Airworthiness directives › 2018-12-06
AD 2018-12-06 Airworthiness Directives; The Boeing Company Airplanes
Models named: 787-8, 787-9. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 787-8 and 787-9 airplanes, certificated in any category, as identified in the applicable service information specified in paragraphs (c)(1) and (c)(2) of this AD. (1) Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, dated March 29, 2017 (for Model 787-8 airplanes); (2) Boeing Service Bulletin B787-81205-SB210077-00, Issue 004, dated September 22, 2017 (for Model 787-9 airplanes).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 36 months after the effective date of this AD: Install new pack control unit (PCU) software for the cabin air conditioning and temperature control system (CACTCS) and new CAC outlet pressure sensor J-tube hardware, and do all applicable related investigative and corrective actions; in accordance with the Accomplishment Instructions of the applicable service information specified in paragraph (g)(1) or (g)(2) of this AD. Related investigative and corrective actions must be done before further flight. (1) Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, dated March 29, 2017 (for Boeing Model 787-8 airplanes); or Boeing Service Bulletin B787-81205-SB210077-00, Issue 004, dated September 22, 2017 (for Boeing Model 787-9 airplanes). (2) Boeing Service Bulletin B787-81205-SB210083-00, Issue 001, dated February 9, 2017 (for all airplanes); and Work Packages 2 and 3 of the applicable service information identified in paragraph (g)(1) of this AD.
Unsafe condition
This AD was prompted by a report of an in-service reliability issue involving a latent flow sensor failure combined with single cabin air compressor (CAC) operation. This condition resulted in reduced airflow which led to a persistent single CAC surge condition that caused overheat damage to the CAC inlet. We are issuing this AD to prevent CAC inlet overheating leading to structural degradation of the CAC inlet, fumes in the cabin and flight deck, and interruption to in-service air conditioning.
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