Resumo
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.
Detalhes da diretiva
Número da AD
FAA-2018-0368
Número do documento
2018-23712
Tipo
Rule
Data de publicação
October 31, 2018
Data de vigência
December 5, 2018
Fabricante afetado
Pratt & Whitney Division (PW) Turbofan
Criticidade
routine
Emergência
Não
Docket ID
Docket No. FAA-2018-0368
Tópicos
Documentos oficiais
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