Airworthiness directives › 2011-06-11
AD 2011-06-11 Airworthiness Directives; Rolls-Royce plc (RR) RB211-Trent 900 Series Turbofan Engines
Applicability*9
This AD applies to RR model RB211-Trent 970-84, 970B-84, 972-84, 972B-84, 977-84, 977B-84, and 980-84 turbofan engines. These engines are installed on, but not limited to, Airbus A380 series airplanes. Reason (d) An uncontained engine failure has recently occurred on a Rolls-Royce RB211 Trent 900 involving release of high energy debris and resulting in damage to the aeroplane. Analysis of the available elements from the incident investigation shows that an oil fire in the High Pressure/Intermediate Pressure (HP/IP) structure cavity may have initiated a sequence of events leading to rupture of the drive arm of the IP Turbine (IPT) disc and subsequent overspeed and burst of that same disc. Rolls-Royce has developed a modification of the Engine Electronic Controller (EEC) software, featuring an IPT Overspeed Protection System (IPTOS). The purpose of the IPTOS functionality is to detect engine conditions that may potentially lead to an IP turbine overspeed, and shut down the engine before the level of overspeed reaches the disc burst speed. We are issuing this AD to prevent overspeed of the intermediate pressure turbine, which could result in loss of disc integrity, an uncontained failure of the engine, and damage to the airplane.
Compliance
Unless already done, do the following actions: (1) Within 10 flight cycles after the effective date of this AD, incorporate software 10.6 to the EEC. (2) Guidance on incorporating software 10.6 can be found in Rolls-Royce plc Trent 900 Series Propulsion Systems Alert Service Bulletin (SB) No. RB.211-73-AG639, dated December 3, 2010. Prior Software Version Prohibition (3) After incorporation of software 10.6, do not incorporate any software version prior to 10.6 to the EEC. FAA AD Differences (f) This AD differs from the Mandatory Continuing Airworthiness Information (MCAI) as follows: (1) MCAI European Aviation Safety Agency (EASA) AD 2010-0262, dated December 13, 2010, requires that after EEC modification of an installed engine as required by that AD, do not intermix with any EEC software standards prior to modification 73-F328 (standard 9.2.1) on that airplane. This AD does not, because there are no U.S. registered airplanes with RB211-Trent 900 engines. (2) MCAI EASA AD 2010-0262, dated December 13, 2010, states that from the effective date of the AD, no engine may be installed in an airplane unless the engine has incorporated the new software. This AD does not, because there are no U.S. registered airplanes with RB211-Trent 900 engines. (3) MCAI EASA AD 2010-0262, dated December 13, 2010, allows incorporation of later approved versions of EEC software standards that will include IPTOS functionality. This AD does not. Instead, we prohibit software installation prior to version 10.6. Alternative Methods of Compliance (AMOCs) (g) The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (h) Refer to MCAI EASA AD 2010-0262, dated December 13, 2010, and Rolls-Royce plc Trent 900 Series Propulsion Systems Alert SB No. RB.211-73-AG639, dated December 3, 2010, for related information. (i) Contact Rolls-Royce plc, P.O. Box 31, Derby, DE24 8BJ, United Kingdom; phone: 44 1332 242424; fax: 44 1332 249936, for a copy of the service information referenced in this AD. (j) Contact Alan Strom, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: alan.strom@faa.gov; phone: (781) 238-7143; fax: (781) 238-7199, for more information about this AD. Material Incorporated by Reference (k) None. Issued in Burlington, Massachusetts, on March 11, 2011. Peter A. White, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 2011-6154 Filed 3-17-11; 8:45 am] BILLING CODE 4910-13-P
Required actions
Unless already done, do the following actions: (1) Within 10 flight cycles after the effective date of this AD, incorporate software 10.6 to the EEC. (2) Guidance on incorporating software 10.6 can be found in Rolls-Royce plc Trent 900 Series Propulsion Systems Alert Service Bulletin (SB) No. RB.211-73-AG639, dated December 3, 2010. Prior Software Version Prohibition (3) After incorporation of software 10.6, do not incorporate any software version prior to 10.6 to the EEC. FAA AD Differences (f) This AD differs from the Mandatory Continuing Airworthiness Information (MCAI) as follows: (1) MCAI European Aviation Safety Agency (EASA) AD 2010-0262, dated December 13, 2010, requires that after EEC modification of an installed engine as required by that AD, do not intermix with any EEC software standards prior to modification 73-F328 (standard 9.2.1) on that airplane. This AD does not, because there are no U.S. registered airplanes with RB211-Trent 900 engines. (2) MCAI EASA AD 2010-0262, dated December 13, 2010, states that from the effective date of the AD, no engine may be installed in an airplane unless the engine has incorporated the new software. This AD does not, because there are no U.S. registered airplanes with RB211-Trent 900 engines. (3) MCAI EASA AD 2010-0262, dated December 13, 2010, allows incorporation of later approved versions of EEC software standards that will include IPTOS functionality. This AD does not. Instead, we prohibit software installation prior to version 10.6. Alternative Methods of Compliance (AMOCs) (g) The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (h) Refer to MCAI EASA AD 2010-0262, dated December 13, 2010, and Rolls-Royce plc Trent 900 Series Propulsion Systems Alert SB No. RB.211-73-AG639, dated December 3, 2010, for related information. (i) Contact Rolls-Royce plc, P.O. Box 31, Derby, DE24 8BJ, United Kingdom; phone: 44 1332 242424; fax: 44 1332 249936, for a copy of the service information referenced in this AD. (j) Contact Alan Strom, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: alan.strom@faa.gov; phone: (781) 238-7143; fax: (781) 238-7199, for more information about this AD. Material Incorporated by Reference (k) None. Issued in Burlington, Massachusetts, on March 11, 2011. Peter A. White, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 2011-6154 Filed 3-17-11; 8:45 am] BILLING CODE 4910-13-P
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