Federal Register #FAA-2026-2725

FAA Proposed Airworthiness Directive for Boeing 737 Series – FiP Gasket Inspection and Leak Test

This opportunity involves a proposed airworthiness directive (AD) from the Federal Aviation Administration (FAA) targeting specific Boeing 737 series airplanes due to a leak issue at the engine fuel shutoff valve access panel. - Government Buyer: - Federal Aviation Administration (FAA), Department of Transportation - OEM Highlight: - The Boeing Company is the primary OEM referenced - Products/Services Requested: - Inspection and fluid leak testing of the form-in-place (FiP) gasket at the engine fuel shutoff valve access panel - Replacement of the FiP gasket if leaks are found - Compliance with Boeing Alert Requirements Bulletin 737-57A1359 RB - Estimated 1,030 U.S.-registered Boeing 737-700, -700C, -800, and -900ER series airplanes affected - Unique/Notable Requirements: - Detailed inspection for correct sealant installation - Fluid leak test of the engine fuel shutoff valve access panels - On-condition actions: replace FiP gasket and repeat leak test until no leak is found - Strict adherence to Boeing's referenced bulletin for compliance procedures - Locations: - FAA Airworthiness Products Section, Operational Safety Branch, Des Moines, WA (contracting/government office) - Boeing Commercial Airplanes Contractual & Data Services, Seal Beach, CA (OEM support location)

Description

The FAA proposes a new airworthiness directive for certain Boeing 737-700, -700C, -800, and -900ER series airplanes due to a leak through the form-in-place gasket at the engine fuel shutoff valve access panel. The directive requires detailed inspection of the gasket for correct sealant installation, fluid leak testing of the access panels, and applicable on-condition actions such as gasket replacement. This action aims to prevent fuel leaks onto the engine exhaust nozzle that could cause a fire on the ground. Comments on the proposed rule are due by May 11, 2026.

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