AD 2006-19-06 Airworthiness Directives; Pratt & Whitney Canada Turboprop Engines

Models named: PW118, PW118A, PW118B, PW119C, PW120, PW120A, PW121, PW121A, PW123, PW123B. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Pratt & Whitney Canada (P&WC) Models PW118, PW118A, PW118B, PW119C, PW120, PW120A, PW121, PW121A, PW123, PW123B, PW123C, PW123D, PW123E, PW124B, PW125B, PW127, and PW127E turboprop engines with certain propeller shafts installed. These engines are installed on, but not limited to, Aerospatiale ATR 42 and ATR 72 series, Bombardier DHC-8-100, -200, and -300 series, Dornier 328-120 series, Embraer EMB 120 series, and Fokker 50 airplanes.

You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Remove Propeller Shafts From Service (f) Before further flight, remove from service any propeller shaft that has a serial number (SN) listed in Table 1, Table 2, or Table 3 of P&WC Service Bulletin (SB) No. PW100-72-21714, Revision 2, dated May 20, 2005. (g) After the effective date of this AD, do not install any propeller shaft that has a SN listed in Table 1, Table 2, or Table 3 of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005. Visual Inspection (h) For all propeller shafts that have a SN listed in Table 4 of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005, do the following within two days after the effective date of this AD: (1) Perform a visual inspection for leaks. Use 3.A.(1) through 3.A.(2) of the Accomplishment Instructions of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005. (2) If you find a leak that you cannot fix without removing the propeller, perform an internal fluorescent penetrant inspection for cracks. Use 3.B.(1) through 3.B.(11)(h) of the Accomplishment Instructions of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005. (3) If you find a crack, replace the propeller shaft before further flight. Repetitive Visual Inspection (i) Thereafter, repeat the inspections of paragraphs (h)(1) through (h)(2) of this AD at not greater than 7 days between inspections. Internal Fluorescent Penetrant Inspection (j) For all propeller shafts that have a SN listed in Table 4 of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005, do the following within 250 hours time-in-service or 3 months, whichever is earlier, after the effective date of this AD: (1) Perform an internal fluorescent penetrant inspection for cracks on all propeller shafts that have a SN listed in Table 4 of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005. Use 3.B.(1) through 3.B.(11)(h) of the Accomplishment Instructions of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005. (2) If you find a crack, replace the propeller shaft before further flight. Terminating Actions (k) Replace any propeller shaft that has a SN listed in Table 4 of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005, by December 31, 2007. (l) Replacing a propeller shaft with a propeller shaft that doesn't have a SN listed in Table 4 of P&WC SB No. PW100-72-21714, Revision 2, dated May 20, 2005, terminates the repetitive inspection requirements in paragraph (i) of this AD. Alternative Methods of

This AD results from two reports of through-cracks in the propeller shaft. We are issuing this AD to detect through-cracks in the propeller shaft. Through-cracks at the No. 19 bearing area of the propeller shaft could result in uncontained engine failure and damage to the airplane.