Superseded by FAA AD 2019-14-15

Published: Jan 19, 2018
Effective: Jan 22, 2018
Deadline: Jan 22, 2018

Boeing 737

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of affected Boeing 737 models must perform the required inspections within 120 days of the directive's effective date, January 22, 2018. They must also carry out any necessary on-condition repairs if cracks are detected. Compliance with the directive ensures continued safe operation and adherence to FAA regulations.

Summary

FAA Airworthiness Directive 2017-25-12 is a final rule affecting all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It addresses fatigue cracking in the webs of the stub beams at certain fuselage stations caused by cyclical loading from pressurization, wing loads, and landing loads. The directive mandates repetitive inspections and applicable corrective actions to ensure continued airworthiness.

What changed

This new airworthiness directive introduces mandatory repetitive inspections for cracking in the stub beam webs at specified fuselage stations on affected Boeing 737 models. It also includes on-condition repair actions if cracking is found. Additionally, it clarifies that installation of Supplemental Type Certificate STC ST01219SE does not affect compliance requirements.

Why it matters

This directive is critical for aviation professionals as it addresses a structural fatigue issue that could compromise the airframe's integrity, potentially leading to landing gear collapse or pressure deck failure. Operators and maintenance teams must monitor and repair cracking to maintain safety and regulatory compliance, preventing costly incidents or grounding of aircraft.

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