EASA AD US-2018-12-05
Wings - Rear Spar Web and Lower Chord - Inspection
Summary
Airworthiness Directive 2018-12-05 is a final rule issued by the Federal Aviation Administration (FAA) addressing all Boeing 737-100, -200, -200C, -300, -400, and -500 series airplanes. It mandates repetitive detailed inspections of the rear spar web and lower chord on both left and right wings due to reported cracks. The directive aims to ensure structural integrity and flight safety by detecting and correcting these cracks.
What Changed
This new airworthiness directive introduces mandatory repetitive inspections for cracking in the rear spar web and lower chord of specified Boeing 737 models. It also requires applicable on-condition corrective actions if cracks are found. The directive clarifies that installation of Supplemental Type Certificate STC ST01219SE (winglets) 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 wing's ability to sustain flight loads. Operators and maintenance organizations must incorporate these inspections into their maintenance programs to prevent potential structural failures. Compliance ensures continued airworthiness and regulatory adherence, minimizing operational risks and potential grounding.
What To Do
Operators of affected Boeing 737 models must perform detailed or high frequency eddy current inspections of the rear spar web and lower chord within 120 days of the directive's effective date, July 13, 2018. Any detected cracks must be repaired following approved methods. Continued repetitive inspections are required as specified in Boeing Alert Requirements Bulletin 737-57A1337 RB dated September 14, 2017.
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