Resumen
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines with a low-pressure compressor (LPC) fan hub, part number (P/N) 51B821 or P/N 52B521, installed. This AD was prompted by updated low-cycle fatigue analysis techniques that indicate certain LPC fan hubs could crack before their published life limit. This AD requires repetitive eddy current inspections (ECIs) and fluorescent penetrant inspections (FPIs) for cracks in certain LPC fan hubs and removal of LPC fan hubs from service that fail inspection. We are issuing this AD to address the unsafe condition on these products.
Detalles de la directiva
Número de AD
FAA-2018-0368
Número de documento
2018-23712
Tipo
Rule
Fecha de publicación
October 31, 2018
Fecha de entrada en vigor
December 5, 2018
Fabricante afectado
Pratt & Whitney Division (PW) Turbofan
Criticidad
routine
Emergencia
No
Docket ID
Docket No. FAA-2018-0368
Temas
Documentos oficiales
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