Stabilizers - Horizontal Stabilizer Pivot Pin Assemblies - Inspection
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Boeing 787-8, 787-9, and 787-10 airplanes must perform detailed inspections of both left and right horizontal stabilizer pivot pin assemblies for misalignment and incorrect gapping by May 2, 2027, which is 32 months from the effective date. If any discrepancies are found, the affected pivot pin assembly must be replaced as specified. Stakeholders should refer to the corrected Boeing Alert Requirements Bulletin B787-81205-SB550013-00 RB, Issue 001, dated August 30, 2024, and comply with the exceptions noted in the AD.
Summary
Federal Aviation Administration Airworthiness Directive 2025-06-10 is a final rule addressing certain Boeing 787-8, 787-9, and 787-10 airplanes. It mandates inspection of the left and right horizontal stabilizer pivot pin assemblies for misalignment and incorrect gapping. The directive aims to ensure the integrity of the pivot pin lockring, outer pivot pin, and outboard spacer to prevent unsafe conditions.
What changed
This new airworthiness directive introduces mandatory inspections of the horizontal stabilizer pivot pin assemblies on specified Boeing 787 models due to potential misalignment issues discovered during final assembly. It also includes corrections to previously identified errors in the service bulletin, such as clarifications on inspection areas and part numbers. Additionally, the directive sets a compliance time of 32 months and outlines on-condition actions including replacement if misalignment or incorrect gapping is found.
Why it matters
This directive is critical for aviation professionals because misalignment in the horizontal stabilizer pivot pin assemblies can reduce lateral load capacity, risking loss of pivot pin retention parts and potentially leading to loss of the horizontal stabilizer. Operators, maintenance, and compliance teams must address these issues promptly to maintain aircraft safety and regulatory compliance. The directive also clarifies service bulletin errors, facilitating accurate and effective maintenance procedures.
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