Airworthiness Directive · Amendment 39-21911 · Main landing gear
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 787-8, 787-9, and 787-10 airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. This AD was prompted by a report that during a fleet sampling inspection, cracks were found on the inner cylinder pivot pins of the left and right main landing gear (MLG) on one of the airplanes. This AD requires repetitive lubrications of the left and right MLG truck beams and inner cylinder pivot joints; a review of the maintenance program documentation to verify that certain lubrication tasks are incorporated; repetitive inspections of the MLG inner cylinder pivot pins and inner cylinder bushings of the MLG truck beams and inner cylinder joints to detect friction, heat damage, excessive wear, cracking, and smearing of bushing material; and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020. Actions identified as terminating action in Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020, terminate the applicable required actions of this AD, provided the terminating action is done in accordance with the Accomplishment Instructions of Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin B787-81205-SB320045-00, Issue 001, dated November 9, 2020, which is referred to in Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020.
(1) Where Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020, uses the phrase “the Issue 001 date of Requirements Bulletin B787-81205-SB320045-00 RB,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020, specifies contacting Boeing for repair instructions: This AD requires doing the repair using a method approved in accordance with the procedures specified in paragraph (l) of this AD.
(3) Where the action for “CONDITION 2” in Table 7 of the “Compliance” paragraph of Boeing Alert Requirements Bulletin B787-81205-SB320045-00 RB, Issue 001, dated November 9, 2020, specifies “Do a detailed FPI inspection of the inner cylinder lug bore for heat and friction damage,” for this AD, the action is “Do a detailed and FPI inspection on the inner cylinder lug bore for heat and friction damage.”
Revising the existing maintenance or inspection program, as applicable, to incorporate the information in CMR item number 32-CMR-01 of Section G, “Certification Maintenance Requirement Tasks,” of Boeing 787 Certification Maintenance Requirements (CMRs), D011Z009-03-03, dated June 2020, terminates the repetitive lubrications required by paragraph (g) of this AD.
After the existing maintenance or inspection program has been revised as required by paragraph (i) of this AD, no alternative actions (e.g., inspections) and intervals may be used unless the actions and intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (l) 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.
