Airworthiness directives › 2012-24-05
AD 2012-24-05 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) RB211-Trent 970-84 and 972-84 series turbofan engines, all serial numbers.
Compliance
After the effective date of this AD: (1) Do not approve for return to service any airplane with an engine, affected by this AD, installed, unless the engine has passed the inspection required by paragraph (e)(2) of this AD. (2) Do not install an LPT bearing housing end cover assembly, P/N FW22780, onto any engine required to be inspected by this AD, unless the LPT bearing housing end cover assembly was inspected as required by this AD.
Required actions
If you accomplished the actions required by paragraph (e) of this AD before the effective date of this AD using RR Technical Variance (TV) 125436, issue 2, dated July 27, 2012, you met the requirements of paragraph (e) of this AD.
Unsafe condition
Before further flight, unless already done, do the following: (1) Use paragraph 1.A. of RR Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AH051, dated August 3, 2012, or Revision 1, dated September 11, 2012, and RR NMSB RB.211-72-H056, dated August 3, 2012, or Revision 1, dated September 11, 2012, to determine which engine serial numbers to inspect. (2) Inspect the LPT bearing housing end cover assembly for the presence of a spherical seat, P/N CU38971. For guidance on performing the inspection, see paragraphs 3.A.(5) through 3.A.(8) of the SBs listed in paragraph (e)(1) of this AD. (3) If, during the inspection required by paragraph (e)(2) of this AD, you find that spherical seat, P/N CU38971, is missing, replace the LPT bearing housing end cover assembly, P/N FW22780, with a part eligible for installation.
Affected ADs
None.
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