The U.S. Federal Aviation Administration has ordered operators to inspect hundreds of Boeing 737 MAX jets for cracks, warning that undetected damage could reduce an aircraft’s structural integrity if left unchecked.
The new airworthiness directive applies to an estimated 471 U.S.-registered Boeing 737 MAX 8, MAX 9 and MAX 8-200 aeroplanes. The order follows the discovery of cracking on some airframes in a structural reinforcement around the forward service door, located on the right side of the fuselage next to the front galley.
Under the directive, airlines must inspect the affected area on a schedule tied to each aircraft’s accumulated usage and repair any cracking before returning the airplane to service. The FAA said the required inspection intervals are designed to provide multiple opportunities to detect cracks before they could compromise the airframe’s structural integrity.
Crucially, the regulator did not order the affected jets grounded. That distinction keeps the aircraft flying while the phased inspection programme is carried out, avoiding the kind of fleet-wide standstill that has accompanied more severe safety findings on the 737 MAX in the past.
Boeing has already amended its manufacturing process to address the issue on newly built airplanes, meaning the directive is aimed at aircraft already in service rather than jets still coming off the production line. The change means the affected population is finite: the several hundred U.S.-registered MAX aircraft built before the process was updated.
The 737 MAX 8, MAX 9 and MAX 8-200 are the highest-volume members of Boeing’s re-engined narrowbody family and are flown across the United States by a mix of low-cost and network carriers. A structural reinforcement near a service door is part of the load-bearing structure around a fuselage cut-out, an area engineers monitor closely because door surrounds concentrate stress during the pressurisation cycles of everyday flying.
By tying inspection deadlines to how much each jet has flown, the FAA is prioritising the highest-time airframes, which have accumulated the most pressurisation cycles and are therefore the most likely to show early cracking. Operators will fold the checks into scheduled maintenance where possible to limit disruption to flying programmes.
Airworthiness directives of this kind are a routine part of keeping a large in-service fleet safe: when a manufacturer or regulator identifies a recurring defect, an AD makes the corresponding inspection or repair mandatory rather than advisory. For passengers, the practical effect is largely invisible, with the work carried out during normal overnight and line maintenance.
Sources: CNN, FAA. Featured image: AI-generated by AviationShop. By Daniel Okafor.
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