EASA AD US-2019-01-06: Fuselage - Frame Web and Doubler - Inspection

What to do

Operators of affected Boeing 737 models must perform the required high frequency eddy current inspections within 120 days of March 19, 2019, for Group 1 airplanes, and at specified intervals for Groups 2 through 5 as detailed in Boeing Requirements Bulletin 737-53A1375 RB dated March 12, 2018. Any detected cracks must be repaired following approved procedures. Installation of STC ST01219SE does not require additional approval for compliance.

Summary

The Federal Aviation Administration's Airworthiness Directive 2019-01-06 addresses all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. This directive mandates repetitive surface high frequency eddy current inspections of the fuselage frame web and doubler at body station 303.9, specifically at the stop fitting at stringer 16 left, to detect cracks. The directive aims to ensure structural integrity and prevent potential rapid decompression.

What changed

This new airworthiness directive introduces mandatory repetitive inspections using high frequency eddy current techniques to detect cracks in the frame web and doubler at the specified fuselage location. It also requires applicable on-condition corrective actions if cracks are found. The directive clarifies that installation of Supplemental Type Certificate ST01219SE does not affect compliance requirements.

Why it matters

This directive is critical for aviation professionals as it addresses a structural safety concern that could compromise the airplane's ability to sustain limit loads, potentially leading to rapid decompression. Operators and maintenance organizations must incorporate these inspections into their maintenance programs to ensure continued airworthiness and regulatory compliance. Failure to comply could result in unsafe flight conditions and regulatory penalties.

What to do

Summary

What changed

Why it matters

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