AD 2022-08-14 Prompted By Reports Of Fuselage Crown Stringer Cracking Between Station (STA) 740 and STA 1000, Stringer (S)-7 to S-12

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747-8F series airplanes.

This AD was prompted by reports of fuselage crown stringer cracking between station (STA) 740 and STA 1000, stringer (S)-7 to S-12. This AD requires repetitive detailed inspections for cracking of fuselage crown stringers and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective June 10, 2022.

Supplementary Information: The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all The Boeing Company Model 747-8F series airplanes. The NPRM published in the Federal Register on January 31, 2022 (87 FR 4826). The NPRM was prompted by reports of fuselage crown stringer cracking between STA 740 and STA 1000, S-7 to S-12. In the NPRM, the FAA proposed to require repetitive detailed inspections for cracking of fuselage crown stringers and applicable on-condition actions. The FAA is issuing this AD to address cracking in fuselage crown stringers. This 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.

FMI: www.regulations.gov