FAA Tightens Inspections on Boeing 737s for Safer Flights
Published Date: 11/18/2025
Proposed Rule
Summary
The FAA wants to update safety rules for certain Boeing 737 airplanes to catch cracks and loose parts faster. They’re shortening the time between inspections and changing repair instructions to keep flights safer. Airlines need to comment by January 2, 2026, and should expect some costs for quicker checks and fixes.
Analyzed Economic Effects
5 provisions identified: 0 benefits, 4 costs, 1 mixed.
Faster Inspections for Certain 737s
The FAA would shorten inspection intervals for certain Boeing 737-600, -700, -700C, -800, and -900 series airplanes to find cracks and loose fasteners sooner. The NPRM estimates it would affect 307 U.S.-registered airplanes and costs up to $2,125 per airplane per inspection cycle (up to $652,375 total per inspection cycle for U.S. operators).
Optional Preventive Modification Has Large Upfront Cost
Operators may choose an optional preventive modification that the FAA says costs up to 956 work-hours (at $85/hour) for a parts-minimal cost of $81,260 per airplane, and post-modification inspections cost up to 92 work-hours ($7,820) per inspection cycle. Completing the preventive modification can terminate certain repetitive inspections for the modified area under specified conditions.
Repairs Must Be Done Before Further Flight
If any cracking is found in the inspected areas, the AD requires the operator to repair the cracking using an FAA-approved method before further flight. That means airplanes with cracks cannot fly until repaired.
Stricter Times for Planes with Certain STC
For airplanes that have Supplemental Type Certificate STC ST01697SE, all initial compliance thresholds in flight cycles must be reduced to 1/2 and all repeat interval compliance times in flight cycles must be reduced to 1/4 of the times in Boeing Alert Service Bulletin 737-53A1232, Revision 4 (May 22, 2024). Also, airplanes with STC ST01697SE and a preventive modification installed after 15,000 flight cycles must do investigative and corrective actions before accumulating 25,000 total flight cycles.
Limit on Installing Preventive Modification for Older Airplanes
As of October 30, 2017 (the effective date of AD 2017-19-26), the installation of the preventive modification is prohibited on airplanes that have accumulated more than 30,000 total flight cycles, and on airplanes with STC ST01697SE that have accumulated more than 15,000 total flight cycles.
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Key Dates
Department and Agencies
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