Airworthiness Directive · Amendment 39-17750 · Rolls-Royce Deutschland Ltd & Co. KG Turbofan Engines
Rolls-Royce Deutschland Ltd & Co. KG Turbofan Engines
This AD applies to Rolls-Royce Deutschland Ltd & Co. KG (RRD) Tay 620-15, 650-15, and 651-54 turbofan engines.
We are adopting a new airworthiness directive (AD) for all Rolls-Royce Deutschland Ltd & Co. KG (RRD) Tay 620-15, 650-15, and 651- 54 turbofan engines. This AD requires replacement of low-pressure compressor (LPC) fan blades. This AD was prompted by the discovery that the LPC fan blades leading edges erode in service and create an unacceptable blade flutter margin. We are issuing this AD to prevent LPC fan blade failure, damage to the engine, and damage to the airplane.
Unless already done, do the following actions:
(1) For Tay 620-15 engines, replace the complete set of LPC fan blades with a set eligible for installation as follows:
(i) If on the effective date of this AD, the LPC fan blades:
(A) Have less than 10,000 flight cycles since new (FCSN) or flight cycles since last repair (FCSLR), replace the blades before accumulating 12,000 FCSN or FCSLR.
(B) Have 10,000 or more FCSN or FCSLR, replace the blades within 2,000 flight cycles (FC).
(ii) Thereafter, replace the LPC fan blades within 12,000 FCSN or FCSLR.
(2) For Tay 650-15 and Tay 651-54 engines, replace the complete set of LPC fan blades with a set eligible for installation as follows:
(i) If on the effective date of this AD, the LPC fan blades:
(A) Have less than 8,000 FCSN or FCSLR, replace the blades before accumulating 10,000 FCSN or FCSLR.
(B) Have 8,000 or more FCSN or FCSLR, replace the fan blades within 2,000 FC.
(ii) Thereafter, replace the LPC fan blades within 10,000 FCSN or FCSLR.
(1) For the purpose of this AD, a repair is one that was performed in accordance with RRD Alert Non-Modification Service Bulletin (NMSB) No. Tay-72-A1782, Revision 2, dated May 30, 2013, or earlier versions of this Alert NMSB.
(2) LPC fan blades eligible for installation are:
(i) For Tay 620-15 engines, LPC fan blades with less than 12,000 FCSN or FCSLR; and
(ii) For Tay 650-15 and Tay 651-54 engines, LPC fan blades with less than 10,000 FCSN or FCSLR.
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.
Engines
