Federal Register #FAA-2026-8811

FAA Airworthiness Directive Proposal for Boeing 737 Elevator Buss Assembly Bearings

The Federal Aviation Administration (FAA), under the Department of Transportation, is proposing a new airworthiness directive for Boeing 737-8, 737-9, and 737-8200 airplanes to address safety concerns related to elevator buss assembly bearings. - Government Buyer: - Federal Aviation Administration (FAA) - Aircraft Certification Service - OEM Highlight: - The Boeing Company is the sole OEM referenced - Products/Services Requested: - Inspection of elevator buss assembly bearings and bearing housings for cracks and proper sealant application - Push-out load tests and on-condition actions as needed - Replacement of bearings with specific Boeing part numbers: - BACB10HY08CNJP - BACB10HY10CNJP - BACB10JG12AZJ03G - Replacement of elevator buss assemblies if required - Quantities: - 95 U.S.-registered Boeing 737-8, 737-9, and 737-8200 airplanes affected - Unique Requirements: - Inspections must follow procedures outlined in Boeing Alert Requirements Bulletin 737-27A1331 RB - Corrective actions are mandatory if cracks or missing sealant are found - Focus is on flight safety and prevention of premature crank arm failure - No other OEMs or vendors are mentioned

Description

The FAA proposes a new airworthiness directive (AD) for certain Boeing Model 737-8, 737-9, and 737-8200 airplanes due to potential incorrect installation of bearings in the elevator buss assembly during production. The AD would require detailed inspections of the elevator buss assembly bearings and bearing housings for cracks and sealant application, along with applicable on-condition actions such as push-out load tests and replacements. This action addresses an unsafe condition that could impact elevator pitch control and affect continued safe flight and landing of the airplane. Comments on the proposal are invited until November 5, 2026.

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