Airworthiness directives › 2018-09-08
AD 2018-09-08 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-200, -300, -400, -500 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
(1) This AD applies to The Boeing Company Model 737-200, -300, -400, and -500 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-53A1363, dated April 7, 2017. (2) Installation of Supplemental Type Certificate (STC) ST01219SE ( http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/EBD1CEC7B301293E86257CB30045557A?OpenDocument&Highlight=st01219se ) does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST01219SE is installed, a “change in product” alternative method of compliance (AMOC) approval request is not necessary to comply with the requirements of 14 CFR 39.17.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as required by paragraph (h) of this AD: At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 737-53A1363, dated April 7, 2017, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 737-53A1363, dated April 7, 2017.
Unsafe condition
This AD was prompted by reports of cracks in the frame web common to the stringer ties adjacent to the air-conditioning support brackets. We are issuing this AD to detect and correct cracks in the frame web common to the stringer ties adjacent to the air-conditioning support brackets, which could result in a severed frame, and, in combination with potential multiple site damage (MSD) at the stringer S-10 lap splice or chem-milled skin cracks, could result in possible rapid decompression and loss of structural integrity 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