Boeing 737 Fuel Leak Fix: FAA Proposes Gasket Inspections for Safety
Published Date: 3/23/2026
Proposed Rule
Summary
The FAA wants to make sure certain Boeing 737 airplanes don’t have fuel leaks caused by a faulty gasket near the engine fuel shutoff valve. They’re asking airlines to inspect the gasket and test for leaks, fixing any problems found. Comments are open until May 7, 2026, and these checks help keep flights safe without big costs if done on time.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
FAA proposes mandatory 737 gasket inspections
The FAA proposes inspections and fluid leak tests of the form-in-place (FiP) gasket at the engine fuel shutoff valve access panel on Boeing Model 737-8, 737-9, and 737-8200 airplanes, using Boeing Alert Requirements Bulletin 737-57A1358 RB dated November 17, 2025. If a leak or damage is found, operators must perform on-condition actions such as replacing the FiP gasket, repairing preformed seals, or installing a removable fay seal and repeat the leak test until no leak is found. Comments on the proposed rule are due by May 7, 2026.
Estimated compliance and repair costs
The FAA estimates the proposed AD would affect 433 U.S.-registered airplanes. Routine inspections and leak tests are estimated at 1 work-hour each at $85 per airplane (cost on U.S. operators per action up to $36,805 for the fleet). On-condition replacements are estimated up to 3 work-hours ($255) plus parts up to $1,000, for a total up to $1,255 per airplane, and some costs may be covered under warranty.
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