The Federal Aviation Administration estimates that 215 Pratt & Whitney geared turbofan engines installed on U.S.-registered aircraft carry a compressor defect that could end in an uncontained part release. The FAA published a proposed airworthiness directive on September 17 that would force operators to look inside those engines with borescopes, and eventually to replace a set of small bushings.
The defect is metal contacting metal inside the high-pressure compressor, and the agency’s own count of it is six reports. Six is a small number, but each one involved a rotor that had been touched by hardware that should never reach it.
Six shop findings and a worn bushing set
In the Federal Register notice, the FAA says it received six reports of “clashing found on either the HPC 2nd stage rotor or 3rd stage rotor caused by contact with the HPC variable stator vanes.” Variable stator vanes are the small pivoting blades that steer air onto the compressor rotors, and each pivots on bushings. The agency’s finding is that wear in the bushing set lets the vanes rock forward into the rear rim of a rotor.
The FAA states the consequence in one sentence: the condition “could result in uncontained part release, damage to the engine, damage to the airplane, and loss of control of the airplane.” An uncontained release means fragments leave the engine case, which is the failure that engine certification is designed to prevent.
Inspections the proposed directive would order
Operators would perform initial and repetitive borescope inspections of the first-, second- and third-stage compressor rotor rear rim surfaces for wear, scratching or contact, replace any damaged rotors, and swap the vane bushing set as the terminating action. The first inspection would come before an engine reaches 8,000 flight hours, and repeats would follow every 1,000 hours until the bushings are replaced. A borescope is a slim camera probe threaded into the engine through an access port, which lets a technician examine the rotor surfaces without pulling the compressor apart, and that is why the agency can price each look at only three hours of labor. The expensive step is the bushing replacement, and it is the one that ends the inspection cycle for good.
The FAA prices the work in the same notice. A borescope inspection is three hours of labor at $85 an hour, or $255 per engine, which totals $54,825 across the 215 engines. Replacing the bushing set costs $20,385 per engine, mostly parts, for a fleet total of $4,382,775. Rotors found damaged would cost far more: up to $316,050 for a first-stage rotor and $258,950 for a third-stage rotor, figures the agency lists as on-condition costs that depend on what the borescope shows.
The agency describes the proposal as provisional. It “considers that this proposed AD would be an interim action,” it says, because “the manufacturer is currently developing additional mitigations that will address the unsafe condition.” The notice cites two Pratt & Whitney alert service bulletins dated July 13, 2026, so the company’s own inspection instructions came out two months before the FAA moved. FlightGlobal reported that the proposal would mandate inspections already specified by P&W in service bulletins, turning a company recommendation into a legal requirement.
Which engines and aircraft are in the frame
The notice covers the PW1500G and PW1900G series. The PW1500G powers the Airbus A220, and the PW1900G powers Embraer’s E190-E2 and E195-E2, according to a summary of the proposal by aviation site Fliegerfaust, which also notes that the A320neo’s PW1100G-JM engine is outside this proposal. The 215 engines counted by the FAA are only those on U.S. registers; the worldwide fleet is larger.
This family has been inspected before. In January 2024, AirInsight reported on an FAA proposal covering about 430 U.S.-registered engines, mostly on A220s flown by Delta Air Lines, JetBlue and Breeze Airways, over contaminated powder-metal parts. That became AD 2024-06-04, effective April 11, 2024, requiring ultrasonic inspections and accelerated part replacement. A separate 2021 directive, effective September 22, 2021, addressed cracking of the compressor rotor shaft on roughly 88 U.S. engines.
Each of those earlier actions had a different mechanism, which makes the geared turbofan a repeat customer of the directive process rather than a one-off. The 2021 action listed thirteen model designations, from the PW1519G through the PW1923G-A, the same range the current proposal spans. The current one is wear-driven contact between vanes and rotors, and the FAA has left the door open to a further fix once Pratt & Whitney finishes its own. Carol Nguyen, an FAA aviation safety engineer, is the agency’s named contact for technical questions, and comments on the proposal are due by October 19, 2026, after which the FAA can finalize, change or withdraw the requirement.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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