Airworthiness Directive · Amendment 39-23197 · Landing gear
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 737-700, -800, -900, and -900ER series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14, 2025.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-700, -800, -900, and -900ER series airplanes. This AD was prompted by a report of a runway excursion caused by loss of braking. An inspection found that the right main landing gear (MLG) hydraulic hoses for the brakes were incorrectly installed at the flow limiters, and the left MLG wheel speed transducer wires were also interchanged. This AD requires a general visual inspection (GVI) of the left and right MLG brake hydraulic hoses for any crossed installation, antiskid valve and transducer operational tests, 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 737-32A1599 RB, dated October 14, 2025, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14, 2025.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 737-32A1599, dated October 14, 2025, which is referred to in Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14, 2025.
Where the “Effectivity” paragraph and Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14, 2025, refer to the original issue date of Requirements Bulletin 737-32A1599 RB, this AD requires using the effective date of this AD.
For airplanes identified as Group 1, Configuration 3 through 5, in Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14, 2025, on which any of the findings specified in paragraphs (i)(4) through (6) of this AD were found during any inspection or test required by paragraph (g) of this AD: Submit a report within 30 days after the inspection or test, or within 30 days after the effective date of this AD, whichever occurs later. The report must include the items specified in paragraphs (i)(1) through (6) of this AD. Submit the report to Boeing Service Engineering by sending a service request using the Boeing Communication System (BCS).
(1) Airplane line number.
(2) Date of most recent accomplishment of any service bulletin listed in Appendix A of Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14, 2025.
(3) The number of flight cycles between the most recent accomplishment of any service bulletin listed in Appendix A of Boeing Alert Requirements Bulletin 737-32A1599 RB, dated October 14, 2025, and the date that the inspection or test was completed.
(4) All crossed brake hydraulic hoses found during the general visual inspection for crossed brake hydraulic hoses.
(5) Operational test failures of the antiskid valve operational tests.
(6) Operational test failures of the transducer operational tests.
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
