Airworthiness Directives; Honeywell International Inc. ALF502L-2 and ALF502L-2C Turbofan Engines

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The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. ALF502L-2 and ALF502L-2C turbofan engines with certain high-pressure compressor (HPC) first stage discs installed. This proposed AD would require performing a dimensional inspection to determine if excessive disc balance material was removed and a magnetic particle inspection if the disc passes the dimensional inspection. This proposed AD results from reports of discs found with excessive material removed from the balancing material of the disc. We are proposing this AD to prevent the discs from fracturing before reaching the currently published life limit. A disc fracture could result in an uncontained failure of the disc and damage to the airplane.