Airworthiness Directive · Amendment 39-17078 · Pratt & Whitney Canada Turboprop Engines
Pratt & Whitney Canada Turboprop Engines
Superseded. A later AD replaced this one: AD 2012-26-08. Comply with the one in force.
This AD applies to all Pratt & Whitney Canada (P&WC) PW118, PW118A, PW118B, PW119B, PW119C, PW120, PW120A, PW121, PW121A, PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, PW127G, and PW127M turboprop engines, with the serial number (S/N) propeller shafts listed in P&WC Alert Service Bulletin (ASB) No. PW100-72-A21813, Revision 3, dated March 21, 2012, and ASB No. PW100-72-A21802, Revision 4, dated March 16, 2012.
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada (P&WC) PW118, PW118A, PW118B, PW119B, PW119C, PW120, PW120A, PW121, PW121A, PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, PW127G, and PW127M turboprop engines. This AD requires initial and repetitive inspections of certain serial numbers (S/Ns) of propeller shafts for cracks and removal from service if found cracked. This AD was prompted by reports of two propeller shafts found cracked at time of inspection during maintenance. We are issuing this AD to detect propeller shaft cracks, which could cause failure of the shaft, propeller release, and loss of control of the airplane.
Unless already done, do the following actions.
(1) Within 30 days after the effective date of this AD, remove from service propeller shafts with an S/N listed in Table 1 of P&WC ASB No. PW100-72-A21802, Revision 4, dated March 16, 2012.
(2) For propeller shafts with a S/N listed in Table 1 or Table 2 of P&WC ASB No. PW100-72-A21813, Revision 3, dated March 21, 2012:
(i) Within 200 engine flight hours (EFH) or 40 days, whichever occurs first after the effective date of this AD, perform either an initial visual inspection or an initial ultrasonic inspection (UI) for cracks, in accordance with paragraphs 3.C.(1) through 3.C.(1)(a), and 3.C.(2) of P&WC ASB No. PW100-72-A21813, Revision 3, dated March 21, 2012, and Section 9 of P&WC Special Instruction (SI) P&WC 22-2012R2, dated April 4, 2012.
(ii) If the visual inspection was performed, repeat the visual inspection within 50 EFH after the initial inspection, and thereafter every 10 EFH, until the propeller shaft is removed from service.
(iii) If the UI was performed, repeat the UI at intervals not to exceed 1,000 EFH, until the propeller shaft is removed from service.
(3) If a crack is found during any of the inspections required by this AD, remove the propeller shaft from service before the next flight.
After the effective date of this AD, do not install any propeller shaft S/Ns listed in Table 1 of P&WC ASB No. PW100-72-A21802, Revision 4, dated March 16, 2012, into any engine.
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.
