Air Conditioning - Cabin Air Compressor Outlet Check Valves - Installation
- Published
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Boeing 787-8 and 787-9 airplanes must install the new inboard and outboard cabin air compressor outlet check valves as specified in Boeing Service Bulletin B787-81205-SB210108-00, Issue 002. They must also ensure that prohibited parts, including P/N 7010105H01, are not installed on any airplane. The compliance deadline for these actions is October 8, 2020.
Summary
Federal Aviation Administration Airworthiness Directive 2020-17-13 is a final rule addressing certain Boeing 787-8 and 787-9 airplanes. It requires the installation of new inboard and outboard cabin air compressor outlet check valves on the left and right cabin air conditioning and temperature control system packs. This directive responds to failures of the existing check valves caused by fatigue of aluminum flappers, which exposed the Y-duct to temperatures beyond its design limits.
What changed
This new airworthiness directive introduces a mandatory replacement of the cabin air compressor outlet check valves with improved parts to prevent fatigue failure. It also prohibits installation of certain part numbers, including P/N 7010105H01, and requires marking modifications on the CACTCS pack identification plates. The directive clarifies installation and marking requirements based on updated Boeing service bulletins.
Why it matters
This directive is critical for aviation professionals because failure of the cabin air compressor outlet check valves can lead to smoke and fumes entering the flight deck and passenger cabin, potentially impairing crew performance and causing passenger discomfort or respiratory distress. Compliance ensures continued airworthiness and safety of the affected Boeing 787 aircraft by preventing exposure to unsafe temperatures and off-gassing materials.
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