[Federal Register: May 23, 2006 (Volume 71, Number 99)]
[Rules and Regulations]
[Page 29586-29588]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr23my06-8]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 2003-NE-12-AD; Amendment 39-14609; AD 2006-11-05]
RIN 2120-AA64
Airworthiness Directives; Rolls-Royce plc RB211 Series Turbofan
Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is superseding an existing airworthiness directive
(AD) for Rolls-Royce plc (RR) RB211-22B series, RB211-524B, -524C2, -
524D4, -524G2, -524G3, and -524H series, and RB211-535C and -535E
series turbofan engines with high pressure compressor (HPC) stage 3
disc assemblies, part numbers (P/Ns) LK46210, LK58278, LK67634,
LK76036, UL11706, UL15358, UL22577, UL22578, and UL24738 installed.
This AD requires removing from service certain disc assemblies before
they reach their full published life if not modified with anticorrosion
protection. This AD results from the manufacturer's reassessment of the
corrosion risk on HPC stage 3 disc assemblies that have not yet been
modified with sufficient application of anticorrosion protection. We
are issuing this AD to prevent corrosion-induced uncontained disc
failure, resulting in damage to the airplane.
DATES: This AD becomes effective June 27, 2006. The Director of the
Federal Register previously approved the incorporation by reference of
certain publications listed in the regulations as of February 24, 2004
(69 FR 2661, January 20, 2004).
ADDRESSES: You can get the service information identified in this AD
from Rolls-Royce plc, P.O. Box 31, Derby, England, DE248BJ; telephone:
011-44-1332-242424; fax: 011-44-1332-245-418.
You may examine the AD docket at the FAA, New England Region,
Office of the Regional Counsel, 12 New England Executive Park,
Burlington, MA. You may examine the service information, at the FAA,
New England Region, Office of the Regional Counsel, 12 New England
Executive Park, Burlington, MA.
FOR FURTHER INFORMATION CONTACT: Ian Dargin, Aerospace Engineer, Engine
Certification Office, FAA, Engine and Propeller Directorate, 12 New
England Executive Park; Burlington, MA 01803; telephone (781) 238-7178;
fax (781) 238-7199.
SUPPLEMENTARY INFORMATION: We proposed to amend 14 CFR Part 39 with a
proposed AD. The proposed AD applies to RR RB211-22B series, RB211-
524B, -524C2, -524D4, -524G2, -524G3, and -524H series, and RB211-535C
and -535E series turbofan engines with HPC stage 3 disc assemblies, P/
Ns LK46210, LK58278, LK67634, LK76036, UL11706, UL15358, UL22577,
UL22578, and UL24738 installed. We published the proposed AD in the
Federal Register on July 28, 2005 (70 FR 43659). That action proposed
to require removing from service certain disc assemblies before they
reach their full published life if not modified with anticorrosion
protection.
Examining the AD Docket
You may examine the AD Docket (including any comments and service
information), by appointment, between 8 a.m. and 4:30 p.m., Monday
through Friday, except Federal holidays. See ADDRESSES for the
location.
Comments
We provided the public the opportunity to participate in the
development of this AD. We received no comments on the proposal or on
the determination of the cost to the public.
Conclusion
We have carefully reviewed the available data and determined that
air safety and the public interest require adopting the AD as proposed.
Costs of Compliance
We estimate that this AD will affect 1,000 engines installed on
airplanes of U.S. registry. We also estimate that it will take about 31
workhours per engine to perform the actions, and that the average labor
rate is $65 per workhour. Required parts will cost about $38,000 per
engine. Based on these figures, we estimate the total cost of the AD to
U.S. operators to be $40,015,000.
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 this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866;
(2) Is not a ``significant rule'' under 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. 2003-NE-12-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
Accordingly, under the authority delegated to me by the Administrator,
the Federal Aviation Administration 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 removing Amendment 39-13434 (69 FR
[[Page 29587]]
2661, January 20, 2004) and by adding a new airworthiness directive,
Amendment 39-14609, to read as follows:
2006-11-05 Rolls-Royce plc: Amendment 39-14609. Docket No. 2003-NE-
12-AD.
Effective Date
(a) This AD becomes effective June 27, 2006.
Affected ADs
(b) This AD supersedes AD 2004-01-20.
Applicability
(c) This AD applies to Rolls-Royce plc (RR) RB211-22B series,
RB211-524B, -524C2, -524D4, -524G2, -524G3, and -524H series, and
RB211-535C and -535E series turbofan engines with high pressure
compressor (HPC) stage 3 disc assemblies, part numbers (P/Ns)
LK46210, LK58278, LK67634, LK76036, UL11706, UL15358, UL22577,
UL22578, and UL24738 installed. These engines are installed on, but
not limited to, Boeing 747, Boeing 757, Boeing 767, Lockheed L-1011,
and Tupolev Tu204 series airplanes.
Unsafe Condition
(d) This AD results from the manufacturer's reassessment of the
corrosion risk on HPC stage 3 disc assemblies that have not yet been
modified with sufficient application of anticorrosion protection.
The actions specified in this AD are intended to prevent corrosion-
induced uncontained disc failure, resulting in 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.
Removal of HPC Stage 3 Discs
(f) Remove from service affected HPC stage 3 disc assemblies
identified in the following Table 1, using one of the following
criteria:
Table 1.--Affected HPC Stage 3 Disc Assemblies
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Rework band for
Rework band for cyclic life
cyclic life Rework band for accumulated on P/Ns
accumulated on disc cyclic life LK76036, UL11706,
Engine model assemblies P/Ns accumulated on disc UL15358, UL22577,
LK46210 and LK58278 assembly P/N LK67634 UL22578, and UL24738
(pre RR service (pre RR SB No. disc assemblies (pre
bulletin (SB) No. RB.211-72-5420) RR SB No. RB.211-72-
RB.211-72-5420) 9434)
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-22B series................................... 4,000-6,200 7,000-10,000 11,500-14,000
-535E4 series................................. N/A N/A 9,000-15,000
-524B-02, B-B-02, B3-02, and B4 series, Pre SB 4,000-6,000 7,000-9,000 11,500-14,000
No. 72-7730..................................
-524B2 and C2 series, Pre SB No. 72-7730...... 4,000-6,000 7,000-9,000 11,500-14,000
-524B2-B-19 and C2-B-19, SB No. 72-7730....... 4,000-6,000 7,000-9,000 8,500-11,000
-524D4 series, Pre SB No. 72-7730............. 4,000-6,000 7,000-9,000 11,500-14,000
-524D4-B series, SB No. 72-7730............... 4,000-6,000 7,000-9,000 8,500-11,000
-524G2, G3, H, and H2 series.................. 4,000-6,000 7,000-9,000 8,500-11,000
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(1) For discs that entered into service before 1990, remove disc
and rework as specified in paragraph (g)(2) of this AD, on or before
January 4, 2007, but not to exceed the upper cyclic limit in Table 1
of this AD before rework. Discs reworked may not exceed the
manufacturer's published cyclic limit in the time limits section of
the manual.
(2) For discs that entered into service in 1990 or later, remove
disc within the cyclic life rework bands in Table 1 of this AD, or
within 17 years after the date of the disc assembly entering into
service, whichever is sooner, but not to exceed the upper cyclic
limit of Table 1 of this AD before rework. Discs reworked may not
exceed the manufacturer's published cyclic limit in the time limits
section of the manual.
(3) For disc assemblies that when new, were modified with an
application of anticorrosion protection and re-marked to P/N LK76036
(not previously machined) as specified by Part 1 of the original
issue of RR service bulletin (SB) No. RB.211-72-5420, dated April
20, 1979, remove RB211-22B disc assemblies before accumulating
10,000 cycles-in-service (CIS), and remove RB211-524 disc assemblies
before accumulating 9,000 CIS.
(4) If the disc assembly date of entry into service cannot be
determined, the date of disc manufacture may be obtained from RR and
used instead.
(5) Discs in RB211-535C operation are unaffected by the interim
rework cyclic band limits in Table 1 of this AD, but must meet the
calendar life requirements of either paragraph (f)(1) or (f)(2) of
this AD, as applicable.
Optional Rework of HPC Stage 3 Discs
(g) Rework HPC stage 3 disc assemblies that were removed in
paragraph (f) of this AD as follows:
(1) For disc assemblies that when new, were modified with an
application of anticorrosion protection and re-marked to P/N LK76036
(not previously machined) as specified by Part 1 of the original
issue of RR SB RB.211-72-5420, dated April 20, 1979, rework disc
assemblies and re-mark to either LK76034 or LK78814 using paragraph
2.B. of the Accomplishment Instructions of RR SB No. RB.211-72-5420,
Revision 4, dated February 29, 1980. This rework constitutes
terminating action to the removal requirements in paragraph (f) of
this AD.
(2) For all other disc assemblies, rework using Paragraph 3.B.
of the Accomplishment Instructions of RR SB No. RB.211-72-9434,
Revision 4, dated January 12, 2000. This rework constitutes
terminating action to the removal requirements in paragraph (f) of
this AD.
Note 1: If rework is done on disc assemblies that are removed
before the disc assembly reaches the lower life of the cyclic life
rework band in Table 1 of this AD, artificial aging of the disc to
the lower life of the rework band, at time of rework, is required.
Alternative Methods of Compliance
(h) 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
(i) Civil Aviation Authority airworthiness directive 004-01-94,
dated January 4, 2002, and RR Mandatory Service Bulletin No. RB.211-
72-9661, Revision 4, dated January 4, 2002, pertain to the subject
of this AD.
Material Incorporated by Reference
(j) You must use Rolls-Royce plc Service Bulletin No. RB.211-72-
5420, Revision 4, dated February 29, 1980, and Rolls-Royce plc
Service Bulletin No. RB.211-72-9434, Revision 4, dated January 12,
2000, to perform the rework required by this AD. The Director of the
Federal Register previously approved the incorporation by reference
of these service bulletins in accordance with 5 U.S.C. 552(a) and 1
CFR part 51, as of February 24, 2004 (69 FR 2661, January 20, 2004).
You can get copies from Rolls-Royce plc, PO Box 31, Derby, England,
DE248BJ; telephone: 011-44-1332-242424; fax: 011-44-1332-245-418.
You can review copies at the FAA, New England Region, Office of the
Regional Counsel, 12 New England Executive Park, Burlington, MA; or
at the National Archives and Records Administration (NARA). For
information on the availability of this material at NARA, call 202-
741-6030,
[[Page 29588]]
or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html
.
Issued in Burlington, Massachusetts, on May 15, 2006.
Rober J. Ganley,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 06-4713 Filed 5-22-06; 8:45 am]
BILLING CODE 4910-13-P