AD NUMBER: 2005-25-05

MANUFACTURER: Pratt & Whitney
SUBJECT: Airworthiness Directive 2005-25-05
SUMMARY: The FAA is superseding an existing airworthiness directive (AD) for Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR series turbofanengines. That AD currently requires revisions to the engine manufacturer's time limits section(TLS) to include enhanced inspection of selected critical life-limited parts at each piece-partopportunity. This AD modifies the airworthiness limitations section of the manufacturer's manualand an air carrier's approved continuous airworthiness maintenance program to add an eddycurrent inspection. An FAA study of in-service events involving uncontained failures of criticalrotating engine parts has indicated the need for mandatory inspections. The mandatoryinspections are needed to identify those critical rotating parts with conditions, which if allowed tocontinue in service, could result in uncontained failures. We are issuing this AD to prevent criticallife-limited rotating engine part failure, which could result in an uncontained engine failure anddamage to the airplane.

FMI: AD NUMBER: 2005-25-05