Airworthiness Directive · Amendment 39-19173 · Fuselage
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 777-53A0083, dated April 20, 2017.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes. This AD was prompted by reports of corrosion in the aft fuselage. This AD requires a one-time review of the operator's maintenance procedures, repetitive detailed internal and external inspections for corrosion or cracking, and applicable on-condition actions. This AD also includes an optional terminating action for the inspections. We are issuing this AD to address the unsafe condition on these products.
Except as required by paragraphs (h)(1) through (h)(3) of this AD: At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 777-53A0083, dated April 20, 2017, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 777-53A0083, dated April 20, 2017.
(1) Where Boeing Alert Service Bulletin 777-53A0083, dated April 20, 2017, uses the phrase “after the original issue date of this service bulletin,” for purposes of determining compliance with the requirements of this AD, the phrase “after the effective date of this AD” must be used.
(2) Where Boeing Alert Service Bulletin 777-53A0083, dated April 20, 2017, specifies contacting Boeing, and specifies that action as RC: This AD requires using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
(3) Where Boeing Alert Service Bulletin 777-53A0083, dated April 20, 2017, specifies to apply corrosion inhibiting compound BMS3-29 to the cleaned and neutralized area, and specifies that action as RC: This AD allows operators to apply BMS3-29, BMS3-35, or a base coat of BMS3-29 or BMS3-35 with a top coat of BMS3-26.
Accomplishment of “PART 5: CLEANING AND NEUTRALIZATION,” as specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 777-53A0083, dated April 20, 2017, terminates the repetitive inspections required by paragraph (g) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
