Every Boeing 757-300 on the U.S. registry, 37 airplanes in all, now falls under a Federal Aviation Administration order to look for cracks in the upper fuselage frames. The FAA published the order as a final rule on October 1, designated Airworthiness Directive 2026-20-04, and it takes effect on November 5, 2026.
The FAA’s concern is cracking in the upper frames around the uppermost fastener common to the fail-safe chord at certain fuselage frame splices. Left undetected, the agency wrote, that cracking could lead to multiple upper frame failures and leave the airplane unable to sustain limit loads, the maximum forces a transport aircraft is designed to see in service.
Inspection steps written into Directive 2026-20-04
The directive, published in the Federal Register as Amendment 39-23477 under docket FAA-2026-2730, applies to all Model 757-300 series airplanes. The FAA estimates 37 of them are on the U.S. registry. Operators must either give the upper frames a general visual inspection or check maintenance records for existing repairs, in the area at the frame splices between stringers S-13 and S-14, running from station 1380 to station 1620 on both sides of the fuselage.
After that comes a repeating detailed inspection of the upper frames around the uppermost fastener at the fail-safe chord. Compliance times are set by Boeing Alert Requirements Bulletin 757-53A0122 RB, dated September 26, 2025, which the rule incorporates by reference. Any crack found must be repaired using a method that Boeing supplies and the FAA approves, and operators that want to substitute their own inspection or fix must seek approval through the agency.
A crack-growth analysis behind the directive
The rule’s stated rationale is a crack-growth analysis showing that the existing maintenance planning data and the supplemental structural inspection program tasks do not give inspectors enough opportunities to catch cracking before a frame fails. The rule is classified as FAA-originated rather than derived from a foreign authority’s directive, and it rests on Boeing-provided analysis. The agency also ruled it not a significant regulatory action under Executive Order 12866 and found no substantial economic impact on small entities, which fits a fleet this small and a bill measured in the low hundreds of thousands of dollars.
The proposal appeared on April 2, 2026, and the agency collected comments until May 18. Boeing backed the text without changes. Aviation Partners Boeing confirmed that its blended-winglet certificate, ST01518SE, does not alter what an operator has to do. United Airlines asked the FAA to fix a typo in the bulletin’s Table 2, where left-side stringer labels S-13L and S-14L should read S-13R and S-14R for the right side, and the agency wrote that correction into the final rule as an exception.
The bulletin predates the proposal by about six months.
Cost estimates and the 757-200 precedent
The FAA’s cost table is small. The first inspection or records check is priced at 70 labor hours at $85 an hour, up to $5,950 per airplane and up to $220,150 across the 37-airplane fleet. Each repeat detailed inspection is priced at four hours, or $340. The proposal had totaled the repeat inspections at $12,580 for each pass across the whole U.S. fleet, and the table counts labor hours only, with no allowance for the days an airplane sits out of service while the upper fuselage is opened up. The agency listed no parts cost and said it has no cost data for the alternative inspections or for repairs after a crack turns up.
The 757-300 is the second airframe in the family to get this treatment. Cracking at the same S-13 to S-14 splice location drove an earlier order for the shorter 757-200, 757-200CB and 757-200PF models, which the FAA adopted in December 2024 with an effective date of January 13, 2025. That rule reaches roughly 456 U.S.-registered airplanes under Boeing Alert Requirements Bulletin 757-53A0115 RB, a figure about twelve times the 757-300 count, and it halves the compliance times for airplanes with certain winglets.
The earlier rule drew pushback from operators that the 757-300 comments, as summarized in the final rule, did not repeat. According to Aerospace Global News, FedEx Express asked for alternative inspection figures and different repeat intervals, and the FAA refused. United called the halved timeframes “excessive and could create an undue burden on the operators,” and the FAA called its approach “conservative and appropriate.”
The 757-300 owners are a short list, and the fleet is old. Delta alone flies 121 757-200 and 757-300 airplanes combined with an average age of 27 years, Airline Geeks reported in 2024, and chief executive Ed Bastian has talked about extending their service lives. The FAA’s contact for technical questions on the directive is aviation safety engineer Wayne Ha at the agency’s Des Moines, Washington, office.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
More from Morning Overview
- Hackers are hijacking outdated home routers, and the FBI named the models to check
- Older Teslas are wearing out in ways early owners never saw coming
- Early electric-car owners are hitting battery and screen failures no one warned them about
- A magnitude 5.3 quake struck off the Oregon coast this week
