Airworthiness directives › 2026-09-12
AD 2026-09-12 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-100, -200, -200C, -300, -400, -500 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-53A1409, Revision 1, dated October 27, 2023.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For airplanes identified as Group 1 in Boeing Alert Service Bulletin 737-53A1409, Revision 1, dated October 27, 2023: Within 120 days after the effective date of this AD, inspect the fuselage skin and structure common to the aft drain mast for any crack or corrosion and applicable on-condition actions, using a method approved in accordance with the procedures specified in paragraph (k) of this AD.
Unsafe condition
This AD was prompted by a report of cracks found in the fuselage skin underneath the aft drain mast. The FAA is issuing this AD to address cracking or corrosion in the fuselage skin and structure common to the aft drain mast. The unsafe condition, if not addressed, could result in the inability of the principal structural element (PSE) to sustain limit loads, which may result in rapid decompression of the fuselage and loss of structural integrity of the airplane.
Affected ADs
None.
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