FAA Proposes Extra Checks for Cracked Boeing 737 Planes
Published Date: 4/23/2026
Proposed Rule
Summary
The FAA wants to update safety checks for certain Boeing 737 airplanes because cracks were found beyond the usual inspection spots. This means more planes will need extra inspections to keep flying safe. Airlines should get ready to follow these new rules soon, which might cost some time and money but will keep passengers safe.
Analyzed Economic Effects
4 provisions identified: 1 benefits, 3 costs, 0 mixed.
New extended inspections required
The proposed AD would add inspections for an extended inspection area, including inspections of the bear strap, fuselage skin, gap cover, and the forward galley door stub frame, per Boeing Alert Requirements Bulletin 737-53A1383 RB, Revision 3 (dated July 30, 2025). The FAA estimates the rule would affect 1,965 U.S.-registered airplanes and estimates inspection labor of up to 28 work-hours (up to $2,380) for the retained action and up to 25 work-hours (up to $2,125) for the new stub frame inspection, with aggregate estimated costs up to $4,676,700 and $4,175,625 respectively.
Addresses risk of decompression and structural failure
The AD is intended to address cracking of the fuselage skin, bear strap, and stub frame that could result in severing of the bear strap and possibly lead to uncontrolled decompression and loss of structural integrity of the airplane. The proposed inspections and corrective actions are intended to reduce that safety risk for flights operated with the affected airplanes.
Applicability expanded to 737-900ER
This proposed AD now applies to all Boeing Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes certificated in any category. The FAA explicitly adds Model 737-900ER airplanes and airplanes having line numbers 1763 and subsequent to the applicability. Comments on the proposal are due by June 8, 2026.
On‑condition repairs and estimated repair costs
If inspections find cracks, on-condition actions include HFEC and LFEC inspections, repetitive HFEC inspections, repairs, and replacement. The NPRM provides per-product estimates: external HFEC/LFEC inspection up to 28 work-hours (up to $2,380), HFEC inspection up to 27 work-hours (up to $2,295 per inspection cycle), and stub frame replacement showing 35 work-hours (labor $2,975) plus parts ($4,375). The FAA states it has no definitive data to estimate costs for bear strap replacement and other on-condition actions.
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Key Dates
Department and Agencies
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