EASA AD US-2026-12-07: Auto Flight - Mode Control Panel - Replacement

What to do

Operators of Boeing 787-8, 787-9, and 787-10 airplanes must replace the existing MCP with the updated MCP and conduct the required installation test by July 20, 2026. They should coordinate with Boeing and Honeywell for parts and retrofit options, considering warranty coverage. Compliance documentation should be maintained as per FAA requirements.

Summary

The Federal Aviation Administration's Airworthiness Directive 2026-12-07 is a final rule addressing certain Boeing 787-8, 787-9, and 787-10 airplanes. It mandates replacement of the existing mode control panel (MCP) with an updated version to prevent uncommanded changes to the MCP selected altitude. This directive aims to enhance flight safety by mitigating risks of controlled flight into terrain or mid-air collisions.

What changed

This new airworthiness directive introduces a requirement to replace affected MCP part numbers 4091640-901, 4091640-902, and 4091640-903 with an updated MCP (P/N 4091640-904) and to perform an installation test. It does not prohibit installation of affected parts but expects operators to retrofit or replace them. The directive also clarifies compliance costs and addresses comments received during the rulemaking process.

Why it matters

This AD is critical for operators and maintenance organizations as it addresses a safety issue that could lead to uncommanded altitude changes, potentially causing controlled flight into terrain or traffic conflicts. Compliance ensures continued airworthiness and operational safety of Boeing 787 aircraft equipped with the affected MCPs. Understanding the cost implications and warranty coverage helps operators plan maintenance and budgeting effectively.

What to do

Summary

What changed

Why it matters

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