Airworthiness directives › 2023-12-08
AD 2023-12-08 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-8 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD was prompted by a report of stress corrosion cracking in the stringers and end stringer splice assemblies located between station (STA) 2285 and STA 2300 from stringers S-17 to S-25 on the left and right sides of the airplane caused by excessive and sustained internal tensile stresses that were due to no shim being installed or shimmed gaps exceeding engineering limits at production. A crack in a stringer or end stringer splice assembly could grow in length and go undetected. The unsafe condition, if not addressed, could result in the inability of a structural element to sustain limit load and could adversely affect the structural integrity of the airplane.
Affected ADs
None.
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