AD 2006-11-05R2

AD Final Rules - 2006-11-05R2.pdf
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AD Number:
2006-11-05R2
Document Type:
AD Final Rules
Docket Number:
FAA-2007-27824
Subject Heading:
Airworthiness Directives; Rolls-Royce plc RB211 Series Turbofan Engines
Subject:
High pressure compressor (HPC)
Status:
Current
Citation:
Federal Register: February 6, 2008 (Volume 73, Number 25)
Citation Publish Date:
02/06/2008
Effective Date:
02/21/2008
Make:
Rolls-Royce plc
Model:
RB211-22B-02 | RB211-22B/MOD 72-8700 | RB211-524B-02 | RB211-524B-B-02 | RB211-524B2-19 | RB211-524B...Show more
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
2006-11-05R1
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
Updated RGL applicability to match AD applicability; CAR C-11-185
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[Federal Register: February 6, 2008 (Volume 73, Number 25)]


[Rules and Regulations]


[Page 6838-6840]


From the Federal Register Online via GPO Access [wais.access.gpo.gov]


[DOCID:fr06fe08-3]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2007-27824; Directorate Identifier 2003-NE-12-AD; Amendment 39-15364;


AD 2006-11-05R2]


RIN 2120-AA64


Airworthiness Directives; Rolls-Royce plc RB211 Series Turbofan Engines


AGENCY:
 
Federal Aviation Administration (FAA), Department of Transportation (DOT).


ACTION:
 
Final rule; request for comments.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
The FAA is revising an existing airworthiness directive (AD) for Rolls-Royce plc


(RR) RB211-22B series, RB211-524B, -524C2, -524D4, -524G2, -524G3, and -524H series, and


RB211-535C and -535E series turbofan engines with high pressure compressor (HPC) stage 3 disc


assemblies, part numbers (P/Ns) LK46210, LK58278, LK67634, LK76036, UL11706, UL15358,


UL22577, UL22578, and UL24738 installed. That AD currently requires removing from service


certain disc assemblies before they reach their full published life if not modified with anticorrosion


protection. This AD requires the same actions but relaxes the removal


compliance time for certain disc assemblies that have a record of detailed inspection. This AD results


from the FAA allowing certain affected disc assemblies that have a record of a detailed inspection, to


remain in service for a longer period than the previous AD allowed. We are issuing this AD to relax


the compliance time for disc assemblies manufactured both ''before and after 1990'' by providing an


option to track the disc life based on a record of a detailed inspection rather than by its entry into


service date, while continuing to prevent corrosion-induced uncontained disc assembly failure,


resulting in damage to the airplane.


DATES:
 
Effective February 21, 2008. The Director of the Federal Register previously approved the


incorporation by reference of certain publications listed in the regulations as of February 24, 2004 (69


FR 2661, January 20, 2004).


We must receive any comments on this AD by April 7, 2008.


ADDRESSES:
 
Use one of the following addresses to comment on this AD.


•
 
Federal eRulemaking Portal: Go to http://www.regulations.gov and follow the instructions for


sending your comments electronically.
2


•
 
Mail: U.S. Docket Management Facility, Department of Transportation, 1200 New Jersey Avenue


SE., West Building Ground Floor, Room W12-140, Washington, DC 20590-0001.


•
 
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through


Friday, except Federal holidays.


•
 
Fax: (202) 493-2251.


Contact Rolls-Royce plc, PO Box 31, Derby, England, DE248BJ; telephone: 011-44-1332-


242424; fax: 011-44-1332-245-418, for the service information identified in this AD.


FOR FURTHER INFORMATION CONTACT:
 
Ian Dargin, Aerospace Engineer, Engine


Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park;


Burlington, MA 01803; e-mail: ian.dargin@faa.gov; telephone (781) 238-7178; fax (781) 238-7199.


SUPPLEMENTARY INFORMATION:
 
On May 15, 2006, the FAA issued AD 2006-11-05,


Amendment 39-14609 (71 FR 29586, May 23, 2006). We also issued a correction to that AD on


September 26, 2006 (71 FR 58254, October 3, 2006) and a revision to that AD on April 9, 2007 (72


FR 18862, April 16, 2007). That AD revision requires removing from service certain disc assemblies


before they reach their full published life if not modified with anticorrosion protection. That AD was


the result of the manufacturer's reassessment of the corrosion risk on HPC stage 3 disc assemblies


that have not yet been modified with sufficient application of anticorrosion protection. That


condition, if not corrected, could result in corrosion-induced uncontained disc assembly failure,


resulting in damage to the airplane.


Actions Since AD 2006-11-05R1 Was Issued


Since AD 2006-11-05R1 was issued, we discovered that the population of affected disc


assemblies identified in that AD was incorrect. That AD allowed affected disc assemblies that entered


into service ''before 1990'' that have a record of a detailed inspection, to remain in service for a longer


period than the previous AD, AD 2006-11-05, allowed. This revised AD allows disc assemblies


manufactured both ''before and after 1990'' that have a record of a detailed inspection, to remain in


service for 17 years from last overhaul inspection date. But the discs are not to exceed the


manufacturer's published cyclic limit in the time limits section of the manual. We are issuing this AD


to relax the compliance time for certain disc assemblies by providing an option to track the disk life


based on a record of a detailed inspection rather than by its entry into service date, while continuing


to prevent corrosion-induced uncontained disc assembly failure, resulting in damage to the airplane.


Relevant Service Information


We have reviewed and approved the technical contents of RR MSB No. RB.211-72-9661,


Revision 5, dated December 22, 2006. That MSB allows affected disc assemblies and that have a


record of detailed inspection:


•
 
To remain in service for 17 years from last overhaul inspection date; but


•
 
Not to exceed the manufacturer's published cyclic limit in the time limits section of the manual.


We do not incorporate by reference this MSB, but we list it in the Related Information section.


Bilateral Airworthiness Agreement


This engine model is manufactured in the United Kingdom (UK), and is 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. Under this bilateral


airworthiness agreement, the Civil Aviation Authority (CAA), which is the airworthiness authority