[Federal Register: September 8, 2006 (Volume 71, Number 174)]
[Rules and Regulations]
[Page 52988-52990]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr08se06-5]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2006-25513; Directorate Identifier 99-NE-61-AD;
Amendment 39-14753; AD 2006-18-14]
RIN 2120-AA64
Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Tay
650-15 and Tay 651-54 Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
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SUMMARY: The FAA is superseding an airworthiness directive (AD) for
Rolls-Royce Deutschland Ltd & Co KG (RRD) Tay 650-15 and Tay 651-54
turbofan engines. That AD currently establishes cyclic life limits for
certain part number (P/N) stage 1 high pressure turbine (HPT) discs and
stage 1 low pressure turbine (LPT) discs operating under certain flight
plan profiles. This AD requires calculating and re-establishing the
achieved cyclic life of stage 1 HPT discs, P/N JR32013 or P/N JR33838,
and stage 1 LPT discs, P/N JR32318A, that have been exposed to
different flight plan profiles. This AD also requires removing from
service those stage 1 HPT discs and stage 1 LPT discs operated under
Tay 650-15 engine flight plan profiles A, B, C, and D, and operated
under Tay 651-54 engine datum flight profile, at reduced cyclic life
limits, using a drawdown schedule. This AD results from RRD updating
their low-cycle-fatigue analysis for stage 1 HPT discs and stage 1 LPT
discs and reducing their cyclic life limits. We are issuing this AD to
prevent cracks leading to turbine disc failure, which could result in
an uncontained engine failure and damage to the airplane.
DATES: This AD becomes effective October 13, 2006. The Director of the
Federal Register approved the incorporation by reference of certain
publications listed in the regulations as of October 13, 2006.
ADDRESSES: You can get the service information identified in this AD
from Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, 15872
Blankenfelde-Mahlow, Germany, telephone 49-0-33-7086-1768; fax 49-0-33-
7086-3356.
You may examine the AD docket on the Internet at http://dms.dot.gov
or in Room PL-401 on the plaza level of the Nassif Building, 400
Seventh Street, SW., Washington, DC.
[[Page 52989]]
FOR FURTHER INFORMATION CONTACT: Jason Yang, Aerospace Engineer, Engine
Certification Office, FAA, Engine and Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; telephone (781) 238-7747,
fax (781) 238-7199.
SUPPLEMENTARY INFORMATION: The FAA proposed to amend 14 CFR part 39
with a proposed AD. The proposed AD applies to RRD Tay 650-15 and Tay
651-54 turbofan engines. We published the proposed AD in the Federal
Register on May 4, 2006 (71 FR 26282). That action proposed to require
calculating and re-establishing the achieved cyclic life of stage 1 HPT
discs, P/N JR32013 or P/N JR33838, and stage 1 LPT discs, P/N JR32318A,
that have been exposed to different flight plan profiles. That action
also proposed to require removing those stage 1 HPT discs and stage 1
LPT discs at reduced cyclic life limits, using a drawdown schedule.
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.
Comments
We provided the public the opportunity to participate in the
development of this AD. We have considered the comment received.
Request for Clarification of Flight Plan Profiles
RRD requests we clarify that engine flight plan profiles A, B, C,
and D, apply to Tay 650-15 engines, and that an engine datum flight
profile applies to Tay 651-54 engines. We agree and clarified the
profiles in the Summary paragraph of this AD. It now reads ``This AD
requires calculating and re-establishing the achieved cyclic life of
stage 1 HPT discs, P/N JR32013 or P/N JR33838, and stage 1 LPT discs,
P/N JR32318A, that have been exposed to different engine flight plan
profiles. This AD also requires removing from service those stage 1 HPT
discs and stage 1 LPT discs operated under Tay 650-15 engine flight
plan profiles A, B, C, and D, and operated under Tay 651-54 engine
datum flight profile, at reduced cyclic life limits, using a drawdown
schedule''. We also clarified the references to the flight plan
profiles and engine datum flight profile in the compliance section.
Change in Compliance Time
In the Notice of Proposed Rulemaking, we required initial
compliance with the proposed rule on or before August 31, 2006. Because
that date has past, we have changed the initial compliance date
requirement to start after the effective date of this AD.
Docket Number Change
We are transferring the docket for this AD to the Docket Management
System as part of our on-going docket management consolidation efforts.
The new Docket No. is FAA-2006-25513. The old Docket No. became the
Directorate Identifier, which is 99-NE-61-AD. This final rule might get
logged into the DMS docket, ahead of the proposed AD and comments
received, as we are in the process of sending those items to the DMS.
Conclusion
We have carefully reviewed the available data, including the
comment received, and determined that air safety and the public
interest require adopting the AD with the changes described previously.
We have determined that these changes will neither increase the
economic burden on any operator nor increase the scope of the AD.
Costs of Compliance
We estimate that this AD will affect 50 Tay 650-15 and Tay 651-54
turbofan engines installed on airplanes of U.S. registry. We also
estimate that it will take about one work-hour per engine to calculate
and re-establish the achieved cyclic life for a disc, and that the
average labor rate is $80 per work-hour. We estimate that the prorated
cost of the life reduction per engine will be $15,000. Based on these
figures, we estimate that if all of the engines required calculating
and re-establishing achieved cyclic life, the total cost of the AD to
U.S. operators will be $752,000.
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 at the
address listed under ADDRESSES.
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 adding the following new airworthiness
directive:
2006-18-14 [fxsp0]Rolls-Royce Deutschland Ltd & Co KG (formerly
Rolls-Royce plc): Amendment 39-14753. Docket No. FAA-2006-25513;
Directorate Identifier 99-NE-61-AD.
[[Page 52990]]
Effective Date
(a) This airworthiness directive (AD) becomes effective October
13, 2006.
Affected ADs
(b) This AD supersedes AD 2000-08-01, Amendment 39-11687.
Applicability
(c) This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD)
Tay 650-15 and Tay 651-54 turbofan engines with stage 1 high
pressure turbine (HPT) discs, part number (P/N) JR32013 or P/N
JR33838, and stage 1 low pressure turbine (LPT) discs, P/N JR32318A,
installed. These engines are installed on, but not limited to,
Fokker Model F.28 Mark 0100, and Boeing 727-100 series airplanes
modified in accordance with Supplemental Type Certificate (STC)
SA8472SW (727-QF).
Unsafe Condition
(d) This AD results from RRD updating their low-cycle-fatigue
analysis for stage 1 HPT discs and stage 1 LPT discs and reducing
their cyclic life limits. We are issuing this AD to prevent cracks
leading to turbine disc failure, which could result in an
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.
(f) Information on the referenced Tay 650-15 engine flight plan
profiles A, B, C, and D and Tay 651-54 engine datum flight profile,
can be found in RRD Tay Engine Manual, Section 70-01-10.
Calculating and Re-Establishing Within 30 Days, the Achieved Cyclic
Life of a Stage 1 HPT Disc or Stage 1 LPT Disc Previously Exposed to
Different Flight Plan Profiles
(g) If a stage 1 HPT disc or stage 1 LPT disc was previously
exposed to flight plan profile(s) different than the currently
operated flight plan:
(1) You must calculate and re-establish the achieved cyclic life
for that disc, within 30 days after the effective date of this AD.
(2) Use paragraphs 3.A. through 3.D.(2)(c) of Accomplishment
Instructions of RRD Alert Service Bulletin (ASB) No. Tay-72-A1676,
Revision 1, dated August 16, 2005, to calculate and re-establish the
achieved cyclic life.
After an Engine Flight Plan Profile Changeover, Calculating and Re-
Establishing Within 30 Days, the Achieved Cyclic Life of Stage 1 HPT
Discs and Stage 1 LPT Discs
(h) After an engine has a flight plan profile changeover:
(1) You must calculate and re-establish the achieved cyclic life
for the stage 1 HPT disc and stage 1 LPT disc, within 30 days after
the flight plan changeover.
(2) Use paragraphs 3.A. through 3.D.(2)(c) of Accomplishment
Instructions of RRD ASB No. Tay-72-A1676, Revision 1, dated August
16, 2005, to calculate and re-establish the achieved cyclic life.
Removal of Stage 1 HPT Discs and Stage 1 LPT Discs From Service Tay
650-15 Engine Flight Plan Profile A
(i) Remove from service Tay 650-15 stage 1 HPT discs and stage 1
LPT discs operated under flight plan profile A, before accumulating
23,000 cycles-since-new (CSN), and replace with serviceable parts.
Tay 650-15 Engine Flight Plan Profile B
(j) Remove from service Tay 650-15 stage 1 HPT discs operated
under flight plan profile B and replace with serviceable parts:
(1) On or before July 31, 2007, before accumulating 21,000 CSN;
and
(2) After July 31, 2007, before accumulating 20,000 CSN.
(k) Remove from service Tay 650-15 stage 1 LPT discs operated
under flight plan profile B, before accumulating 21,000 CSN, and
replace with serviceable parts.
Tay 650-15 Engine Flight Plan Profile C
(l) Remove from service Tay 650-15 stage 1 HPT discs operated
under flight plan profile C and replace with serviceable parts:
(1) After the effective date of this AD, before accumulating
15,800 CSN; and
(2) After July 31, 2007, before accumulating 14,700 CSN.
(m) Remove from service Tay 650-15 stage 1 LPT discs operated
under flight plan profile C, before accumulating 18,000 CSN, and
replace with serviceable parts.
Tay 650-15 Engine Flight Plan Profile D
(n) Remove from service Tay 650-15 stage 1 HPT discs operated
under flight plan profile D and replace with serviceable parts after
the effective date of this AD, before accumulating 11,000 CSN.
(o) Remove from service Tay 650-15 stage 1 LPT discs operated
under flight plan profile D, before accumulating 14,250 CSN, and
replace with serviceable parts.
Tay 651-54 Engine Datum Flight Profile
(p) Remove from service Tay 651-54 stage 1 HPT discs operated
under the engine datum flight profile, and replace with serviceable
parts after the effective date of this AD, before accumulating
12,600 CSN.
(q) Remove from service Tay 651-54 stage 1 LPT discs before
accumulating 20,000 CSN and replace with serviceable parts.
Alternative Methods of Compliance
(r) The Manager, Engine Certification Office, FAA, 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
(s) Luftfahrt-Bundesamt airworthiness directive No. D-2005-
252R1, dated August 31, 2005, also addresses the subject of this AD.
Material Incorporated by Reference
(t) You must use Rolls-Royce Deutschland Ltd & Co KG Alert
Service Bulletin No. Tay-72-A1676, Revision 1, dated August 16,
2005, to perform the actions 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. You can get a copy from Rolls-Royce Deutschland Ltd & Co KG,
Eschenweg 11, 15872 Blankenfelde-Mahlow, Germany, telephone 49-0-33-
7086-1768; fax 49-0-33-7086-3356. You may 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, or go to: http://www.archives.gov/
[fxsp0]federal-register/cfr/[fxsp0]ibr-
locations.html.
Issued in Burlington, Massachusetts, on August 30, 2006.
Francis A. Favara,
Manager, Engine and Propeller Directorate, Aircraft Certification
Service.
[FR Doc. E6-14685 Filed 9-7-06; 8:45 am]
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