EASA AD US-2026-17-02 — Wings - Lower Outboard Wing Skin - Inspections

Summary

The Federal Aviation Administration Airworthiness Directive 2026-17-02 is a final rule addressing certain Boeing 787-8, 787-9, and 787-10 airplanes. It mandates inspections of the lower outboard wing skins due to manufacturing errors and excessive preload forces that may cause fatigue cracks at fastener holes. The directive requires repetitive ultrasonic and detailed inspections of specific wing splice plates and fittings to ensure structural integrity.

What Changed

This new airworthiness directive introduces mandatory repetitive ultrasonic and detailed inspections of the lower side of body splice plates, rear spar terminal fittings, lower chords, front spar terminal fittings, and jack pads on affected Boeing 787 models. It also requires on-condition corrective actions such as repairs if cracks are detected. The directive revises material citations to include the full bulletin number and clarifies compliance time tracking requirements.

Why It Matters

This directive is critical for aviation professionals because it addresses a potential structural safety risk caused by manufacturing defects that could lead to fatigue cracks in primary wing structures. Operators and maintenance teams must implement the inspection and repair requirements to prevent structural failure and ensure continued safe flight and landing. Compliance helps avoid costly unplanned repairs and enhances overall fleet safety.

What To Do

Operators of Boeing 787-8, 787-9, and 787-10 airplanes must perform the required ultrasonic and detailed inspections as specified in Boeing Alert Requirements Bulletin B787-81205-SB570048-00 RB, Issue 001, starting no later than October 1, 2026. They must continue repetitive inspections and carry out any necessary repairs if cracks are found. Compliance with the directive's inspection intervals and procedures is mandatory to maintain airworthiness.