Airworthiness directives › 2019-08-02
AD 2019-08-02 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
(1) 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 737-53A1360, dated June 21, 2018. (2) Installation of Supplemental Type Certificate (STC) 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
For airplanes identified as Group 1 in Boeing Alert Service Bulletin 737-53A1360, dated June 21, 2018: Within 120 days after the effective date of this AD, inspect the airplane and do all 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 reports of cracking in the frame web, frame integral inboard chord, and fail-safe chord on multiple airplanes in multiple locations between stringers S-10 and S-17 above the passenger floor, in addition to an evaluation by the design approval holder (DAH) indicating that the fuselage frame splices from station (STA) 380 to STA 520 and STA 727A to STA 907 between stringers S-13 and S-14 are subject to widespread fatigue damage (WFD). We are issuing this AD to address cracks in these locations, which could grow large enough to sever frames. Continued operation with multiple adjacent severed frames or a combination of a severed frame adjacent to fuselage skin cracks in chem-milled pockets could result in a loss of structural integrity or uncontrolled decompression.
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