EASA AD US-2025-24-02: Landing Gear - Main Landing Gear Brake Hydraulic Hoses - Inspection

What to do

Operators of affected Boeing 737-700, -800, -900, and -900ER airplanes must perform the required inspections and operational tests by December 10, 2025. If crossed brake hydraulic hoses or wiring issues are found, corrective installations must be completed and tests repeated until successful. Additionally, inspection and test results must be reported to the FAA as specified in the directive.

Summary

The Federal Aviation Administration's Airworthiness Directive 2025-24-02 addresses certain Boeing 737-700, -800, -900, and -900ER series airplanes. This directive mandates inspections and tests of the main landing gear brake hydraulic hoses and wheel speed transducer wiring to correct installation errors that could affect braking performance. The directive aims to prevent runway excursions caused by loss of braking due to crossed hydraulic hoses and interchanged transducer wires.

What changed

This new airworthiness directive introduces requirements for a general visual inspection of the left and right main landing gear brake hydraulic hoses to detect any crossed installations. It also requires operational tests of the antiskid valve and wheel speed transducers, with corrective actions as needed. Additionally, it mandates reporting inspection and test results to the FAA, which was not specified in the original Boeing service bulletin.

Why it matters

This directive is critical for aviation professionals because incorrect installation of brake hydraulic hoses and transducer wiring can lead to antiskid system malfunction and loss of braking capability. Operators and maintenance teams must ensure compliance to avoid runway excursions, which pose serious safety risks. Timely inspections and corrective actions help maintain aircraft safety and regulatory compliance.

What to do

Summary

What changed

Why it matters

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