Airworthiness Directive · Amendment 39-18431 · Pratt & Whitney Canada Corp. Turboprop Engines
Pratt & Whitney Canada Corp. Turboprop Engines
This AD applies to Pratt & Whitney Canada Corp. (P&WC) PT6A-60AG, BS919 and BS1048 with pre-Service Bulletin (S.B.) No. PT6A-72-13402, dated August 12, 2005 configuration; PT6A-65AG, BS708, BS903, BS1101, and BS1102 with pre-S.B. No. PT6A-72-13408, dated July 3, 2006 configuration; PT6A-67AF; and PT6A-67AG turboprop engines with Woodward fuel control units (FCUs), installed.
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Canada Corp. (P&WC) PT6A-60AG, -65AG, -67AF, and -67AG turboprop engines. This AD requires removing Woodward fuel control units (FCUs) and installing an FCU that is eligible for installation. This AD was prompted by incidents of corrosion and perforation of the two-ply Cu-Be bellows in Woodward FCUs. We are issuing this AD to prevent failure of the Woodward FCU and engine, in-flight shutdown, and loss of control of the airplane.
(1) For P&WC PT6A-67AF and PT6A-67AG engines, within 500 flight hours (FHs) or one year after the effective date of this AD, whichever occurs first, replace the Woodward FCU. Use paragraphs 3.A. and 3.C. of P&WC S.B. No. PT6A-72-14389, Revision No. 4, dated February 3, 2016 to replace the FCU.
(2) For P&WC PT6A-60AG BS919 and BS1048 engines with pre-S.B. No. PT6A-72-13402 configurations, within 36 months after the effective date of this AD, replace the Woodward FCU. Use paragraph 3.C.(1) and 3.C.(3) of P&WC S.B. No. PT6A-72-13473, Revision No. 1, dated May 26, 2015 to replace the FCU.
(3) For P&WC PT6A-65AG BS708, BS903, BS1101, and BS1102 engines with pre-S.B. No. PT6A-72-13408 configurations, within 36 months after the effective date of this AD, replace the Woodward FCU. Use paragraphs 3.A.(1) and 3.A.(3) of P&WC S.B. No. PT6A-72-13473, Revision No. 1, dated May 26, 2015 to replace the FCU.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
