Airworthiness Directives; Rolls-Royce plc (RR) Models Trent 768-60, 772-60, 772B-60, and 772C-60 Turbofan Engines, 31019-31021 [E8-12061]

Download as PDF Federal Register / Vol. 73, No. 105 / Friday, May 30, 2008 / Rules and Regulations Removing IPC drums, P/N FK30102, With Certain Serial Numbers (SNs) DEPARTMENT OF TRANSPORTATION (f) For engines with an IPC drum, P/N FK30102, that has an SN specified in Table 1 of this AD, remove the IPC within 2,910 cycles-since-new (CSN) or the next overhaul after the effective date of this AD, whichever occurs first. Federal Aviation Administration MW0131219 MW0164840 MW0171399 MW0156891 MW0168864 KHI00012 (g) For engines with an IPC drum, P/N FK30102, that doesn’t have an SN specified in Table 1 of this AD, remove the IPC drum within 5,830 CSN. Prohibited Installation of IPC Drums, P/N FK30102 (h) After the effective date of this AD, do not install the following: (1) IPC drums, P/N FK30102, that have an SN specified in Table 1 of this AD, and have accumulated or exceeded 2,910 CSN. (2) IPC drums, P/N FK30102, that don’t have an SN specified in Table 1 of this AD, and have accumulated or exceeded 5,830 CSN. Alternative Methods of Compliance (i) 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. Material Incorporated by Reference (j) None. Related Information ebenthall on PRODPC60 with RULES (k) EASA airworthiness directive 2008– 0042, dated February 27, 2008, and RR Alert Service Bulletins RB.211–72–AF258, Revision 1, dated March 29, 2007; and RB.211–72–AF431, dated January 14, 2008, also address the subject of this AD. (l) Contact James Lawrence, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: james.lawrence@faa.gov; telephone (781) 238–7176; fax (781) 238– 7199, for more information about this AD. Issued in Burlington, Massachusetts, on May 21, 2008. Robert G. Mann, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E8–11946 Filed 5–29–08; 8:45 am] VerDate Aug<31>2005 13:51 May 29, 2008 Jkt 214001 Examining the AD Docket Airworthiness Directives; Rolls-Royce plc (RR) Models Trent 768–60, 772–60, 772B–60, and 772C–60 Turbofan Engines You may examine the AD docket on the Internet at https:// www.regulations.gov; or in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Operations office (telephone (800) 647–5527) is the same as the Mail address provided in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. 14 CFR Part 39 Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule; request for comments. AGENCY: Removing All Other IPC Drums, P/N FK30102 BILLING CODE 4910–13–P [Docket No. FAA–2008–0597; Directorate Identifier 2008–NE–12–AD; Amendment 39– 15542; AD 2008–11–19] 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. RIN 2120–AA64 TABLE 1.—IPC DRUMS BY SN MW0134967 MW0158192 MW0168190 31019 SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Three Trent 700 IP Turbine discs that exhibited signs of wear at the bore following failure of the bearing chamber sealing sleeve were returned to service. This was based on the fact that Non-Destructive Testing (NDT) did not reveal micro cracking on the affected disc areas. Further engineering investigation considered that, although no micro cracking had been found, the worn disc bore surfaces would have an associated fatigue penalty compared to an unaffected bore. A crack developing from these rubbed surfaces could potentially lead to a disc burst. As the described wear, present at the bores of those three discs, presents a potential unsafe condition, this Airworthiness Directive requires identification of the three affected serial numbers of IP Turbine Discs (P/N FK20795) and removal from service prior to attaining a certain number of cycles, as indicated. We are issuing this AD to prevent a failure of the intermediate pressure (IP) turbine disc that could result in an uncontained failure of the engine and possible damage to the airplane. DATES: This AD becomes effective June 16, 2008. We must receive comments on this AD by June 30, 2008. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to https://www.regulations.gov and follow the instructions for sending your comments electronically. • Mail: U.S. Department of Transportation, 1200 New Jersey PO 00000 Frm 00005 Fmt 4700 Sfmt 4700 FOR FURTHER INFORMATION CONTACT: James Lawrence, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: james.lawrence@faa.gov; telephone (781) 238–7176; fax (781) 238–7199. SUPPLEMENTARY INFORMATION: Discussion The European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community, has issued EASA Airworthiness Directive 2007–0267–E, dated October 8, 2007 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: Three Trent 700 IP Turbine discs that exhibited signs of wear at the bore following failure of the bearing chamber sealing sleeve were returned to service. This was based on the fact that Non-Destructive Testing (NDT) did not reveal micro cracking on the affected disc areas. Further engineering investigation considered that, although no micro cracking had been found, the worn disc bore surfaces would have an associated fatigue penalty compared to an unaffected bore. A crack developing from these rubbed surfaces could potentially lead to a disc burst. As the described wear, present at the bores of those three discs, presents a potential unsafe condition, this Airworthiness Directive requires identification of the three affected serial numbers of IP Turbine Discs (P/N FK20795) and removal from service prior to attaining a certain number of cycles, as indicated. You may obtain further information by examining the MCAI in the AD docket. E:\FR\FM\30MYR1.SGM 30MYR1 31020 Federal Register / Vol. 73, No. 105 / Friday, May 30, 2008 / Rules and Regulations Relevant Service Information Rolls-Royce has issued Alert Service Bulletin RB.211–72–AF734, dated October 3, 2007. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. FAA’s Determination and Requirements of This AD This product has been approved by the aviation authority of the United Kingdom, and is approved for operation in the United States. Pursuant to our bilateral agreement with the United Kingdom, they have notified us of the unsafe condition described in the EASA AD and service information referenced above. We are proposing this AD because we evaluated all information provided by EASA and determined the unsafe condition exists and is likely to exist or develop on other products of the same type design. 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. ebenthall on PRODPC60 with RULES Comments Invited This AD is a final rule that involves requirements affecting flight safety, and we did not precede it by notice and opportunity for public comment. We invite you to send any written relevant data, views, or arguments about this AD. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2008–0597; Directorate Identifier 2008–NE–12–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this AD. We will consider all comments received by the closing date and may amend this AD because of those comments. We will post all comments we receive, without change, to https:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this AD. Using the search function of the Web site, anyone can find and read the comments in any of our dockets, including, if provided, 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 VerDate Aug<31>2005 13:51 May 29, 2008 Jkt 214001 Federal Register published on April 11, 2000 (65 FR 19477–78). 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 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 this AD: 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 regulatory evaluation of the estimated costs to comply with this AD and placed it in the AD docket. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 2008–11–19 Rolls-Royce plc: Amendment 39–15542; Docket No. FAA–2008–0597; Directorate Identifier 2008–NE–12–AD. Effective Date (a) This airworthiness directive (AD) becomes effective June 16, 2008. Affected ADs (b) None. Applicability (c) This AD applies to Rolls-Royce plc models Trent 768–60, 772–60, 772B–60, 772C–60 turbofan engines with intermediate pressure (IP) turbine discs, part number (P/N) FK20795, that have a serial number specified in Table 1 of this AD, installed. These engines are installed on, but not limited to, Airbus 330 series airplanes. Reason (d) Three Trent 700 IP Turbine discs that exhibited signs of wear at the bore following failure of the bearing chamber sealing sleeve were returned to service. This was based on the fact that Non-Destructive testing (NDT) did not reveal micro cracking on the affected disc areas. Further engineering investigation considered that, although no micro cracking had been found, the worn disc bore surfaces would have an associated fatigue penalty compared to an unaffected bore. A crack developing from these rubbed surfaces could potentially lead to a disc burst. As the described wear, present at the bores of those three discs, presents a potentially unsafe condition, this Airworthiness Directive requires identification of the three affected serial numbers of IP Turbine Discs (P/N FK20795) and removal from service prior to attaining a certain number of cycles, as indicated. We are issuing this AD to prevent a failure of the IP turbine disc that could result in an uncontained failure of the engine and possible damage to the airplane. Actions and Compliance (e) Unless already done, do the following actions. (1) The affected IP Turbine Discs, P/N FK20795, must be removed from service prior to attaining the following number of Cycles Since New (CSN): TABLE 1.—IP TURBINE DISCS BY ENGINE SERIAL NUMBER AND DISC SERIAL NUMBER I PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: I PO 00000 Frm 00006 Fmt 4700 Sfmt 4700 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: I Serial No. CREB452 .............................. CREB216 .............................. CREB322 .............................. Removal limit in CSN 7,960 7,930 7,500 (2) For detailed instructions, refer to RollsRoyce RB211 Propulsion System NonModification Service Bulletin RB211–72– E:\FR\FM\30MYR1.SGM 30MYR1 Federal Register / Vol. 73, No. 105 / Friday, May 30, 2008 / Rules and Regulations AF734 original issue, section 3. Accomplishment Instructions. FAA AD Differences (f) None. Other FAA AD Provisions (g) Alternative Methods of Compliance (AMOCs): 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 Airworthiness Directive 2007–0267–E, dated October 8, 2007, and RR Alert Service Bulletin RB.211– 72–AF734, dated October 3, 2007, for related information. (i) Contact James Lawrence, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: james.lawrence@faa.gov; telephone (781) 238–7176; fax (781) 238– 7199, for more information about this AD. Material Incorporated by Reference (j) None. Issued in Burlington, Massachusetts, on May 23, 2008. Robert G. Mann, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E8–12061 Filed 5–29–08; 8:45 am] BILLING CODE 4910–13–P Register approves this incorporation by reference action under 1 CFR part 51, subject to the annual revision of FAA Order 7400.9 and publication of conforming amendments. FOR FURTHER INFORMATION CONTACT: Ken McElroy, Airspace and Rules Group, Office of System Operations Airspace and AIM, Federal Aviation Administration, 800 Independence Avenue, SW., Washington, DC 20591; telephone: (202) 267–8783. SUPPLEMENTARY INFORMATION: History On February 19, 2008, the FAA published in the Federal Register a notice of proposed rulemaking (NPRM) to establish four low altitude T-routes in the San Francisco terminal area (73 FR 9060). Interested parties were invited to participate in this rulemaking effort by submitting written comments on this proposal to the FAA. Three comments were received in response to the NPRM and are discussed below. With the exception of minor adjustments to the longitude position of the Very High Frequency Omnidirectional Range/ Tactical Air Navigation (VORTACs) at Point Reyes, Sacramento, and Woodside, this amendment is the same as that proposed in the NPRM. Analysis of Comments DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 [Docket No. FAA–2008–0037; Airspace Docket No. 07–AWP–6] Establishment of Low Altitude Area Navigation Routes (T-Routes); Sacramento and San Francisco, CA Federal Aviation Administration (FAA), DOT. ACTION: Final rule. ebenthall on PRODPC60 with RULES AGENCY: SUMMARY: This action establishes four low altitude Area Navigation (RNAV) T-routes, designated T–257, T–259, T–261 and T–263, in the Sacramento and San Francisco, CA, terminal areas. T-routes are low altitude Air Traffic Service (ATS) routes, based on RNAV, for use by aircraft having instrument flight rules (IFR)-approved Global Positioning System (GPS)/Global Navigation Satellite System (GNSS) equipment. The FAA is taking this action to enhance safety and improve the efficient use of the navigable airspace in the Sacramento and San Francisco, CA, terminal areas. DATES: Effective Date: 0901 UTC, July 31, 2008. The Director of the Federal VerDate Aug<31>2005 13:51 May 29, 2008 Jkt 214001 The Aircraft Owners and Pilots Association supports the establishment of the low level area navigation routes. One commenter requested that T–259 be moved further south to avoid a heavily used VFR flight training area or the floor of the airway be raised to 6,500 feet for separation from the training area. FAA Response: The proposed T–259 overlies the existing Risti Four Arrival route into San Francisco, which is heavily used daily. Operation in the Tracy practice area will continue. Currently, participants in the practice area contact the Northern California TRACON (NCT) when the practice area is being utilized. The exact location and altitudes are coordinated at that time. NCT avoids the area when routing IFR traffic and the current practice will continue. Another commenter raised four questions concerning operations on the T-routes. (1) Are there defined entry/exit points other than the end points of the routes? FAA Response: These routes are available to Air Traffic Control (ATC) the same as other airways and the T-routes will be utilized in the same fashion. (2) How would a pilot destined for Half Moon Bay (HAF) from the south PO 00000 Frm 00007 Fmt 4700 Sfmt 4700 31021 describe their desire to leave T–257 at an appropriate point? FAA Response: The T-routes, as described, are to be utilized by aircraft overflying the terminal area, not landing within it. An aircraft inbound to HAF from the south would not be assigned this route. (3) Is it expected that a pilot from Watsonville (WVI) could file and receive a direct clearance to San Jose in order to join T–259? FAA Response: T–259 is designed to facilitate Palo Alto and San Carlos departures through the Class B Terminal Area. The NCT does not plan to make this route available to WVI departures due to operations in and out of SJC. (4) Will these routes be available in all wind conditions? FAA Response: These routes will be available in all wind configurations. However, dynamic re-routes based on weather conditions is a tool always available to ATC. The Rule The FAA is amending to Title 14 Code of Federal Regulations (14 CFR) part 71 to establish four low altitude RNAV T-routes in the Sacramento and San Francisco, CA, terminal areas. The routes would be designated T–257, T–259, T–261 and T–263, and would be depicted on the appropriate IFR En Route Low Altitude charts. T-routes are low altitude RNAV ATS routes, similar to Very High Frequency Omnidirectional Range Federal airways, but based on GNSS navigation. RNAVequipped aircraft capable of filing flight plan equipment suffix ‘‘G’’ may file for these routes. The T-routes described in this notice are being established to enhance safety and to facilitate the more flexible and efficient use of the navigable airspace for en route IFR operations transitioning through and around the Sacramento and San Francisco, CA, terminal areas. Low altitude RNAV T-routes are published in paragraph 6011 of FAA Order 7400.9R signed August 15, 2007, and effective September 15, 2007, which is incorporated by reference in 14 CFR 71.1. The low altitude RNAV T-routes listed in this document would be published subsequently in the Order. The FAA has determined that this regulation only involves an established body of technical regulations for which frequent and routine amendments are necessary to keep them operationally current. Therefore, this regulation: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866; (2) is not a ‘‘significant rule’’ under Department of Transportation (DOT) Regulatory Policies and Procedures (44 FR 11034; E:\FR\FM\30MYR1.SGM 30MYR1

Agencies

[Federal Register Volume 73, Number 105 (Friday, May 30, 2008)]
[Rules and Regulations]
[Pages 31019-31021]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-12061]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0597; Directorate Identifier 2008-NE-12-AD; 
Amendment 39-15542; AD 2008-11-19]
RIN 2120-AA64


Airworthiness Directives; Rolls-Royce plc (RR) Models Trent 768-
60, 772-60, 772B-60, and 772C-60 Turbofan Engines

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

ACTION: Final rule; request for comments.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for the 
products listed above. This AD results from mandatory continuing 
airworthiness information (MCAI) issued by an aviation authority of 
another country to identify and correct an unsafe condition on an 
aviation product. The MCAI describes the unsafe condition as:

    Three Trent 700 IP Turbine discs that exhibited signs of wear at 
the bore following failure of the bearing chamber sealing sleeve 
were returned to service. This was based on the fact that Non-
Destructive Testing (NDT) did not reveal micro cracking on the 
affected disc areas. Further engineering investigation considered 
that, although no micro cracking had been found, the worn disc bore 
surfaces would have an associated fatigue penalty compared to an 
unaffected bore. A crack developing from these rubbed surfaces could 
potentially lead to a disc burst.
    As the described wear, present at the bores of those three 
discs, presents a potential unsafe condition, this Airworthiness 
Directive requires identification of the three affected serial 
numbers of IP Turbine Discs (P/N FK20795) and removal from service 
prior to attaining a certain number of cycles, as indicated.

We are issuing this AD to prevent a failure of the intermediate 
pressure (IP) turbine disc that could result in an uncontained failure 
of the engine and possible damage to the airplane.

DATES: This AD becomes effective June 16, 2008.
    We must receive comments on this AD by June 30, 2008.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to https://
www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: U.S. 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.

Examining the AD Docket

    You may examine the AD docket on the Internet at https://
www.regulations.gov; or in person at the Docket Operations office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains this AD, the regulatory evaluation, 
any comments received, and other information. The street address for 
the Docket Operations office (telephone (800) 647-5527) is the same as 
the Mail address provided in the ADDRESSES section. Comments will be 
available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: James Lawrence, Aerospace Engineer, 
Engine Certification Office, FAA, Engine and Propeller Directorate, 12 
New England Executive Park, Burlington, MA 01803; e-mail: 
james.lawrence@faa.gov; telephone (781) 238-7176; fax (781) 238-7199.

SUPPLEMENTARY INFORMATION:

Discussion

    The European Aviation Safety Agency (EASA), which is the Technical 
Agent for the Member States of the European Community, has issued EASA 
Airworthiness Directive 2007-0267-E, dated October 8, 2007 (referred to 
after this as ``the MCAI''), to correct an unsafe condition for the 
specified products. The MCAI states:

    Three Trent 700 IP Turbine discs that exhibited signs of wear at 
the bore following failure of the bearing chamber sealing sleeve 
were returned to service. This was based on the fact that Non-
Destructive Testing (NDT) did not reveal micro cracking on the 
affected disc areas. Further engineering investigation considered 
that, although no micro cracking had been found, the worn disc bore 
surfaces would have an associated fatigue penalty compared to an 
unaffected bore. A crack developing from these rubbed surfaces could 
potentially lead to a disc burst.
    As the described wear, present at the bores of those three 
discs, presents a potential unsafe condition, this Airworthiness 
Directive requires identification of the three affected serial 
numbers of IP Turbine Discs (P/N FK20795) and removal from service 
prior to attaining a certain number of cycles, as indicated.

    You may obtain further information by examining the MCAI in the AD 
docket.

[[Page 31020]]

Relevant Service Information

    Rolls-Royce has issued Alert Service Bulletin RB.211-72-AF734, 
dated October 3, 2007. The actions described in this service 
information are intended to correct the unsafe condition identified in 
the MCAI.

FAA's Determination and Requirements of This AD

    This product has been approved by the aviation authority of the 
United Kingdom, and is approved for operation in the United States. 
Pursuant to our bilateral agreement with the United Kingdom, they have 
notified us of the unsafe condition described in the EASA AD and 
service information referenced above. We are proposing this AD because 
we evaluated all information provided by EASA and determined the unsafe 
condition exists and is likely to exist or develop on other products of 
the same type design.

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 we did not precede it by notice and opportunity for public 
comment. We invite you to send any written relevant data, views, or 
arguments about this AD. Send your comments to an address listed under 
the ADDRESSES section. Include ``Docket No. FAA-2008-0597; Directorate 
Identifier 2008-NE-12-AD'' at the beginning of your comments. We 
specifically invite comments on the overall regulatory, economic, 
environmental, and energy aspects of this AD. We will consider all 
comments received by the closing date and may amend this AD because of 
those comments.
    We will post all comments we receive, without change, to https://
www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this AD. Using the search function of the Web site, 
anyone can find and read the comments in any of our dockets, including, 
if provided, 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).

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 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 this AD:
    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 regulatory evaluation of the estimated costs to 
comply with this AD and placed it in the AD docket.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 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 AD:

2008-11-19 Rolls-Royce plc: Amendment 39-15542; Docket No. FAA-2008-
0597; Directorate Identifier 2008-NE-12-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective June 16, 
2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Rolls-Royce plc models Trent 768-60, 772-
60, 772B-60, 772C-60 turbofan engines with intermediate pressure 
(IP) turbine discs, part number (P/N) FK20795, that have a serial 
number specified in Table 1 of this AD, installed. These engines are 
installed on, but not limited to, Airbus 330 series airplanes.

Reason

    (d) Three Trent 700 IP Turbine discs that exhibited signs of 
wear at the bore following failure of the bearing chamber sealing 
sleeve were returned to service. This was based on the fact that 
Non-Destructive testing (NDT) did not reveal micro cracking on the 
affected disc areas. Further engineering investigation considered 
that, although no micro cracking had been found, the worn disc bore 
surfaces would have an associated fatigue penalty compared to an 
unaffected bore. A crack developing from these rubbed surfaces could 
potentially lead to a disc burst.
    As the described wear, present at the bores of those three 
discs, presents a potentially unsafe condition, this Airworthiness 
Directive requires identification of the three affected serial 
numbers of IP Turbine Discs (P/N FK20795) and removal from service 
prior to attaining a certain number of cycles, as indicated.
    We are issuing this AD to prevent a failure of the IP turbine 
disc that could result in an uncontained failure of the engine and 
possible damage to the airplane.

Actions and Compliance

    (e) Unless already done, do the following actions.
    (1) The affected IP Turbine Discs, P/N FK20795, must be removed 
from service prior to attaining the following number of Cycles Since 
New (CSN):

   Table 1.--IP Turbine Discs by Engine Serial Number and Disc Serial
                                 Number
------------------------------------------------------------------------
                                                           Removal limit
                       Serial No.                             in CSN
------------------------------------------------------------------------
CREB452.................................................           7,960
CREB216.................................................           7,930
CREB322.................................................           7,500
------------------------------------------------------------------------

    (2) For detailed instructions, refer to Rolls-Royce RB211 
Propulsion System Non-Modification Service Bulletin RB211-72-

[[Page 31021]]

AF734 original issue, section 3. Accomplishment Instructions.

FAA AD Differences

    (f) None.

Other FAA AD Provisions

    (g) Alternative Methods of Compliance (AMOCs): 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 Airworthiness Directive 2007-0267-E, 
dated October 8, 2007, and RR Alert Service Bulletin RB.211-72-
AF734, dated October 3, 2007, for related information.
    (i) Contact James Lawrence, Aerospace Engineer, Engine 
Certification Office, FAA, Engine and Propeller Directorate, 12 New 
England Executive Park, Burlington, MA 01803; e-mail: 
james.lawrence@faa.gov; telephone (781) 238-7176; fax (781) 238-
7199, for more information about this AD.

Material Incorporated by Reference

    (j) None.

    Issued in Burlington, Massachusetts, on May 23, 2008.
Robert G. Mann,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
 [FR Doc. E8-12061 Filed 5-29-08; 8:45 am]
BILLING CODE 4910-13-P
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