Airworthiness Directive · Amendment 39-23004 · Fuselage
The Boeing Company Airplanes
(1) This AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category.
(2) Installation of Supplemental Type Certificate (STC) ST00830SE does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST00830SE 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.
The FAA is superseding Airworthiness Directive (AD) 2021-09- 06, which applied to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. AD 2021-09-06 required repetitive inspections for cracking of the left- and right-hand outboard chords of certain frame fittings and failsafe straps at a certain station around eight fasteners, and repair if any cracking is found. This AD was prompted by additional reports of cracking in the area and a subsequent determination that additional inspections are needed to address the unsafe condition. This AD requires repetitive detailed and ultrasonic inspections for cracking of the left- and right-hand sides of certain frame fittings and failsafe straps, and repair if any cracking is found. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 737-53A1414 RB, Revision 1, dated November 20, 2023, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737-53A1414 RB, Revision 1, dated November 20, 2023.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 737-53A1414, Revision 1, dated November 20, 2023, which is referred to in Boeing Alert Requirements Bulletin 737-53A1414 RB, Revision 1, dated November 20, 2023.
(1) Where the Condition and Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 737-53A1414 RB, Revision 1, dated November 20, 2023, use the phrase “the original issue date of Requirements Bulletin 737-53A1414 RB,” or “the Revision 1 date of Requirements Bulletin 737-53A1414 RB,” this AD requires using the effective date of this AD.
(2) Where Boeing Alert Requirements Bulletin 737-53A1414 RB, Revision 1, dated November 20, 2023, specifies contacting Boeing for repair instructions: This AD requires doing the repair using a method approved in accordance with the procedures specified in paragraph (i) of this AD.
(3) For airplanes on which the left- and right-side STA 663.75 frame fitting assembly was replaced using instructions approved via FAA Form 8100-9, the airplane is to be considered Configuration 2 of the applicable group as identified in Boeing Alert Requirements Bulletin 737-53A1414 RB, Revision 1, dated November 20, 2023.
