undetected cracks in three or more adjacent stringers in the right or left side center wing lower stringers S-11 through S-22 may result in a principal structural element's inability to sustain limit load, which could adversely affect the structural integrity of the airplane.
Affected ADs
This AD affects AD 2020-10-10, Amendment 39-19913 (85 FR 31046, May 22, 2020) (AD 2020-10-10).
Read the original on the Federal Register →
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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