Airworthiness Directive · Amendment 39-22466 · Fuselage
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-8 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-8 series airplanes. This AD was prompted by a report of stress corrosion cracking in certain stringers and end stringer splice assemblies. This AD requires repetitive inspections of the stringers and end stringer splice assemblies for any crack, shim, or gap, 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 747-53A2909 RB, dated September 21, 2022, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022. For this AD, terminating action for certain end stringer springer splice assemblies are specified in paragraphs (g)(1) through (4) of this AD.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 747-53A2909, dated September 21, 2022, which is referred to in Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022.
(1) For any end stringer splice assembly on which no cracking is found after accomplishing CONDITION 3 (OPTION 2) (ACTION 1) and CONDITION 3 (OPTION 2) (ACTION 2) inspections specified in Table 1 of the Accomplishment Instruction of Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022, no further action is required by this AD for that end stringer splice assembly.
(2) For any end stringer splice assembly on which no cracking is found after accomplishing CONDITION 6 (OPTION 2) (ACTION 1) and CONDITION 6 (OPTION 2) (ACTION 2) inspections specified in Table 2 of the Accomplishment Instruction of Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022, no further action is required by this AD for that end stringer splice assembly.
(3) For any end stringer splice assembly on which no cracking is found after accomplishing CONDITION 8 (OPTION 2) (ACTION 1) and CONDITION 8 (OPTION 2) (ACTION 2) inspections specified in Table 3 of the Accomplishment Instruction of Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022, no further action is required by this AD for that end stringer splice assembly.
(4) For any end stringer splice assembly on which no cracking is found after accomplishing CONDITION 10 (OPTION 2) (ACTION 1) and CONDITION 10 (OPTION 2) (ACTION 2) inspections specified in Table 4 of the Accomplishment Instruction of Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022, no further action is required by this AD for that end stringer splice assembly.
(1) Where the Compliance Time column and certain notes of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022, use the phrase “the original issue date of Requirements Bulletin 747-53A2909 RB,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Alert Requirements Bulletin 747-53A2909 RB, dated September 21, 2022, 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.
