Airworthiness directives › 2018-18-03
AD 2018-18-03 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 Requirements Bulletin 737-53A1370 RB, dated December 13, 2017. (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
(1) For airplanes identified as Group 1 in Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017: Within 120 days after the effective date of this AD, inspect the STA 312 floor beam lower chord and door stop fittings No. 2, No. 5 and No. 8 for any cracks and do applicable on-condition actions, using a method approved in accordance with the procedures specified in paragraph (i) of this AD. (2) Except as required by paragraph (h) of this AD: For airplanes identified as Group 2 in Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017, at the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017. Note 1 to paragraph (g)(2) of this AD: Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 737-53A1370, dated December 13, 2017, which is referred to in Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017.
Unsafe condition
This AD was prompted by several reports of cracks in the station (STA) 312 floor beam lower chord at door stop fitting No. 1 of the forward airstair door cutout. We are issuing this AD to address such cracking, which could result in the inability of a principal structural element to sustain limit loads and possible rapid 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