EASA AD US-2025-02-07
Navigation - Aeroplane Flight Manual - Revision / Software Installation
Summary
Airworthiness Directive 2025-02-07 is a final rule issued by the Federal Aviation Administration addressing certain Boeing airplanes including Model MD-11, MD-11F, 717-200, 737-600 through 737-9 series, 747-400 series, 757, 767, and 777. The directive focuses on updating the Aeroplane Flight Manual and installing updated multimode receiver (MMR) operational software to address issues with Coordinated Universal Time calculation errors and simultaneous MMR resets. This affects airplanes equipped with Collins GLU-2100 MMR part number 822-2532-100 with software versions earlier than COL4C-0087-0003.
What Changed
This AD supersedes AD 2020-03-20 by removing one airplane model from applicability and adding a requirement to install updated MMR operational software. It clarifies affected airplane configurations and MMR software versions to ensure only airplanes with the specified Collins GLU-2100 MMR and earlier software versions are subject to the new requirements. The AD also provides provisions for removing previous flight manual limitations after software installation.
Why It Matters
This directive addresses critical safety concerns related to loss of GPS data and degraded positional accuracy that could lead to controlled flight into terrain during high-precision approaches. It also mitigates risks of simultaneous MMR resets that increase air traffic control workload and reduce airplane separation, potentially causing mid-air collisions. Compliance ensures continued airworthiness and operational safety for affected Boeing fleets.
What To Do
Operators must revise the Aeroplane Flight Manual to include specified limitations and install the updated Collins GLU-2100 MMR software version COL4C-0087-0003 or later. Compliance with these actions is mandatory by March 17, 2025. Stakeholders should review their fleet configurations to identify affected airplanes and coordinate with Boeing or FAA resources for software installation and documentation updates.