Airworthiness Directive · Amendment 39-21177 · Fuselage
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes, certificated in any category, as identified in Boeing Service Bulletin 747-53A2860, Revision 3, dated November 11, 2019.
The FAA is superseding Airworthiness Directive (AD) 2015-13- 06, which applied to certain The Boeing Company Model 747-400 and 747- 400F series airplanes. AD 2015-13-06 required repetitive inspections of the longeron extension fittings for cracking; repetitive high frequency eddy current (HFEC) inspections of any modified, repaired, or replaced longeron extension fitting for cracking; and applicable on-condition actions. This AD retains the requirements of AD 2015-13-06. This AD also requires, for certain additional airplanes, repetitive inspections of the longeron extension fittings for cracking and repair if necessary. This AD was prompted by the FAA's determination that additional airplanes are affected by the identified unsafe condition. 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 paragraph 1.E., “Compliance,” of Boeing Service Bulletin 747-53A2860, Revision 3, dated November 11, 2019, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Service Bulletin 747-53A2860, Revision 3, dated November 11, 2019.
(1) Where Boeing Service Bulletin 747-53A2860, Revision 3, dated November 11, 2019, uses the phrase “the Revision 3 date of this service bulletin,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Service Bulletin 747-53A2860, Revision 3, dated November 11, 2019, specifies contacting Boeing for repair instructions: This AD requires doing the repair using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
