AD 2020-17-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The cabin air compressor (CAC) outlet check valve failed due to fatigue of the aluminum flappers, and exposed the Y-duct to temperatures above its design limit.
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Required Actions
Installing new inboard and outboard CAC outlet check valves on the left-side and right-side cabin air conditioning and temperature control system (CACTCS) packs. Mark the MOD DOT number on the CACTCS pack identification plate. Part mark an `X' on the applicable number in the MOD DOT area of the identification plate for CACTCS pack configuration H05 and H09 only.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 787-8 and 787-9 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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