[Federal Register: February 9, 2006 (Volume 71, Number 27)]
[Rules and Regulations]
[Page 6673-6675]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr09fe06-6]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2005-23279; Directorate Identifier 2005-NE-44-AD;
Amendment 39-14478; AD 2006-03-14]
RIN 2120-AA64
Airworthiness Directives; Rolls-Royce plc RB211 Trent 500 Series
Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule; request for comments.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
Rolls Royce plc (RR) RB211 Trent 500 series turbofan engines. This AD
requires initial and repetitive borescope inspections of the high
pressure-and-intermediate pressure (HP-IP) turbine oil vent tubes and
bearing chambers for coking and carbon buildup and replacing the vent
tubes if necessary. This AD results from a report of an RB211 Trent 700
series engine that experienced a disk shaft separation, overspeed of
the IP turbine rotor, and multiple blade release of IP turbine blades.
Since the design arrangement in the Trent 500 series engines is similar
to that of the Trent 700 series engines, the same failure could occur
in the Trent 500 series engines. We are issuing this AD to prevent
internal oil fires caused by coking and carbon buildup, that could
result in uncontained engine failure and damage to the airplane.
DATES: Effective February 24, 2006. The Director of the Federal
Register approved the incorporation by reference of certain
publications listed in the regulations as of February 24, 2006.
We must receive any comments on this AD by April 10, 2006.
ADDRESSES: Use one of the following addresses to comment on this AD:
DOT Docket Web site: Go to http://dms.dot.gov and follow
the instructions for sending your comments electronically.
Government-wide rulemaking Web site: Go to http://www.regulations.gov
and follow the instructions for sending your
comments electronically.
Mail: Docket Management Facility; U.S. Department of
Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-401,
Washington, DC 20590-0001.
Fax: (202) 493-2251.
Hand Delivery: Room PL-401 on the plaza level of the
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
Contact Rolls-Royce plc, Technical Publications, P.O. Box 31,
Derby, DE24 8BJ, UK; telephone: 011-44-1332-242424; fax: 011-44-1332-
249936, for the service information identified in this AD.
FOR FURTHER INFORMATION CONTACT: Christopher Spinney, Aerospace
Engineer, Engine Certification Office, FAA, Engine and Propeller
Directorate, 12 New England Executive Park, Burlington, MA 01803-5299;
telephone (781) 238-7175; fax (781) 238-7199.
SUPPLEMENTARY INFORMATION: The Civil Aviation Authority (CAA), which is
the airworthiness authority for the United Kingdom (UK) recently
notified us that an unsafe condition might exist on RR RB211 Trent 500
Series turbofan engines. The CAA advises that a previous service
incident in a Trent 700 engine indicates that carbon restriction in the
vent tube can cause over-pressurization of the HP-IP bearing chamber
leading to oil ejection from the rear of the chamber. If this oil spray
ignites, the fire can cause an IPT shaft failure, leading to overspeed
and uncontained failure of the IPT disc. Since the design arrangement
in the Trent 500 engines is similar to that of the Trent 700 engines,
the same failure could occur in the Trent 500 series engines. We are
issuing this AD to prevent internal oil fires caused by coking and
carbon buildup, that could result in uncontained engine failure and
damage to the airplane.
Relevant Service Information
We have reviewed and approved the technical contents of RR Alert
Service Bulletin (ASB) RB.211-72-AE836, Revision 1, dated October 5,
2005. That ASB describes procedures for initial and repetitive
borescope inspection and assessment of the HP-IP turbine oil vent tubes
and bearing chamber. The CAA classified this service bulletin as
mandatory and issued AD No. G-2005-0029, dated October 4, 2005, in
order to ensure the airworthiness of these RR Trent 500 series engines
in the U.K.
Bilateral Airworthiness Agreement
These RB211 Trent 500 series turbofan engines are manufactured in
the U.K. and 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. Under this bilateral airworthiness agreement, the CAA kept
the FAA informed of the situation described above. We have examined the
findings of the CAA, 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.
FAA's Determination and Requirements of This AD
Although no airplanes that are registered in the United States use
these engines, the possibility exists that the engines could be used on
airplanes that are registered in the United States in the future. The
unsafe condition described previously is likely to exist or develop on
other RR RB211 Trent 500 series turbofan engines of the same type
design. This AD requires initial and repetitive borescope inspections
of the HP-IP turbine bearing oil vent tubes and bearing chambers for
coking and carbon buildup; and replacement of the tubes if necessary.
We are issuing this AD to prevent internal oil fires from coking
and carbon buildup that could cause uncontained engine failure and
damage to the
[[Page 6674]]
airplane. You must use the service information described previously to
perform the actions required by this AD.
FAA's Determination of the Effective Date
Since there are currently no domestic operators of this engine
model, notice and opportunity for public comment before issuing this AD
are unnecessary. A situation exists that allows the immediate adoption
of this regulation.
Comments Invited
This AD is a final rule that involves requirements affecting flight
safety and was not preceded by notice and an opportunity for public
comment; however, we invite you to send us any written relevant data,
views, or arguments regarding this AD. Send your comments to an address
listed under ADDRESSES. Include ``AD Docket No. FAA-2005-23279;
Directorate Identifier 2005-NE-44-AD'' in the subject line of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify it.
We will post all comments we receive, without change, to http://dms.dot.gov
, including any personal information you provide. We will
also post a report summarizing each substantive verbal contact with FAA
personnel concerning this AD. Using the search function of the DMS Web
site, anyone can find and read the comments in any of our dockets,
including the name of the individual who sent the comment (or signed
the comment on behalf of an association, business, labor union, etc.).
You may review the DOT's complete Privacy Act Statement in the Federal
Register published on April 11, 2000 (65 FR 19477-78) or you may visit
http://dms.dot.gov.
Examining the AD Docket
You may examine the docket that contains the AD, any comments
received, and any final disposition in person at the Docket Management
Facility Docket Office between 9 a.m. and 5 p.m., Monday through
Friday, except Federal holidays. The Docket Office (telephone (800)
647-5227) is located on the plaza level of the Department of
Transportation Nassif Building at the street address stated in
ADDRESSES. Comments will be available in the AD docket shortly after
the DMS receives them.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII, Aviation Programs,
describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in
subtitle VII, part A, subpart III, section 44701, ``General
requirements.'' Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this
rulemaking action.
Regulatory Findings
We have determined that this AD will not have federalism
implications under Executive Order 13132. This AD will not have a
substantial direct effect on the States, on the relationship between
the National Government and the States, or on the distribution of power
and responsibilities among the various levels of government.
For the reasons discussed above, I certify that the regulation:
1. Is not a ``significant regulatory action'' under Executive Order
12866;
2. Is not a ``significant rule'' under the DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979); and
3. Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
We prepared a summary of the costs to comply with this AD and
placed it in the AD Docket. You may get a copy of this summary by
sending a request to us at the address listed under ADDRESSES. Include
``AD Docket No. FAA-2005-23279; Directorate Identifier 2005-NE-44-AD''
in your request.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
0
Under the authority delegated to me by the Administrator, the Federal
Aviation Administration amends part 39 of the Federal Aviation
Regulations (14 CFR part 39) as follows:
PART 39--AIRWORTHINESS DIRECTIVES
0
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2006-03-14 Rolls-Royce plc: Amendment 39-14478. Docket No. FAA-2005-
23279; Directorate Identifier 2005-NE-44-AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective February
24, 2006.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Rolls-Royce plc (RR) RB211 Trent 553-61,
553A2-61, 556B-61, 556A2-61, 556-61, 556B2-61, 560-61, and 560A2-61
turbofan engines. These engines are installed on, but not limited
to, Airbus A340-500 and A340-600 series airplanes.
Unsafe Condition
(d) This AD results from a report of an RB211 Trent 700 series
engine that experienced a disk shaft separation, overspeed of the IP
turbine rotor, and multiple blade release of IP turbine blades. We
are issuing this AD to prevent internal oil fires caused by coking
and carbon buildup, that could result in uncontained engine failure
and damage to the airplane.
Compliance
(e) You are responsible for having the actions required by this
AD performed within the compliance times specified unless the
actions have already been done.
Initial Inspection
(f) Using section 3, Parts A and B of the Accomplishment
Instructions of RR Alert Service Bulletin (ASB) RB.211-72-AE836,
Revision 1, dated October 5, 2005, perform an initial inspection of
the high pressure-and-intermediate-pressure (HP-IP) turbine bearing
oil vent tubes and bearing chambers as follows:
(1) For IP Turbine modules (05 modules) with 9,600 hours time-
since-new (TSN) or 1,200 cycles-since-new (CSN) or more on the
effective date of this AD, carry out the inspection within 2,400
hours time-in-service (TIS) or 300 cycles-in-service (CIS) from the
effective date of this AD, whichever occurs first.
(2) For 05 modules that are below 9,600 hours TSN or 1,200 CSN
on the effective date of this AD, carry out the inspection prior to
12,000 hours TSN or 1,500 CSN, whichever occurs first,.
Repetitive Inspections
(g) Repeat the inspection at intervals not to exceed 12,000
hours time-since-previous-inspection (TSPI) or 1,500 cycles-since-
previous-inspection (CSPI), whichever occurs first, if at the
previous inspection, any of the following conditions were observed:
(1) There was no carbon buildup of a visible thickness.
(2) The cleaning tool, HU82105, could pass along the full length
of the internal vent tube into the bearing chamber.
[[Page 6675]]
(3) The 8 mm diameter borescope could pass along the full length
of the internal vent tube into the bearing chamber.
(h) Repeat the inspection at intervals not to exceed 1,600 hours
TSPI or 400 CSPI, whichever occurs first, if, at the previous
inspection, the carbon restriction prevented the 8 mm diameter
flexible borescope from passing through the internal vent tube, but
the 6 mm diameter borescope could pass along the full length of the
internal vent tube into the bearing chamber.
(i) Remove the engine within 10 CSPI, if the carbon restriction
prevented the 6 mm diameter borescope from passing through the full
length of the internal vent tubes.
05 Modules in the Shop
(j) For 05 modules in the shop on the effective date of this AD,
inspect the vent tube for carbon buildup of a visible thickness and
repair the vent tube as necessary prior to further flight.
Information regarding the inspection and repair of vent tubes for 05
modules in the shop can be found in section B. of RR ASB RB.211-72-
AE836, Revision 1, dated October 5, 2005.
Alternative Methods of Compliance
(k) 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.
Related Information
(l) United Kingdom Civil Aviation Authority airworthiness
directive G-2005-0029, dated October 4, 2005, also addresses the
subject of this AD.
Material Incorporated by Reference
(m) You must use Rolls-Royce plc Alert Service Bulletin RB.211-
72-AE836, Revision 1, dated October 5, 2005, to perform the
inspections required by this AD. The Director of the Federal
Register approved the incorporation by reference of this service
bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51.
Contact Rolls-Royce plc, Technical Publications, P.O. Box 31, Derby,
DE24 8BJ, UK; telephone: 011-44-1332-242424; fax: 011-44-1332-
249936, for a copy of this service information. You may review
copies at the Docket Management Facility; U.S. Department of
Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-
401, Washington, DC 20590-0001, on the internet at http://dms.dot.gov
; or at the National Archives and Records Administration
(NARA). For information on the availability of this material at
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibrlocations.html
.
Issued in Burlington, Massachusetts, on February 1, 2006.
Peter A. White,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 06-1145 Filed 2-8-06; 8:45 am]
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