EASA AD US-2025-07-03
Fuselage - Frame Fittings and Failsafe Strap Outboard Chords - Repetitive Inspections
Summary
Fuselage - Frame Fittings and Failsafe Strap Outboard Chords - Repetitive Inspections is a Federal Aviation Administration (FAA) Airworthiness Directive (AD 2025-07-03) that applies to all Boeing 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD mandates repetitive detailed and ultrasonic inspections for cracking on the left- and right-hand sides of certain frame fittings and failsafe straps at station 663.75, with required repairs if cracking is found. The directive aims to maintain the structural integrity of these Boeing 737 models by addressing potential failures in principal structural elements.
What Changed
This AD supersedes AD 2021-09-06 and introduces additional repetitive inspections using both detailed and ultrasonic methods to detect cracking in the frame fittings and failsafe straps. It clarifies the acceptance of previously approved alternative methods of compliance (AMOCs) and confirms that installation of certain winglet Supplemental Type Certificates (STCs) does not affect compliance. The AD also adds provisions for crediting prior repairs and inspections performed under earlier AMOCs.
Why It Matters
This AD is critical for aviation professionals because it addresses an unsafe condition that could compromise the structural integrity of Boeing 737 airplanes, potentially leading to loss of control. Operators, maintenance, and repair organizations must ensure compliance with the enhanced inspection requirements to prevent structural failures. The directive also provides clarity on compliance for aircraft with winglet modifications and previously approved repairs, aiding in regulatory adherence and operational safety.
What To Do
Affected operators must perform repetitive detailed and ultrasonic inspections of the specified frame fittings and failsafe straps starting by May 13, 2025, and repair any detected cracking before further flight. They should review Boeing Alert Requirements Bulletin 737-53A1414 RB, Revision 1, dated November 20, 2023, for inspection and repair procedures. Additionally, operators with prior approved repairs should verify their configuration status and may request acceptance of previously approved AMOCs as outlined in the AD.