Airworthiness directives › 2020-06-14
AD 2020-06-14 Airworthiness Directives; The Boeing Company Airplanes
Models named: 787-8, 787-9, 787-10. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as specified by paragraph (h) of this AD: At the applicable times specified in paragraph 5., “Compliance,” of Boeing Alert Service Bulletin B787-81205-SB420045-00, Issue 002, dated February 14, 2020, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin B787-81205-SB420045-00, Issue 002, dated February 14, 2020.
Unsafe condition
This AD was prompted by a report that the stale-data monitoring function of the common core system (CCS) may be lost when continuously powered on for 51 days. This could lead to undetected or unannunciated loss of common data network (CDN) message age validation, combined with a CDN switch failure. The FAA is issuing this AD to address this condition, which could result in erroneous flight-critical data being routed and displayed as valid data, and could reduce the ability of the flightcrew to maintain the safe flight and landing of the airplane.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1