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]
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