[Federal Register Volume 75, Number 87 (Thursday, May 6, 2010)]
[Proposed Rules]
[Pages 24825-24828]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2010-10739]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2007-0037; Directorate Identifier 2007-NE-41-AD]
RIN 2120-AA64
Airworthiness Directives; Rolls-Royce Deutschland Ltd. & Co. KG
(RRD) Models Tay 650-15 and Tay 651-54 Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: We propose to supersede an existing airworthiness directive
(AD) for
[[Page 24826]]
Tay 650-15 turbofan engines. That AD currently requires initial and
repetitive inspections of the low-pressure (LP) turbine discs stage 2
and stage 3 for corrosion, on certain Tay 650-15 serial number engines.
This proposed 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: Strip results from some of the
engines listed in the applicability section of this AD revealed
excessively corroded low-pressure turbine disks stage 2 and stage 3.
The corrosion is considered to be caused by the environment in which
these engines are operated. Following a life assessment based on the
strip findings it is concluded that inspections for corrosion attack
are required. The action specified by this European Aviation Safety
Agency (EASA) AD 2008-0122 was intended to avoid a failure of a low-
pressure turbine disk stage 2 or stage 3 due to potential corrosion
problems which could result in uncontained engine failure and damage to
the airplane. It has been later realized that the same unsafe condition
could potentially occur on more serial numbers for the Tay 650-15
engines and on the Tay 651-54 engines. This AD, superseding EASA AD
2008-0122, retaining its requirements, is therefore issued to expand
the Applicability in adding further engine serial numbers for the Tay
650-15 engines and in adding the Tay 651-54 engines.
We are proposing this AD to detect corrosion that could cause the
stage 2 or stage 3 disk of the LP turbine to fail and result in an
uncontained failure of the engine.
DATES: We must receive comments on this proposed AD by June 21, 2010.
ADDRESSES: You may send comments by any of the following methods:
Federal eRulemaking Portal: Go to http://www.regulations.gov and follow the instructions for sending your
comments electronically.
Mail: Docket Management Facility, 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.
Contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11,
Dahlwitz, 15827 Blankenfelde-Mahlow, Germany; phone: 011 49 (0) 33-
7086-1883; fax: 011 49 (0) 33-7086-3276, for the service information
identified in this proposed AD.
Examining the AD Docket
You may examine the AD docket on the Internet at http://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 proposed AD, the regulatory
evaluation, any comments received, and other information. The street
address for the Docket Operations office (phone: (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: Tara Chaidez, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803; e-mail:
[email protected]; phone: (781) 238-7773; fax: (781) 238-7199.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send any written relevant data, views, or
arguments about this proposed AD. Send your comments to an address
listed under the ADDRESSES section. Include ``Docket No. FAA-2007-0037;
Directorate Identifier 2007-NE-41-AD'' at the beginning of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of this proposed AD. We
will consider all comments received by the closing date and may amend
this proposed AD based on those comments.
We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact
with FAA personnel concerning this proposed 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).
Discussion
On October 8, 2009, the FAA issued AD 2009-22-01 (Amendment 39-
16052 (74 FR 55121, October 27, 2009), which superseded AD 2008-10-14
(Amendment 39-15521, 73 FR 29405, May 21, 2008). AD 2009-22-01 requires
initial and repetitive inspections of the LP turbine discs stage 2 and
stage 3 for corrosion on 79 engines by serial number. That AD was the
result of MCAI issued by an aviation authority of another country to
identify and correct an unsafe condition on an aviation product. That
condition, if not corrected, could result in the stage 2 or stage 3
disk of the LP turbine to fail and result in an uncontained failure of
the engine.
Since AD 2009-22-01 was issued, RRD identified 14 additional Tay
650-15 engines by serial number that require the same inspections. RRD
also expanded the applicability to all Tay 651-54 engines. EASA, which
is the Technical Agent for the Member States of the European Community,
has issued EASA AD 2010-0060R1, dated April 14, 2010. That MCAI extends
the applicability to include the 14 additional Tay 650-15 engine serial
numbers and Tay 651-54 engines for inspections. You may obtain further
information by examining the MCAI in the AD docket.
Relevant Service Information
Rolls-Royce Deutschland has issued Alert Service Bulletin No. TAY-
72-A1524, Revision 3, dated March 24, 2010. 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 Proposed AD
These products have been approved by the United Kingdom (UK), and
are approved for operation in the United States. Pursuant to our
bilateral agreement with the UK, they have notified us of the unsafe
condition described in the MCAI ADs, and service information referenced
above. We are proposing this AD because we evaluated all pertinent
information and determined an unsafe condition exists and is likely to
exist or develop on other products of the same type design. This
proposed AD would require initial and repetitive eddy current
inspections of HP turbine discs.
Costs of Compliance
Based on the service information, we estimate that this proposed AD
would affect about three Tay 651-54 engines installed on airplanes of
U.S. registry. We also estimate that it would take about three work-
hours per engine to comply with this proposed AD. The average labor
rate is $85 per work-hour. Required parts would cost about $40,000 per
engine. Based on these
[[Page 24827]]
figures, we estimate the cost of the proposed AD on U.S. operators to
be $120,765.
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 proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would 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 proposed
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 regulatory evaluation of the estimated costs to
comply with this proposed AD and placed it in the AD docket.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
The Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
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]
2. The FAA amends Sec. 39.13 by adding the following new AD:
Rolls-Royce Deutschland Ltd & Co KG (RRD) (formerly Rolls-Royce plc,
Derby, England): Docket No. FAA-2007-0037; Directorate Identifier
2007-NE-41-AD.
Comments Due Date
(a) We must receive comments by June 21, 2010.
Affected Airworthiness Directives (ADs)
Affected ADs
(b) This AD supersedes AD 2009-22-01, Amendment 39-16052.
Applicability
(c) This AD applies to:
(1) RRD model Tay 650-15 turbofan engines that have a serial
number listed in Table 1, Table 2, or Table 3 of this AD;
(2) All model Tay 651-54 turbofan engines; and
(3) Engines with a low-pressure (LP) turbine module M05300AA
installed.
These engines are installed on, but not limited to, Fokker F.28 Mark
0070 and 0100 airplanes, Boeing 727 airplanes modified in accordance
with Supplemental Type Certificate No. SA8472SW, and Gulfstream G-IV
airplanes.
Table 1--Affected Tay 650-15 Engines by Serial Number (Carried Forward
From AD 2008-10-14 and AD 2009-22-01)
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Engine serial number
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17251 17561
17255 17562
17256 17563
17273 17580
17275 17581
17280 17612
17281 17618
17282 17635
17300 17637
17301 17645
17327 17661
17332 17686
17365 17699
17393 17701
17437 17702
17443 17736
17470 17737
17520 17738
17521 17739
17523 17741
17539 17742
17542 17808
17556 ...................................
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Table 2--Affected Tay 650-15 Engines by Serial Number (Carried Forward
From AD 2009-22-01)
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Engine serial number
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17249 17522
17303 17534
17358 17535
17370 17536
17425 17538
17426 17540
17433 17541
17438 17552
17445 17553
17446 17585
17460 17613
17474 17723
17478 17724
17490 17740
17491 17759
17517 17760
17518 17807
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Table 3--Affected Tay 650-15 Engines by Serial Number (Added New in This
AD)
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Engine serial number
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17344 17707
17360 17716
17376 17718
17413 17719
17537 17731
17694 17756
17698 17757
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Reason
(d) Strip results from some of the engines listed in the
applicability section of this AD revealed excessively corroded low-
pressure turbine disks stage 2 and stage 3. The corrosion is
considered to be caused by the environment in which these engines
are operated. Following a life assessment based on the strip
findings it is concluded that inspections for corrosion attack are
required. The action specified by this European Aviation Safety
Agency (EASA) AD 2008-0122 was intended to avoid a failure of a low-
pressure turbine disk stage 2 or stage 3 due to potential corrosion
problems which could result in uncontained engine failure and damage
to the airplane. It has been later realized that the same unsafe
condition could potentially occur on more serial numbers for the Tay
650-15 engines and on the Tay 651-54 engines. This AD, superseding
EASA AD 2008-0122, retaining its requirements, is therefore issued
to expand the Applicability in adding further engine serial numbers
for the Tay 650-15 engines and in adding the Tay 651-54 engines. We
are issuing this AD to detect corrosion that could cause the stage 2
or stage 3 disk of the LP turbine to fail and result in an
uncontained failure of the engine.
Actions and Compliance
(e) Unless already done, do the following actions.
(1) Prior to accumulating 11,700 flight cycles (FC) since new of
disk life, and
[[Page 24828]]
thereafter at intervals not exceeding 11,700 FC of disk life,
inspect the LP turbine disks stage 2 and stage 3 for corrosion using
RRD Alert Service Bulletin (ASB) No. TAY-72-A1524, Revision 3, dated
March 24, 2010.
(2) For engines with disk life that already exceed 11,700 FC on
the effective date of this AD, perform the inspection within 90 days
after the effective date of this AD.
(3) When, during any of the inspections as required by
paragraphs (e)(1) and (e)(2) of this AD, corrosion is found, replace
the affected parts. RRD TAY 650 Engine Manual--E-TAY-3RR, Tasks 72-
52-23-200-000 and 72-52-24-200-000, and RRD TAY 651 Engine Manual--
E-TAY-5RR, Tasks 72-52-23-200-000 and 72-52-24-200-000, contain
guidance on performing the inspection for corrosion and rejection
criteria.
Previous Credit
(f) Initial inspections done before the effective date of this
AD on LP turbine disks stage 2 and stage 3 listed in Table 1 and
Table 2 of this AD using RRD ASB No. TAY-72-A1524, Revision 1, dated
September 1, 2006, or Revision 2, dated June 13, 2008, comply with
the initial inspection requirements specified in this AD.
Alternative Methods of Compliance (AMOCs)
(g) 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 EASA AD 2010-060R1, dated April 14, 2010, for
related information. Contact Rolls-Royce Deutschland Ltd & Co KG,
Eschenweg 11, Dahlwitz, 15827 Blankenfelde-Mahlow, Germany; phone:
011 49 (0) 33-7086-1883; fax: 011 49 (0) 33-7086-3276, for a copy of
the service information referenced in this AD.
(i) Contact Tara Chaidez, Aerospace Engineer, Engine
Certification Office, FAA, Engine and Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; e-mail:
[email protected]; phone: (781) 238-7773; fax (781) 238-7199, for
more information about this AD.
Issued in Burlington, Massachusetts, on April 29, 2010.
Peter A. White,
Assistant Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 2010-10739 Filed 5-5-10; 8:45 am]
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