EASA AD US-2022-08-14: Fuselage - Crown Stringers - Inspection

What to do

Operators of Boeing 747-8F airplanes must perform repetitive detailed inspections of the fuselage crown stringers as specified in Boeing Alert Requirements Bulletin 747-53A2906 RB starting from the effective date of June 10, 2022. Any cracks found must be repaired following the approved procedures, including HFEC inspections of repaired areas. Requests for alternative methods of compliance can be submitted to the FAA Seattle ACO Branch as outlined in the directive.

Summary

Federal Register Volume 87, Number 88 (May 6, 2022) Final Rule titled 'Fuselage - Crown Stringers - Inspection' is a new airworthiness directive issued by the FAA for all Boeing 747-8F series airplanes. It addresses reports of cracking in the fuselage crown stringers between station 740 and 1000, specifically stringers S-7 to S-12. The directive mandates repetitive detailed inspections and applicable on-condition repairs to maintain structural integrity.

What changed

This new airworthiness directive introduces mandatory repetitive detailed inspections for cracking in the fuselage crown stringers of Boeing 747-8F airplanes. It also requires high frequency eddy current inspections for repaired areas and specifies repair procedures if cracks are found. The directive replaces no previous ADs and is based on Boeing Alert Requirements Bulletin 747-53A2906 RB dated July 16, 2021.

Why it matters

This directive is critical for aviation professionals as it ensures the early detection and repair of structural cracks that could compromise the airplane's ability to sustain limit loads. Operators and maintenance teams must comply to prevent potential structural failures, thereby safeguarding flight safety and avoiding costly unplanned repairs or grounding. Compliance also ensures adherence to FAA safety regulations and avoids regulatory penalties.

What to do

Summary

What changed

Why it matters

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