Airworthiness directives › 2017-19-19
AD 2017-19-19 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(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.
Unsafe condition
This AD was prompted by low-pressure compressor (LPC) case support inboard pins that may have reduced integrity due to incorrect heat treatment. We are issuing this AD to prevent failure of the LPC case support inboard pins, loss of core to fan case concentricity, LPC blade rubs and possible blade release, or an engine under cowl fire.
Affected ADs
None.
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