Wings - Center Tank Upper Skin Panels - Inspection
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Boeing 747 models must perform the low frequency eddy current inspection of the center tank upper skin panels as specified in Boeing Alert Requirements Bulletin 747-57A2370 RB by the effective date. Any structural damage found must be repaired before further flight using FAA-approved methods. Compliance with this directive is mandatory by January 4, 2023.
Summary
The Federal Aviation Administration Airworthiness Directive 2022-23-12 is a final rule addressing all Boeing 747 series airplanes including models 747-100 through 747SP. It mandates a one-time low frequency eddy current inspection of specific center tank upper skin panels for structural damage caused by heat exposure from composite trim air diffuser ducts. This directive aims to prevent potential heat damage that could compromise the wing center section and adjacent structures.
What changed
This new airworthiness directive introduces a mandatory inspection requirement for Boeing 747 series airplanes due to reports of composite degradation and hot air leakage in trim air diffuser ducts. It requires operators to perform a one-time inspection and repair any damage found to ensure structural integrity. The directive also provides specific compliance instructions and allows for alternative methods of compliance with FAA approval.
Why it matters
This directive is critical for aviation professionals because it addresses a latent safety risk that could lead to structural failure if undetected heat damage persists. Operators and maintenance organizations must ensure compliance to maintain airworthiness and prevent potential loss of safe flight and landing capability. The inspection and repair requirements help safeguard the structural integrity of the wing center section, directly impacting aircraft safety and operational reliability.
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