Safety recommendation
NTSB Recommends FAA Action on Engine Blade Repairs
Federal Aviation Administration urged to issue airworthiness directive for inspection of repaired engine components.
The National Transportation Safety Board has recommended that the Federal Aviation Administration issue an airworthiness directive requiring a one-time eddy current inspection of all patch-repaired first-stage compressor rotor blades in Pratt & Whitney JT9D model engines. The directive is based on Pratt & Whitney Special Instruction No. 80F-90. The recommendation is marked as urgent.
Original regulatory source: https://data.ntsb.gov/carol-main-public/sr-details/A-90-007