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Thu, Jun 14, 2018

AD: The Boeing Company Airplanes

AD NUMBER: 2018-12-06

PRODUCT: Certain Boeing Model 787-8 and 787-9 airplanes.

ACTION: Final Rule.

SUMMARY: 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.

DATES: This AD is effective July 16, 2018.

COST: The FAA estimates  that this AD affects 62 airplanes of U.S. registry. The estimated costs of compliance are as follows:

  • Software Installation - $85 per aircraft for one hour labor.
  • Modify Left and Right Inboard and Outboard CAC Modules - $24,521 per aircraft for parts and labor.
FMI: AD

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