Airworthiness Directive · Amendment 39-19680 · Hydraulic power
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 737 series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737 series airplanes. This AD was prompted by a report that structural fatigue cracks can develop in certain aluminum pressure module check valves prior to the design limit. This AD requires an inspection to determine the part numbers of the four hydraulic systems A and B pressure module check valves and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.
(1) For airplanes identified as Group 1 in Boeing Special Attention Requirements Bulletin 737-29-1127 RB, dated October 8, 2018: Within 120 days after the effective date of this AD, inspect the airplane and do all applicable on-condition actions using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
(2) Except as specified by paragraph (h)(3) of this AD: For airplanes identified as Groups 2 and 3 in Boeing Special Attention Requirements Bulletin 737-29-1127 RB, dated October 8, 2018, at the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Requirements Bulletin 737-29-1127 RB, dated October 8, 2018, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Requirements Bulletin 737-29-1127 RB, dated October 8, 2018.
Note 1 to paragraphs (g)(2) through (g)(4): Guidance for accomplishing the actions required by this AD can be found in Boeing Special Attention Service Bulletin 737-29-1123, dated October 2, 2018; Boeing Special Attention Service Bulletin 737-29-1126, dated October 2, 2018; and Boeing Special Attention Service Bulletin 737-29-1127, dated October 8, 2018; as applicable; which are referred to in Boeing Special Attention Requirements Bulletin 737-29-1123 RB, dated October 2, 2018; Boeing Special Attention Requirements Bulletin 737-29-1126 RB, dated October 2, 2018; and Boeing Special Attention Requirements Bulletin 737-29-1127 RB, dated October 8, 2018; respectively.
(3) Except as specified by paragraph (h)(1) of this AD: For Model 737-600, -700, -700C, -800, -900, and -900ER airplanes that have an original airworthiness certificate or export certificate of airworthiness issued on or before the effective date of this AD; at the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Requirements Bulletin 737-29-1123 RB, dated October 2, 2018, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Requirements Bulletin 737-29-1123 RB, dated October 2, 2018.
(4) Except as specified by paragraph (h)(2) of this AD: For Model 737-8 and 737-9 airplanes that have an original airworthiness certificate or export certificate of airworthiness issued on or before the effective date of this AD; at the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Requirements Bulletin 737-29-1126 RB, dated October 2, 2018, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Requirements Bulletin 737-29-1126 RB, dated October 2, 2018.
For purposes of determining compliance with the requirements of this AD:
(1) Where Boeing Special Attention Requirements Bulletin 737-29-1123 RB, dated October 2, 2018, uses the phrase “the original issue date of Requirements Bulletin 737-29-1123 RB,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Special Attention Requirements Bulletin 737-29-1126 RB, dated October 2, 2018, uses the phrase “the original issue date of Requirements Bulletin 737-29-1126 RB,” this AD requires using “the effective date of this AD.”
(3) Where Boeing Special Attention Requirements Bulletin 737-29-1127 RB, dated October 8, 2018, uses the phrase “the original issue date of Requirements Bulletin 737-29-1127 RB,” this AD requires using “the effective date of this AD.”
