Airworthiness Directive · Amendment 39-19850 · Fuselage
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-400 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This AD was prompted by a report of a certain modification that causes interference with inspections that are intended to detect fatigue cracks. This AD requires repetitive low frequency eddy current (LFEC) inspections of a certain fuselage upper skin lap splice for cracks, repetitive high frequency eddy current (HFEC) inspections of a certain fuselage upper skin lap splice for cracks, and applicable on-condition actions. 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 747-53A2901 RB, dated July 25, 2019, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 747-53A2901, dated July 25, 2019, which is referred to in Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019.
(1) For purposes of determining compliance with the requirements of this AD: Where Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019, uses the phrase “the original issue date of the Requirements Bulletin 747-53A2901 RB,” this AD requires using “the effective date of this AD,” except where Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019, uses the phrase “the original issue date of the Requirements Bulletin 747-53A2901 RB” in a note or flag note.
(2) Where Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019, specifies contacting Boeing for repair instructions: This AD requires doing the repair before further flight using a method approved in accordance with the procedures specified in paragraph (i) of this AD.
