Airworthiness directives › 2014-17-08R1
AD 2014-17-08R1 Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines
Applicability*9
This AD applies to all Pratt & Whitney Canada Corp. (P&WC) PT6A-114 and PT6A-114A turboprop engines.
Compliance
Performance of the metallurgical examination specified in paragraph (e)(1)(iii)(B) of this AD on CT blades other than P&WC single crystal CT blades, P/N 3072791-01, 3072791-02, or 3079351-01, before the effective date of this AD fulfills the initial inspection requirements of paragraph (e)(1)(i) of this AD. However, you must still comply with the repetitive BSI requirement of paragraph (e)(1)(ii) of this AD until you complete the mandatory terminating action of paragraph (e)(3) of this AD.
Required actions
(1) AMOCs previously approved for AD 2014-17-08, Amendment 39-17961 (79 FR 52172, September 3, 2014) are approved for this AD. (2) The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. You may email your request to: ANE-AD-AMOC@faa.gov.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. (1) For engines installed with CT blades other than P&WC single crystal CT blades, part numbers (P/Ns) 3072791-01, 3072791-02, or 3079351-01, do the following: (i) Until removed, per the requirements of this AD, borescope inspect the CT blade leading and trailing edges, within the following intervals, whichever occurs later: (A) 150 operating hours after October 8, 2014; or (B) 500 operating hours since new; or (C) 500 operating hours since last borescope inspection (BSI) of the CT blades; or (D) Before next flight after the effective date of this AD. (ii) Thereafter, repeat the inspection required by paragraph (e)(1)(i) of this AD every 500 flight hours time since last inspection. (iii) At the next hot section inspection (HSI) after the effective date of this AD, and each HSI thereafter, replace the complete set of CT blades with any of the following: (A) New CT blades; (B) CT blades that have passed a two-blade metallurgical inspection. Use paragraph 3.B., Accomplishment Instructions, of P&WC Service Bulletin (SB) No. PT6A-72-1669, Revision 9, dated June 28, 2013, to do the inspection; or (C) P&WC single crystal CT blades, P/N 3072791-01, 3072791-02, or 3079351-01. (2) Replacement of the complete set of CT blades with single crystal CT blades, P/N 3072791-01, 3072791-02, or 3079351-01 is terminating action for the requirements of paragraph (e)(1) of this AD. (3) By October 8, 2017, replace the complete set of CT blades with P&WC single crystal CT blades, P/N 3072791-01, 3072791-02, or 3079351-01.
Affected ADs
This AD replaces AD 2014-17-08, Amendment 39-17961 (79 FR 52172, September 3, 2014).
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