Source: https://www.federalregister.gov/documents/2006/07/11/E6-10772/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-formerly-rolls-royce-plc-dart-528-529
Timestamp: 2017-10-21 16:32:44
Document Index: 157898407

Matched Legal Cases: ['art 528', 'art 528', 'art 528', 'art 528', 'art 528', 'art 528']

Federal Register :: Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Formerly Rolls-Royce, plc.) Dart 528, 529, 532, 535, 542, and 555 Series Turbofan Engines
Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Formerly Rolls-Royce, plc.) Dart 528, 529, 532, 535, 542, and 555 Series Turbofan Engines
A Proposed Rule by the Federal Aviation Administration on 07/11/2006
We must receive any comments on this proposed AD by September 11, 2006.
39023-39025 (3 pages)
Docket No. FAA-2006-24825
Directorate Identifier 2006-NE-17-AD
Intermediate Pressure Turbine (IPT) Disk and HPT/IPT Disk Seal Arm Inspections
https://www.federalregister.gov/d/E6-10772 https://www.federalregister.gov/d/E6-10772
The FAA proposes to adopt a new airworthiness directive (AD) for Rolls-Royce Deutschland Ltd & Co KG (RRD) Dart 528, 529, 532, 535, 542, and 555 series turbofan engines. This proposed AD would require a dimensional inspection of the intermediate pressure turbine (IPT) disk or an ultrasonic inspection of the seal arm contact between the high pressure turbine (HPT) and the IPT disk seal arm and rework or replacement of the IPT disk if wear outside acceptable limits is found. This proposed AD results from reports of a number of HPT disk failures, some of which resulted in portions of the HPT disk being released. We are proposing this AD to prevent HPT disk failure, which can result in an uncontained engine failure and damage to the airplane.
Contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, D-15827 Dahlewitz, Germany; telephone 49 (0) 33-7086-1768; fax 49 (0) 33-7086-3356 for the service information identified in this proposed AD.
We invite you to submit any written relevant data, views, or arguments regarding this proposal. Send your comments to an address listed under ADDRESSES. Include “Docket No. FAA-2006-24825; Directorate Identifier 2006-NE-17-AD” in the subject line of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments.
The Luftfahrt-Bundesamt (LBA), which is the airworthiness authority for Germany, recently notified us that an unsafe condition may exist on RRD Dart 528, 529, 532, 535, 542, and 555 turbofan engines. The LBA advises that since 1972, there have been a number of HPT disk failures on in-service engines, three of which resulted in release of the HPT turbine disk. Fretting between the HPT disk and the IPT disk seal arms caused the release. We are proposing this AD to prevent HPT disk failure, which can result in an uncontained engine failure and damage to the airplane.
We have reviewed and approved the technical contents of RRD DART Service Bulletin (SB) Da72-536, Revision 1, dated August 25, 2003, and SB Da72-538, dated June 10, 2005. SB Da72-536 describes procedures for conducting an ultrasonic inspection to determine if a gap exists between the HPT and IPT disk seal arms. SB Da72-538 describes procedures for a dimensional inspection of the IPT disk and rework or replacement of the IPT disk if wear Start Printed Page 39024outside acceptable limits is found. The LBA classified this SB as mandatory and issued airworthiness directive D-2005-197, dated June 30, 2005, in order to ensure the airworthiness of these engines in Germany.
Because the service information was developed before the proposed AD, the compliance times permitted to conduct the inspections differ.
These engines, manufactured in the United Kingdom, are type-certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement. In keeping with this bilateral airworthiness agreement, the LBA kept us informed of the situation described above. We have examined the LBA's findings, reviewed all available information, and determined that AD action is necessary for products of this type design that are certificated for operation in the United States. We are proposing this AD, that would require a dimensional inspection of the IPT disk or an ultrasonic inspection of seal arm contact between the HPT and the IPT disk seal arm, and rework or replacement of the IPT disk, if wear outside acceptable limits is found. The proposed AD would require you to use the service information described previously to perform these actions.
We estimate that this proposed AD would affect 30 RRD Dart 528, 529, 532, 535, 542, and 555 series turbofan engines installed on airplanes of U.S. registry. We also estimate that it would take about 50 work-hours per engine to perform the proposed actions, and that the average labor rate is $80 per work-hour. Required parts would cost about $50,000 per IPT disk. We estimate that 25 percent, or eight engines, would require IPT disk replacement. Based on these figures, we estimate the total cost of the proposed AD to U.S. operators to be $500,000.
Rolls-Royce Deutschland Ltd & Co KG (formerly Rolls-Royce, PLc.): Docket No. FAA-2006-24825; Directorate Identifier 2006-NE-17-AD.
(a) The Federal Aviation Administration (FAA) must receive comments on this airworthiness directive (AD) action by September 11, 2006.
(c) This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) Dart 528, 529, 532, 535, 542, and 555 series turbofan engines. These engines are installed on, but not limited to, Hawker Siddeley, Argosy AW.650, Fairchild Hiller F-27, F-27A, F-27B, F-27F, F-27G, F-27J, FH-227, FH-227B, FH-227C, FH-227D, FH-227E, Fokker F.27 all marks; British Aircraft Corporation Viscount 744, 745D and 810; and Gulfstream G-159 airplanes.
(d) This AD results from reports of a number of high pressure turbine (HPT) disk failures, some of which resulted in portions of the HPT disk being released. We are issuing this AD to prevent HPT disk failure, which can result in an uncontained engine failure and damage to the airplane.
(f) Within 60 days after the effective date of the AD, do either of the following:
(1) Perform a dimensional inspection of the IPT disk and repair or replace the IPT disk, if necessary using paragraph 3 of the Accomplishment Instructions of RRD Service Bulletin (SB) Da72-538, dated June 10, 2005; Or
(2) Perform an ultrasonic inspection of the disk seal arm contact between the HPT and the IPT using paragraph 3 of the Accomplishment Instructions of RRD SB Da72-536, Revision 1, dated August 25, 2003.
(i) If wear is outside allowable limits, before December 31, 2006, perform a dimensional inspection and repair or replace the IPT disk, if necessary. Use paragraph 3 of the Accomplishment Instructions of RRD SB Da72-538, dated June 10, 2005.
(ii) If wear is within allowable limits, perform a dimensional inspection of the IPT disk at the next engine shop visit or at next overhaul, whichever occurs first and repair or replace the IPT disk, if necessary, Use paragraph 3 of the Accomplishment Instructions of RRD SB Da72-538, dated June 10, 2005.
(g) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19. Start Printed Page 39025
(h) LBA airworthiness directive D-2005-197, dated June 30, 2005, also addresses the subject of this AD.
Issued in Burlington, Massachusetts, on July 5, 2006.
[FR Doc. E6-10772 Filed 7-10-06; 8:45 am]