Airworthiness Directive · Amendment 39-22373 · Hydraulic power
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. This AD was prompted by reports of ram air turbine (RAT) pump barrel assembly failures, which caused the RAT to fail to provide hydraulic power. The failures were determined to be caused by variations in the bronze metal used during manufacturing, which can result in varying fatigue properties. This AD requires an inspection or records review to determine the part number of the RAT pump and control module (PCM) and of the RAT assembly, and replacement of any RAT PCM or any RAT assembly having certain part numbers. This AD also prohibits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.
For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before the effective date of this AD: Within 60 months after the effective date of this AD, inspect the RAT pump and control module (PCM) and the RAT assembly to determine the part number. A review of airplane maintenance records is acceptable in lieu of this inspection if the RAT PCM and the RAT assembly part numbers can be conclusively determined from that review.
If, during the inspection required by paragraph (g), any RAT PCM having part number (P/N) 7001267H06 or any RAT assembly having P/N 7000011H08 is found: Except as specified by paragraph (i) of this AD, at the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin B787-81205-SB290039-00 RB, Issue 002, dated October 26, 2021, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin B787-81205-SB290039-00 RB, Issue 002, dated October 26, 2021.
Note 1 to paragraph (h): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin B787-81205-SB290039-00, Issue 002, dated October 26, 2021, which is referred to in Boeing Alert Requirements Bulletin B787-81205-SB290039-00 RB, Issue 002, dated October 26, 2021.
Where Boeing Alert Requirements Bulletin B787-81205-SB290039-00 RB, Issue 002, dated October 26, 2021, uses the phrase “the Issue 001 date of Requirements Bulletin B787-81205-SB290039-00 RB,” this AD requires using “the effective date 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.
