Airworthiness Directive · Amendment 39-19382 · Doors
the Boeing Company Airplanes
(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.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This AD was prompted by several reports of cracks in a certain floor beam lower chord at door stop fitting No. 1 of the forward airstair door cutout. This AD requires repetitive inspections for any cracks and applicable on-condition actions. We are issuing this AD to address the unsafe condition on these products.
(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.
(1) For purposes of determining compliance with the requirements of this AD: Where Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017, uses the phrase “the original issue date of Requirements Bulletin 737-53A1370 RB,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017, specifies contacting Boeing, this AD requires repair using a method approved in accordance with the procedures specified in paragraph (i) of this AD.
(3) Where Step 2. of Appendix A of Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017, specifies “Electrically close the door,” this AD allows closing the door electrically or manually.
(4) Where Step 6. of Appendix A of Boeing Alert Requirements Bulletin 737-53A1370 RB, dated December 13, 2017, specifies to “Cycle the door electrically and make sure it operates smoothly,” this AD allows cycling the door electrically or manually and making sure it operates smoothly.
