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AD: Pratt & Whitney Division Turbofan Engines

AD NUMBER: 2018-02-10

PRODUCT: All Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines.

ACTION: Final Rule.

SUMMARY: This AD was prompted by the discovery of multiple cracked outer diffuser cases.

This AD requires initial and repetitive inspections to detect cracks in the outer diffuser case and removal from service of cases that fail inspection.

DATES: This AD is effective February 26, 2018.

COST: The FAA estimates that this AD affects 121 engines installed on airplanes of U.S. registry. The cost of compliance is estimated as follows:

  • Tt3 boss inspection: 3.5 work-hours × $85 per hour = $297.50 per engine.
  • FPI Inspection of outer diffuser case: 10 work-hours × $85 per hour = $850 per engine
  • Replacement of outer diffuser case: $750,000 per engine
FMI: AD

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