80_FR_11577 80 FR 11535 - Airworthiness Directives; Rolls-Royce plc Turbofan Engines

80 FR 11535 - Airworthiness Directives; Rolls-Royce plc Turbofan Engines

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 80, Issue 42 (March 4, 2015)

Page Range11535-11536
FR Document2015-04044

We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211 Trent 875-17, 877-17, 884-17, 884B-17, 892- 17, 892B-17, and 895-17 turbofan engines. This AD requires modification of the engine by installing upgraded software in the electronic engine control (EEC) or by removing any EEC that incorporates a software standard prior to B7.2 and installing an EEC eligible for installation. This AD was prompted by failure of the intermediate pressure (IP) turbine disk drive arm and subsequent overspeed and burst of the IP turbine disk on an RR RB211 Trent turbofan engine. We are issuing this AD to prevent overspeed of the IP turbine disk, resulting in failure of the turbine blades or the IP turbine disk and subsequent uncontained release of the turbine disk and/or blades, which could lead to damage to the engine and damage to the airplane.

Federal Register, Volume 80 Issue 42 (Wednesday, March 4, 2015) 
[Federal Register Volume 80, Number 42 (Wednesday, March 4, 2015)]
[Rules and Regulations]
[Pages 11535-11536]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2015-04044]



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Federal Register / Vol. 80, No. 42 / Wednesday, March 4, 2015 / Rules 
and Regulations

[[Page 11535]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2014-0328; Directorate Identifier 2014-NE-07-AD; 
Amendment 39-18108; AD 2015-04-06]
RIN 2120-AA64


Airworthiness Directives; Rolls-Royce plc Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for all 
Rolls-Royce plc (RR) RB211 Trent 875-17, 877-17, 884-17, 884B-17, 892-
17, 892B-17, and 895-17 turbofan engines. This AD requires modification 
of the engine by installing upgraded software in the electronic engine 
control (EEC) or by removing any EEC that incorporates a software 
standard prior to B7.2 and installing an EEC eligible for installation. 
This AD was prompted by failure of the intermediate pressure (IP) 
turbine disk drive arm and subsequent overspeed and burst of the IP 
turbine disk on an RR RB211 Trent turbofan engine. We are issuing this 
AD to prevent overspeed of the IP turbine disk, resulting in failure of 
the turbine blades or the IP turbine disk and subsequent uncontained 
release of the turbine disk and/or blades, which could lead to damage 
to the engine and damage to the airplane.

DATES: This AD becomes effective April 8, 2015.

ADDRESSES: For service information identified in this AD, contact 
Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, England, 
DE24 8BJ; phone: 011-44-1332-242424; fax: 011-44-1332-249936; email: 
http://www.rolls-royce.com/contact/civil_team.jsp; Internet: https://www.aeromanager.com. You may view this service information at the FAA, 
Engine & Propeller Directorate, 12 New England Executive Park, 
Burlington, MA. For information on the availability of this material at 
the FAA, call 781-238-7125.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2014-
0328; or in person at the Docket Management Facility between 9 a.m. and 
5 p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this AD, the mandatory continuing airworthiness information 
(MCAI), the regulatory evaluation, any comments received, and other 
information. The address for the Docket Office (phone: 800-647-5527) is 
Document Management Facility, U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Wego Wang, Aerospace Engineer, Engine 
Certification Office, FAA, Engine & Propeller Directorate, 12 New 
England Executive Park, Burlington, MA 01803; phone: 781-238-7134; fax: 
781-238-7199; email: [email protected].

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 by adding an AD that would apply to the specified products. The 
NPRM was published in the Federal Register on July 11, 2014 (79 FR 
40018). The NPRM proposed to correct an unsafe condition for the 
specified products. The MCAI states:

    A Trent engine experienced an engine internal fire, caused by 
combustion of carbon deposits inside the high/intermediate (HP/IP) 
oil vent tubes. The consequent chain of events resulted in the 
failure of the IP turbine disk drive arm. Similar engine 
architecture exists on Trent 800 series engines.
    This condition, if not corrected, could lead to uncontained 
multiple turbine blade failures or an IP turbine disk burst, 
possibly resulting in damage to, and reduced control of, the 
aeroplane.
    Prompted by these findings, an Intermediate Pressure Turbine 
Overspeed System (IPTOS) protection scheme has been developed for 
Trent 800 engines installed on Boeing 777 aeroplanes.
    For the reasons described above, this AD requires introduction 
of the IPTOS protection function by installation of a new software 
standard (B7.2) in the engine electronic controller (EEC), which 
will protect against IP turbine overspeed when IP shaft failure is 
detected.

    Since we issued the NPRM (79 FR 40018, July 11, 2014), we issued a 
supplemental NPRM (79 FR 70475, November 26, 2014) to amend the costs 
of compliance and to more clearly state certain compliance 
requirements. Since we issued the supplemental NPRM, we changed 
paragraph (e) of this AD for clarity.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We considered the comments received.

Request To Modify the Installation Prohibition Paragraph

    American Airlines (AA) requested that we modify the Installation 
Prohibition paragraph (f) to allow installation of an EEC with a 
software standard earlier than B7.2, and coincident on-wing upgrade of 
the software standard to B7.2 or later, but prohibit operation of an 
engine that incorporates a software standard earlier than B7.2. AA 
states that the EEC original equipment manufacturer does not update the 
software as part of a component shop visit.
    We agree. We modified the Installation Prohibition paragraph (f) to 
allow installation of an EEC with a software standard earlier than 
B7.2, but to prohibit operation of an engine with a software standard 
earlier than B7.2.

Conclusion

    We reviewed the available data, including the comment received, and 
determined that air safety and the public interest require adopting 
this AD with the changes described previously. We determined that these 
changes will not increase the economic burden on any operator or 
increase the scope of this AD.

Costs of Compliance

    We estimate that this AD affects about 140 engines installed on 
airplanes of U.S. registry. We also estimate that it would take about 2 
hours per engine to

[[Page 11536]]

comply with this AD. The average labor rate is $85 per hour. Based on 
these figures, we estimate the cost of this AD on U.S. operators to be 
$23,800.

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),
    (3) Will not affect intrastate aviation in Alaska to the extent 
that it justifies making a regulatory distinction, and
    (4) 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    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 airworthiness 
directive (AD):

2015-04-06 Rolls-Royce plc Turbofan Engines: Amendment 39-18108; 
Docket No. FAA-2014-0328; Directorate Identifier 2014-NE-07-AD.

(a) Effective Date

    This AD becomes effective April 8, 2015.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all Rolls-Royce plc (RR) RB211 Trent 875-17, 
877-17, 884-17, 884B-17, 892-17, 892B-17, and 895-17 turbofan 
engines.

(d) Reason

    This AD was prompted by failure of the intermediate pressure 
(IP) turbine disk drive arm and subsequent overspeed and burst of 
the IP turbine disk on an RR RB211 Trent turbofan engine. We are 
issuing this AD to prevent overspeed of the IP turbine disk, 
resulting in failure of the turbine blades or the IP turbine disk 
and subsequent uncontained release of the turbine disk and/or 
blades, which could lead to damage to the engine and damage to the 
airplane.

(e) Actions and Compliance

    Twelve months after the effective date of this AD, do not 
operate any engine with an electronic engine control (EEC) software 
standard earlier than B7.2.

(f) Installation Prohibition

    After removing any software standard earlier than B7.2 from an 
ECC on any engine, do not operate that engine with any software 
standard earlier than B7.2.

(g) Alternative Methods of Compliance (AMOCs)

    The Manager, Engine Certification Office, FAA, may approve AMOCs 
to this AD. Use the procedures found in 14 CFR 39.19 to make your 
request. You may email your request to: [email protected].

(h) Related Information

    (1) For more information about this AD, contact Wego Wang, 
Aerospace Engineer, Engine Certification Office, FAA, Engine & 
Propeller Directorate, 12 New England Executive Park, Burlington, MA 
01803; phone: 781-238-7134; fax: 781-238-7199; email: 
[email protected].
    (2) Refer to MCAI European Aviation Safety Agency AD 2014-0051, 
dated March 6, 2014, for more information. You may examine the MCAI 
in the AD docket on the Internet at http://www.regulations.gov/#!documentDetail;D=FAA-2014-0328-0003.
    (3) RR Alert Service Bulletin No. RB.211-73-AH001, dated July 
17, 2013, which is not incorporated by reference in this AD, can be 
obtained from Rolls-Royce plc, using the contact information in 
paragraph (h)(4) of this AD.
    (4) For service information identified in this AD, contact 
Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, 
England, DE24 8BJ; phone: 011-44-1332-242424; fax: 011-44-1332-
249936; email: http://www.rolls-royce.com/contact/civil_team.jsp; or 
Internet: https://www.aeromanager.com.
    (5) You may view this service information at the FAA, Engine & 
Propeller Directorate, 12 New England Executive Park, Burlington, 
MA. For information on the availability of this material at the FAA, 
call 781-238-7125.

(i) Material Incorporated by Reference

    None.

    Issued in Burlington, Massachusetts, on February 19, 2015.
Colleen M. D'Alessandro,
Assistant Directorate Manager, Engine & Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 2015-04044 Filed 3-3-15; 8:45 am]
BILLING CODE 4910-13-P

11535 Rules and Regulations Federal Register Vol. 80, No. 42 Wednesday, March 4, 2015 This section of the FEDERAL REGISTER team.jsp; Internet: https:// System (IPTOS) protection scheme has been contains regulatory documents having general www.aeromanager.com. You may view developed for Trent 800 engines installed on applicability and legal effect, most of which this service information at the FAA, Boeing 777 aeroplanes. are keyed to and codified in the Code of Engine & Propeller Directorate, 12 New For the reasons described above, this AD Federal Regulations, which is published under requires introduction of the IPTOS protection England Executive Park, Burlington, function by installation of a new software 50 titles pursuant to 44 U.S.C. 1510. MA. For information on the availability standard (B7.2) in the engine electronic The Code of Federal Regulations is sold by of this material at the FAA, call 781– controller (EEC), which will protect against the Superintendent of Documents. Prices of 238–7125. IP turbine overspeed when IP shaft failure is new books are listed in the first FEDERAL detected. REGISTER issue of each week. Examining the AD Docket You may examine the AD docket on Since we issued the NPRM (79 FR the Internet at http:// 40018, July 11, 2014), we issued a DEPARTMENT OF TRANSPORTATION www.regulations.gov by searching for supplemental NPRM (79 FR 70475, and locating Docket No. FAA–2014– November 26, 2014) to amend the costs Federal Aviation Administration 0328; or in person at the Docket of compliance and to more clearly state Management Facility between 9 a.m. certain compliance requirements. Since 14 CFR Part 39 and 5 p.m., Monday through Friday, we issued the supplemental NPRM, we except Federal holidays. The AD docket changed paragraph (e) of this AD for [Docket No. FAA–2014–0328; Directorate clarity. Identifier 2014–NE–07–AD; Amendment 39– contains this AD, the mandatory 18108; AD 2015–04–06] continuing airworthiness information Comments (MCAI), the regulatory evaluation, any RIN 2120–AA64 We gave the public the opportunity to comments received, and other participate in developing this AD. We Airworthiness Directives; Rolls-Royce information. The address for the Docket considered the comments received. plc Turbofan Engines Office (phone: 800–647–5527) is Document Management Facility, U.S. Request To Modify the Installation AGENCY: Federal Aviation Department of Transportation, Docket Prohibition Paragraph Administration (FAA), DOT. Operations, M–30, West Building American Airlines (AA) requested ACTION: Final rule. Ground Floor, Room W12–140, 1200 that we modify the Installation New Jersey Avenue SE., Washington, Prohibition paragraph (f) to allow SUMMARY: We are adopting a new DC 20590. airworthiness directive (AD) for all installation of an EEC with a software FOR FURTHER INFORMATION CONTACT: standard earlier than B7.2, and Rolls-Royce plc (RR) RB211 Trent 875– Wego Wang, Aerospace Engineer, 17, 877–17, 884–17, 884B–17, 892–17, coincident on-wing upgrade of the Engine Certification Office, FAA, Engine software standard to B7.2 or later, but 892B–17, and 895–17 turbofan engines. & Propeller Directorate, 12 New England This AD requires modification of the prohibit operation of an engine that Executive Park, Burlington, MA 01803; incorporates a software standard earlier engine by installing upgraded software phone: 781–238–7134; fax: 781–238– in the electronic engine control (EEC) or than B7.2. AA states that the EEC 7199; email: wego.wang@faa.gov. original equipment manufacturer does by removing any EEC that incorporates SUPPLEMENTARY INFORMATION: not update the software as part of a a software standard prior to B7.2 and installing an EEC eligible for component shop visit. Discussion installation. This AD was prompted by We agree. We modified the We issued a notice of proposed Installation Prohibition paragraph (f) to failure of the intermediate pressure (IP) rulemaking (NPRM) to amend 14 CFR turbine disk drive arm and subsequent allow installation of an EEC with a part 39 by adding an AD that would software standard earlier than B7.2, but overspeed and burst of the IP turbine apply to the specified products. The disk on an RR RB211 Trent turbofan to prohibit operation of an engine with NPRM was published in the Federal a software standard earlier than B7.2. engine. We are issuing this AD to Register on July 11, 2014 (79 FR 40018). prevent overspeed of the IP turbine disk, The NPRM proposed to correct an Conclusion resulting in failure of the turbine blades unsafe condition for the specified We reviewed the available data, or the IP turbine disk and subsequent products. The MCAI states: including the comment received, and uncontained release of the turbine disk A Trent engine experienced an engine determined that air safety and the and/or blades, which could lead to internal fire, caused by combustion of carbon public interest require adopting this AD damage to the engine and damage to the deposits inside the high/intermediate (HP/IP) with the changes described previously. airplane. oil vent tubes. The consequent chain of We determined that these changes will DATES: This AD becomes effective April events resulted in the failure of the IP turbine not increase the economic burden on 8, 2015. disk drive arm. Similar engine architecture any operator or increase the scope of exists on Trent 800 series engines. ebenthall on DSK5SPTVN1PROD with RULES ADDRESSES: For service information this AD. identified in this AD, contact Rolls- This condition, if not corrected, could lead to uncontained multiple turbine blade Costs of Compliance Royce plc, Corporate Communications, failures or an IP turbine disk burst, possibly P.O. Box 31, Derby, England, DE24 8BJ; resulting in damage to, and reduced control We estimate that this AD affects about phone: 011–44–1332–242424; fax: 011– of, the aeroplane. 140 engines installed on airplanes of 44–1332–249936; email: http:// Prompted by these findings, an U.S. registry. We also estimate that it www.rolls-royce.com/contact/civil_ Intermediate Pressure Turbine Overspeed would take about 2 hours per engine to VerDate Sep<11>2014 22:23 Mar 03, 2015 Jkt 235001 PO 00000 Frm 00001 Fmt 4700 Sfmt 4700 E:\FR\FM\04MRR1.SGM 04MRR1

11536 Federal Register / Vol. 80, No. 42 / Wednesday, March 4, 2015 / Rules and Regulations comply with this AD. The average labor PART 39—AIRWORTHINESS (3) RR Alert Service Bulletin No. RB.211– rate is $85 per hour. Based on these DIRECTIVES 73–AH001, dated July 17, 2013, which is not figures, we estimate the cost of this AD incorporated by reference in this AD, can be ■ 1. The authority citation for part 39 obtained from Rolls-Royce plc, using the on U.S. operators to be $23,800. continues to read as follows: contact information in paragraph (h)(4) of Authority for This Rulemaking this AD. Authority: 49 U.S.C. 106(g), 40113, 44701. (4) For service information identified in Title 49 of the United States Code this AD, contact Rolls-Royce plc, Corporate specifies the FAA’s authority to issue § 39.13 [Amended] Communications, P.O. Box 31, Derby, rules on aviation safety. Subtitle I, ■ 2. The FAA amends § 39.13 by adding England, DE24 8BJ; phone: 011–44–1332– section 106, describes the authority of the following new airworthiness 242424; fax: 011–44–1332–249936; email: the FAA Administrator. ‘‘Subtitle VII: directive (AD): http://www.rolls-royce.com/contact/civil_ Aviation Programs,’’ describes in more team.jsp; or Internet: https:// 2015–04–06 Rolls-Royce plc Turbofan www.aeromanager.com. detail the scope of the Agency’s Engines: Amendment 39–18108; Docket (5) You may view this service information authority. No. FAA–2014–0328; Directorate at the FAA, Engine & Propeller Directorate, We are issuing this rulemaking under Identifier 2014–NE–07–AD. 12 New England Executive Park, Burlington, the authority described in ‘‘Subtitle VII, (a) Effective Date MA. For information on the availability of Part A, Subpart III, Section 44701: this material at the FAA, call 781–238–7125. This AD becomes effective April 8, 2015. General requirements.’’ Under that (i) Material Incorporated by Reference section, Congress charges the FAA with (b) Affected ADs None. promoting safe flight of civil aircraft in None. air commerce by prescribing regulations Issued in Burlington, Massachusetts, on (c) Applicability February 19, 2015. for practices, methods, and procedures This AD applies to all Rolls-Royce plc (RR) Colleen M. D’Alessandro, the Administrator finds necessary for RB211 Trent 875–17, 877–17, 884–17, 884B– safety in air commerce. This regulation Assistant Directorate Manager, Engine & 17, 892–17, 892B–17, and 895–17 turbofan is within the scope of that authority Propeller Directorate, Aircraft Certification engines. because it addresses an unsafe condition Service. that is likely to exist or develop on (d) Reason [FR Doc. 2015–04044 Filed 3–3–15; 8:45 am] products identified in this rulemaking This AD was prompted by failure of the BILLING CODE 4910–13–P action. intermediate pressure (IP) turbine disk drive arm and subsequent overspeed and burst of Regulatory Findings the IP turbine disk on an RR RB211 Trent DEPARTMENT OF TRANSPORTATION turbofan engine. We are issuing this AD to We determined that this AD will not prevent overspeed of the IP turbine disk, Federal Aviation Administration have federalism implications under resulting in failure of the turbine blades or Executive Order 13132. This AD will the IP turbine disk and subsequent 14 CFR Part 91 not have a substantial direct effect on uncontained release of the turbine disk and/ the States, on the relationship between or blades, which could lead to damage to the [Docket No. FAA–2007–29305; Amdt. No. the national government and the States, engine and damage to the airplane. 91–336A] or on the distribution of power and (e) Actions and Compliance RIN 2120–AI92 responsibilities among the various Twelve months after the effective date of levels of government. this AD, do not operate any engine with an Automatic Dependent Surveillance- For the reasons discussed above, I electronic engine control (EEC) software Broadcast (ADS–B) Out Performance certify this AD: standard earlier than B7.2. Requirements To Support Air Traffic (1) Is not a ‘‘significant regulatory Control (ATC) Service; Technical (f) Installation Prohibition action’’ under Executive Order 12866, Amendment; Correction After removing any software standard (2) Is not a ‘‘significant rule’’ under earlier than B7.2 from an ECC on any engine, AGENCY: Federal Aviation the DOT Regulatory Policies and do not operate that engine with any software Administration, DOT. Procedures (44 FR 11034, February 26, standard earlier than B7.2. ACTION: Final rule; correction of a 1979), (g) Alternative Methods of Compliance technical amendment. (3) Will not affect intrastate aviation (AMOCs) in Alaska to the extent that it justifies The Manager, Engine Certification Office, SUMMARY: The FAA is correcting a final making a regulatory distinction, and FAA, may approve AMOCs to this AD. Use rule technical amendment published on (4) Will not have a significant the procedures found in 14 CFR 39.19 to February 9, 2015 (80 FR 6899). In that economic impact, positive or negative, make your request. You may email your final rule, which became effective on on a substantial number of small entities request to: ANE-AD-AMOC@faa.gov. the date of publication, the FAA under the criteria of the Regulatory (h) Related Information corrected errors in regulatory provisions Flexibility Act. addressing Automatic Dependent (1) For more information about this AD, Surveillance-Broadcast Out equipment List of Subjects in 14 CFR Part 39 contact Wego Wang, Aerospace Engineer, Engine Certification Office, FAA, Engine & and use. The FAA inadvertently listed Air transportation, Aircraft, Aviation Propeller Directorate, 12 New England an incorrect Amendment Number for safety, Incorporation by reference, Executive Park, Burlington, MA 01803; that final rule. This document corrects phone: 781–238–7134; fax: 781–238–7199; that error. ebenthall on DSK5SPTVN1PROD with RULES Safety. email: wego.wang@faa.gov. DATES: Effective: March 4, 2015. Adoption of the Amendment (2) Refer to MCAI European Aviation FOR FURTHER INFORMATION CONTACT: For Safety Agency AD 2014–0051, dated March Accordingly, under the authority 6, 2014, for more information. You may technical questions concerning this delegated to me by the Administrator, examine the MCAI in the AD docket on the action, contact Robert F. Nichols, Jr., the FAA amends 14 CFR part 39 as Internet at http://www.regulations.gov/ Surveillance Services Group Manager, follows: #!documentDetail;D=FAA-2014-0328-0003. AJM–23, Air Traffic Organization, VerDate Sep<11>2014 22:23 Mar 03, 2015 Jkt 235001 PO 00000 Frm 00002 Fmt 4700 Sfmt 4700 E:\FR\FM\04MRR1.SGM 04MRR1


Document Created: 2018-02-21 09:31:53
Document Modified: 2018-02-21 09:31:53
CategoryRegulatory Information
CollectionFederal Register
sudoc ClassAE 2.7:
GS 4.107:
AE 2.106:
PublisherOffice of the Federal Register, National Archives and Records Administration
SectionRules and Regulations
ActionFinal rule.
DatesThis AD becomes effective April 8, 2015.
ContactWego Wang, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7134; fax: 781-238-7199; email: [email protected]
FR Citation80 FR 11535 
RIN Number2120-AA64
CFR AssociatedAir Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety
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