Airworthiness directives › 2012-18-17
AD 2012-18-17 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to the following Pratt & Whitney Division (Pratt & Whitney) turbofan engines: (1) PW4000-94″ engine models PW4052, PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, PW4158, PW4460, and PW4462, including those models with any dash number suffix, with a high-pressure compressor (HPC) drum rotor disk assembly listed in Table 1 to paragraph (c) of this AD installed. (2) PW4000-100″ engine models PW4164, PW4168, and PW4168A, with a HPC drum rotor disk assembly listed in Table 1 to paragraph (c) of this AD installed. (3) PW4000-112″ engine models PW4074, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3, with a HPC drum rotor disk assembly listed in Table 1 to paragraph (c) of this AD installed. Table 1 to Paragraph ( c )—Affected HPC Drum Rotor Disk Assemblies Engine models Affected HPC drum rotor disk assembly part numbers PW4000-94″ 50H936; 50H936-002; 53H923-01; 53H923-001; 53H973-01; 53H973-001; 54H803-01; 54H803-001; 54H803-002; 56H013-01; 56H013-001; 58H236-01 PW4000-100″ 53H973-01; 53H973-001; 54H803-01; 54H803-001; 54H803-002; 56H013-01; 56H013-001; 58H236-01 PW4000-112″ 55H722-01; 55H410-01; 57H010-01; 57H210-01; 57H610-01; 57H910-01
Compliance
(1) Perform a local fluorescent penetrant inspection for cracks in the HPC drum rotor disk assembly rear drum blade loading and locking slots of the specific stages of the HPC drum rotor disk assemblies from which any of the blades are removed as specified in Table 2 to paragraph (f) of this AD. Table 2 to Paragraph ( f )—Compliance Times and Service Bulletins by Engine Model For engine model Inspect whenever . . . To inspect, use . . . PW4074, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 Any of the HPC 13th or 14th stage blades are removed during a shop visit Paragraphs 1.A. through 1.B. of the Accomplishment Instructions of PW4G-112-72-264, Revision 2, dated February 23, 2010. PW4164, PW4168, and PW4168A Any of the HPC 13th, 14th, or 15th stage blades are removed during a shop visit Paragraphs 1.A. through 1.C of the Accomplishment Instructions of PW4G-100-72-186, Revision 1, dated September 2, 2004. PW4052, PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, PW4158, PW4460, and PW4462 Any of the HPC 13th, 14th, or 15th stage blades are removed during a shop visit Paragraphs 1.A. through 1.C. of the Accomplishment Instructions of PW4ENG 72-796, dated June 11, 2009. (2) Remove from service any HPC drum rotor disk assembly rear drum found with a crack in any of the blade loading and locking slots.
Required actions
At the next piece-part exposure of the HPC drum rotor disk assembly after the effective date of this AD: (1) Replace the 13th, 14th, and 15th stage HPC seals with redesigned HPC seals of engines listed in paragraph (c)(1) of this AD in accordance with paragraphs 1.A through 1.C of the Accomplishment Instructions of Pratt & Whitney Service Bulletin (SB) No. PW4ENG 72-816, Revision 1, dated June 12, 2012. (2) Replace the 13th, 14th, and 15th stage HPC seals with redesigned HPC seals of engines listed in paragraph (c)(2) of this AD in accordance with paragraphs 1.A through 1.C of the Accomplishment Instructions of Pratt & Whitney SB No. PW4G-100-72-240, Revision 1, dated June 12, 2012.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done.
Affected ADs
This AD supersedes AD 2010-18-13, Amendment 39-16427 (75 FR 55459, September 13, 2010).
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