Airworthiness Directive · Amendment 39-19310 · Air conditioning
The Boeing Company Airplanes
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).
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 787-8 and 787-9 airplanes. This AD was prompted by a report of an in-service reliability issue of 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. This AD requires installing 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 doing related investigative and corrective actions if necessary. We are issuing this AD to address the unsafe condition on these products.
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.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
