FAA Proposes Regular Checks for Pratt Engine Cracks
Published Date: 6/6/2025
Proposed Rule
Summary
The FAA wants to keep certain Pratt & Whitney engines safe by checking for cracks in key parts regularly. If cracks show up, those parts must be fixed or replaced to avoid engine trouble. This affects specific engine models and could mean some maintenance costs and scheduled inspections soon.
Analyzed Economic Effects
3 provisions identified: 1 benefits, 1 costs, 1 mixed.
Addresses Risk of Engine Separation
The proposed AD was prompted by an event where an IAE PW1127GA-JM engine experienced an HPC 7th-stage IBR separation that caused an aborted takeoff; the FAA says the AD is proposed to address that unsafe condition on the listed Pratt & Whitney engines. The action aims to reduce the risk of in-flight or takeoff-related engine failures.
Mandatory AUSI Inspections for PW Engines
The FAA proposes a new airworthiness directive requiring repetitive angle ultrasonic scan inspections (AUSIs) of the HPC 15th-stage disks, front turbine hubs, HPT 1st-stage air seals, and HPT 2nd-stage hubs on Pratt & Whitney Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. If inspections show cracks, the parts must be removed from service and replaced.
Mandatory Replacement for Certain Serial Numbers
For certain serial numbers, the proposed AD would require removal from service and replacement of the HPT 1st-stage air seal on the listed Pratt & Whitney engine models. The requirement applies only to those specific serial-numbered parts.
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