Airworthiness Directive · Amendment 39-19049 · Turbine engine compressor section
Rolls-Royce plc Turbofan Engines
This AD applies to Rolls-Royce plc (RR) Trent XWB-75, Trent XWB-79, Trent XWB-79B, and Trent XWB-84 turbofan engines with an engine serial number (ESN) listed in Appendix 1 of RR Alert Non Modification Service Bulletin (NMSB) Trent XWB 72-AJ443, Revision 1, dated December 21, 2016.
We are adopting a new airworthiness directive (AD) for certain Rolls-Royce plc (RR) Trent XWB-75, Trent XWB-79, Trent XWB-79B, and Trent XWB-84, turbofan engines. This AD requires replacement of the low-pressure compressor (LPC) case support inboard pins. This AD was prompted by LPC case support inboard pins that may have reduced integrity due to incorrect heat treatment. We are issuing this AD to correct the unsafe condition on these products.
(1) Before exceeding 1,500 flight cycles since new, or within 4 months after the effective date of this AD, whichever occurs later, inspect each LPC case support inboard pin to identify the serial number (S/N) using Section 3, the Accomplishment Instructions, of RR Alert NMSB Trent XWB 72-AJ443, Revision 1, dated December 21, 2016.
(i) If a pin having a S/N that begins with 235338 is installed, replace the LPC case support inboard pin, and outboard hollow dowels, nuts and bolts using Section 3, the Accomplishment Instructions of RR Alert NMSB Trent XWB 72-AJ443, Revision 1, dated December 21, 2016.
(ii) If a pin having a S/N that begins with 237746 or 204520 is installed, replace the LPC case support outboard hollow dowel, nuts and bolts, using Section 3, the Accomplishment Instructions of RR Alert NMSB Trent XWB 72-AJ443, Revision 1, dated December 21, 2016.
After the effective date of this AD, do not install an engine affected by this AD, unless it has been inspected in accordance with the Accomplishment Instructions of RR Alert NMSB Trent XWB 72-AJ443, Revision 1, dated December 21, 2016.
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.
