Airworthiness Directives; Pratt & Whitney Turbofan Engines, 72353-72355 [2011-30138]
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Federal Register / Vol. 76, No. 226 / Wednesday, November 23, 2011 / Proposed Rules
72353
TABLE 1—COMPLIANCE TIMES—Continued
Airplanes
Initial inspection
Model A321 airplanes .....................
Repetitive interval
If the most recent inspection is an ultrasonic inspection done in accordance with paragraph (h) of this AD, inspect within 940 flight cycles after the most recent ultrasonic inspection.
If the most recent inspection is a detailed inspection done in accordance with paragraph (g) of this AD, inspect within 100 flight cycles
after the most recent detailed inspection.
If the most recent inspection is an ultrasonic inspection done in accordance with paragraph (h) of this AD, inspect within 630 flight cycles after the most recent ultrasonic inspection.
Within 940 flight cycles after an ultrasonic inspection.
Corrective Action
(l) If any cracking is found during any
inspection required by paragraph (k) of this
AD: Before further flight, repair or replace the
cracked MLG fitting using a method
approved by either the Manager,
International Branch, ANM–116, Transport
Airplane Directorate, FAA, or the EASA (or
its delegated agent).
Rib Bushing Modification
(m) Except for airplanes on which the
actions specified in paragraph (j)(3) have
been done: Within 60 months after May 19,
2008, modify the rib bushings of the left and
right MLG, by accomplishing all of the
applicable actions specified in the
Accomplishment Instructions of Airbus
Service Bulletin A320–57–1118, Revision 03,
dated April 23, 2007; or Revision 04, dated
June 4, 2008. Accomplishing this
modification terminates the requirements of
paragraphs (g) and (k) of this AD, and then
the requirements of paragraph (o) of this AD
must be done.
Credit for Actions Done According to
Previous Issue of Service Bulletin
(n) Modifying the lugs of the support rib
5 fitting of the left and right MLG is
acceptable for compliance with the
requirements of paragraph (m) of this AD if
done before May 19, 2008, in accordance
with one of the following service bulletins:
Airbus Service Bulletin A320–57–1118,
dated September 5, 2002; Revision 01, dated
August 28, 2003; or Revision 02, dated
August 2, 2006.
mstockstill on DSK4VPTVN1PROD with PROPOSALS
NEW REQUIREMENTS OF THIS AD
Post-Modification/Post-Repair Inspections
(o) For airplanes on which the actions
specified in paragraph (j)(1) or (j)(2) of this
AD have been done: At the later of the times
specified in paragraphs (o)(1) and (o)(2) of
this AD, do a detailed inspection for cracks
of the forward lug of each left-hand and righthand MLG support rib 5 fitting, in
accordance with Airbus Service Bulletin
A320–57A1166, dated January 12, 2011.
Repeat the inspection thereafter at intervals
not to exceed 500 flight cycles.
(1) Within 2,000 flight cycles after
accomplishing the modification specified in
paragraph (j)(1) or (m) of this AD, or the
repair specified in paragraph (j)(2) of this AD,
as applicable.
(2) Within 250 flight cycles after the
effective date of this AD, without exceeding
3 months after the effective date of this AD.
VerDate Mar<15>2010
17:29 Nov 22, 2011
Jkt 226001
Within 100 flight cycles after a visual inspection.
Within 630 flight cycles after an ultrasonic inspection.
(p) If any crack is detected during any
inspection required by paragraph (o) of this
AD: Before further flight, repair using a
method approved by either the Manager,
International Branch, ANM–116, FAA; or
EASA (or its delegated agent).
actions if they are FAA-approved. Corrective
actions are considered FAA-approved if they
are approved by the State of Design Authority
(or their delegated agent). You are required
to ensure the product is airworthy before it
is returned to service.
Optional Terminating Action
(q) Replacement of a MLG support rib 5
fitting at any position (LH or RH) as specified
in paragraph (j)(3) of this AD terminates the
requirements of this AD for the MLG support
rib 5 fitting at that position.
Related Information
(s) For related information, refer to MCAI
EASA Airworthiness Directive 2011–0011,
dated January 21, 2011; Airbus Service
Bulletin A320–57–1118, Revision 03, dated
April 23, 2007, Airbus Mandatory Service
Bulletin A320–57–1118, Revision 04, dated
June 4, 2008; Airbus Service Bulletin A320–
57–1138, Revision 01, dated October 27,
2006; Airbus A319 Structural Repair Manual
(SRM), Paragraph 5.C., 57–26–13, Revision
dated November 1, 2004; Airbus A320 SRM,
Paragraph 5.D., 57–26–13, Revision dated
November 1, 2004; Airbus A321 SRM,
Paragraph 5.D., 57–26–13, Revision dated
February 1, 2005; and Task 57–29–03–270–
801–A–01, Inspection of the Gear Rib
Forward and Aft Lug Attachment for the
Main Gear, of Chapter 57, Wings, of the
Airbus A318/A319/A320/A321
Nondestructive Testing Manual, Revision 89,
dated August 1, 2011.
FAA AD Differences
Note 2: This AD differs from the MCAI
and/or service information as follows:
Although the MCAI or service information
allows further flight after cracks are found
during compliance with certain required
actions, paragraphs (l) and (p) of this AD
require repair or replacement before further
flight.
Other FAA AD Provisions
(r) The following provisions also apply to
this AD:
(1) Alternative Methods of Compliance
(AMOCs): The Manager, International
Branch, ANM–116, FAA, has the authority to
approve AMOCs for this AD, if requested
using the procedures found in 14 CFR 39.19.
In accordance with 14 CFR 39.19, send your
request to your principal inspector or local
Flight Standards District Office, as
appropriate. If sending information directly
to the International Branch, send it to ATTN:
Sanjay Ralhan, Aerospace Engineer,
International Branch, ANM–116, Transport
Airplane Directorate, FAA, 1601 Lind
Avenue SW., Renton, Washington 98057–
3356; phone: (425) 227–1405; fax: (425) 227–
1149. Information may be emailed to:
9-ANM-116-AMOC-REQUESTS@faa.gov.
Before using any approved AMOC, notify
your appropriate principal inspector, or
lacking a principal inspector, the manager of
the local flight standards district office/
certificate holding district office. The AMOC
approval letter must specifically reference
this AD. AMOCs approved previously in
accordance with AD 2006–11–04,
Amendment 39–14608 (71 FR 29578, May 23,
2006), and AD 2008–08–04, Amendment 39–
15456 (73 FR 19975, April 14, 2008), are not
approved as AMOCs for the corresponding
provisions of this AD.
(2) Airworthy Product: For any requirement
in this AD to obtain corrective actions from
a manufacturer or other source, use these
PO 00000
Frm 00023
Fmt 4702
Sfmt 4702
Issued in Renton, Washington, on
November 14, 2011.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 2011–30223 Filed 11–22–11; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2011–1194; Directorate
Identifier 2011–NE–36–AD]
RIN 2120–AA64
Airworthiness Directives; Pratt &
Whitney Turbofan Engines
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
We propose to adopt a new
airworthiness directive (AD) for all Pratt
SUMMARY:
E:\FR\FM\23NOP1.SGM
23NOP1
72354
Federal Register / Vol. 76, No. 226 / Wednesday, November 23, 2011 / Proposed Rules
mstockstill on DSK4VPTVN1PROD with PROPOSALS
& Whitney PW4050, PW4052, PW4056,
PW4056(–3), PW4156, PW4060,
PW4060(–3), PW4060A, PW4152,
PW4152(–3), PW4156A, PW4158,
PW4158(–3), PW4460, PW4460(–3),
PW4462, and PW4462(–3) turbofan
engines. This proposed AD was
prompted by reports of five engine inflight shutdowns and seven unplanned
engine removals. This proposed AD
would require inspections, cleaning,
and engine modifications to address
coking in the No. 4 bearing
compartment and oil pressure and
scavenge tubes. We are proposing this
AD to prevent an engine fire, a fractured
fan drive shaft, and damage to the
airplane.
DATES: We must receive comments on
this proposed AD by January 23, 2012.
ADDRESSES: You may send comments,
using the procedures found in 14 CFR
11.43 and 11.45, by any of the following
methods:
• Federal eRulemaking Portal: Go to
https://www.regulations.gov. Follow the
instructions for submitting comments.
• Fax: (202) 493–2251.
• Mail: U.S. Department of
Transportation, Docket Operations,
M–30, West Building Ground Floor,
Room W12–140, 1200 New Jersey
Avenue SE., Washington, DC 20590.
• Hand Delivery: Deliver to Mail
address above between 9 a.m. and
5 p.m., Monday through Friday, except
Federal holidays.
For service information identified in
this proposed AD, contact Pratt &
Whitney, 400 Main St., East Hartford,
CT 06108; phone: (860) 565–8770; fax:
(860) 565–4503. You may review copies
of the referenced 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 https://
www.regulations.gov; 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 proposed AD, the
regulatory evaluation, any comments
received, and other information. The
street address for the Docket Office
(phone: (800) 647–5527) is in the
ADDRESSES section. Comments will be
available in the AD docket shortly after
receipt.
FOR FURTHER INFORMATION CONTACT:
Stephen Sheely, Aerospace Engineer,
Engine & Propeller Directorate, FAA, 12
New England Executive Park,
VerDate Mar<15>2010
17:29 Nov 22, 2011
Jkt 226001
Burlington, MA 01803; phone: (781)
238–7750; fax: (781) 238–7199; email:
stephen.k.sheely@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send any written
relevant data, views, or arguments about
this proposal. Send your comments to
an address listed under the ADDRESSES
section. Include ‘‘Docket No. FAA–
2011–1194; Directorate Identifier 2011–
NE–36–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 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 proposed AD.
Discussion
We received reports of five engine inflight shutdowns and seven unplanned
engine removals due to clogging of No.
4 bearing compartment oil pressure and
scavenge tubes. Investigation has
revealed that following all engine
shutdowns, excessive heat is conducting
into the No. 4 bearing compartment and
into the oil pressure and scavenge tubes
that pass through the turbine exhaust
case struts. This excessive heat causes
oil coking and oil flow restriction in the
pressure and scavenge tubes and oil
nozzle. This condition, if not corrected,
could lead to an engine fire, a fractured
fan drive shaft, and damage to the
airplane.
Relevant Service Information
We reviewed Pratt & Whitney Alert
Service Bulletin (SB) No. PW4ENG–
A72–436, Revision 6, dated September
30, 1999. The SB describes procedures
for initial and repetitive inspection and
cleaning of the No. 4 bearing
compartment. We also reviewed Pratt &
Whitney SB No. PW4ENG–72–472,
Revision 5, dated April 14, 1998, and SB
No. PW4ENG–79–76, Revision 4, dated
February 14, 2002. The SBs describe
procedures for modifications to stop
buildup of coking in the No. 4 bearing
compartment, and for rerouting of the
No. 4 bearing pressure and scavenge
tubes. The rerouted tubes are then
located below the engine centerline
which eliminates the coking problem.
PO 00000
Frm 00024
Fmt 4702
Sfmt 4702
FAA’s Determination
We are proposing this AD because we
evaluated all the relevant information
and determined the unsafe condition
described previously is likely to exist or
develop in other products of the same
type design.
Proposed AD Requirements
This proposed AD would require
accomplishing the actions specified in
the service information described
previously.
Costs of Compliance
We estimate that this proposed AD
would affect 44 Pratt & Whitney
PW4050, PW4052, PW4056, PW4056(–
3), PW4156, PW4060, PW4060(–3),
PW4060A, PW4152, PW4152(–3),
PW4156A, PW4158, PW4158(–3),
PW4460, PW4460(–3), PW4462, and
PW4462(–3) turbofan engines installed
on airplanes of U.S. registry. We also
estimate that it would take about 8
work-hours per engine to perform an
inspection and cleaning of the No. 4
bearing compartment, about 7 workhours per engine to perform the
modification to stop buildup of coking
in the No. 4 bearing compartment, and
about 33.7 work-hours per engine to
perform the rerouting of the No. 4
bearing pressure and scavenge tubes.
The average labor rate is $85 per workhour. Required parts would cost about
$69,322 per engine. Based on these
figures, we estimate the total cost of the
AD to U.S. operators to be $3,232,306.
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
E:\FR\FM\23NOP1.SGM
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Federal Register / Vol. 76, No. 226 / Wednesday, November 23, 2011 / Proposed Rules
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),
(3) Will not affect intrastate aviation
in Alaska, 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.
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.
§ 39.13
[Amended]
2. The FAA amends § 39.13 by adding
the following new airworthiness
directive (AD):
Pratt & Whitney: Docket No. FAA–2011–
1194; Directorate Identifier 2011–NE–
36–AD.
mstockstill on DSK4VPTVN1PROD with PROPOSALS
(b) Affected ADs
None.
(c) Applicability
This AD applies to all Pratt & Whitney
PW4050, PW4052, PW4056, PW4056(–3),
PW4156, PW4060, PW4060(–3), PW4060A,
PW4152, PW4152(–3), PW4156A, PW4158,
PW4158(–3), PW4460, PW4460(–3), PW4462,
and PW4462(–3) turbofan engines.
(d) Unsafe Condition
This AD was prompted by reports of five
engine in-flight shutdowns and seven
unplanned engine removals due to clogging
of No. 4 bearing compartment oil pressure
and scavenge tubes. We are issuing this AD
to prevent an engine fire, a fractured fan
drive shaft, and damage to the airplane.
17:29 Nov 22, 2011
Jkt 226001
Comply with this AD within the
compliance times specified, unless already
done.
(f) Inspection and Cleaning of No. 4 Bearing
Compartment for Coking
(1) Within 1,000 cycles-in-service (CIS)
after the effective date of this AD, initially
inspect and clean the No. 4 bearing
compartment in accordance with
Accomplishment Instructions, paragraphs
2.A. through 2.A.(4)(b)3 of Pratt & Whitney
Alert Service Bulletin No. PW4ENG–A72–
436, Revision 6, dated September 30, 1999.
(2) Thereafter, within every additional
1,000 CIS, perform the inspection and
cleaning specified in paragraph (f)(1) of this
AD.
(g) Modification To Stop Buildup of Coking
in the No. 4 Bearing Compartment
(1) At the next engine visit to a
maintenance facility that is capable of
performing the following on-wing method or
in-shop method of modification to the No. 4
bearing compartment, but not to exceed 5
years after the effective date of this AD, do
the following:
(i) Replace the No. 4 bearing packing
transfer tube assembly;
(ii) Replace the No. 4 bearing internal
scavenge tube assembly;
(iii) Remove the No. 4 bearing shield, and
the No. 4 bearing shield option; and
(iv) Install new No. 4 bearing shield
options.
(2) For doing the on-wing method of the
modification, do the work in accordance with
Accomplishment Instructions, Paragraphs
2.A. through 2.A.(9)(a)3d of Pratt & Whitney
Service Bulletin (SB) No. PW4ENG–72–472,
Revision 5, dated April 14, 1998.
(3) For doing the in-shop method of the
modification, do the work in accordance with
Paragraphs 2.B. through 2.B.(2)(f)2d of Pratt
& Whitney SB No. PW4ENG–72–472,
Revision 5, dated April 14, 1998.
(h) Rerouting of the No. 4 Bearing Pressure
and Scavenge Tubes
(a) Comments Due Date
We must receive comments by January 23,
2012.
VerDate Mar<15>2010
(e) Compliance
(1) At the next shop visit at which the
engine is sufficiently disassembled to
perform the rerouting, but not to exceed 5
years after the effective date of this AD, do
the following:
(i) Modify the turbine exhaust case to
relocate the No. 4 bearing pressure and
scavenge tube ports;
(ii) Replace the internal No. 4 bearing
pressure and scavenge tubes;
(iii) Modify or replace the turbine case
cooling brackets to support the new No. 4
bearing pressure and scavenge tubes;
(iv) Replace the turbine case manifolds as
necessary; and
(v) Install the new brackets and clamps to
support the new routing configuration.
(2) Do the work specified in paragraph (h)
of this AD in accordance with
Accomplishment Instructions paragraph 2 of
Pratt & Whitney SB No. PW4ENG–79–76,
Revision 4, dated February 14, 2002.
PO 00000
Frm 00025
Fmt 4702
Sfmt 4702
72355
(i) Terminating Action to the Repetitive
Inspections and Cleaning
Performing the modifications specified in
both paragraphs (g) and (h), of this AD is
terminating action to the repetitive
inspections and cleanings specified in
paragraph (f)(2) of this AD.
(j) Alternative Methods of Compliance
(AMOCs)
The Manager, Engine Certification Office,
may approve AMOCs for this AD. Use the
procedures found in 14 CFR 39.19 to make
your request.
(k) Related Information
(1) For more information about this AD,
contact Stephen Sheely, Aerospace Engineer,
Engine & Propeller Directorate, FAA, 12 New
England Executive Park, Burlington, MA
01803; phone: (781) 238–7750; fax: (781)
238–7199; email: stephen.k.sheely@faa.gov.
(2) For service information identified in
this AD, contact Pratt & Whitney, 400 Main
St., East Hartford, CT 06108; telephone: (860)
565–8770; fax: (860) 565–4503. You may
review copies of the referenced 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.
Issued in Burlington, Massachusetts, on
November 15, 2011.
Peter A. White,
Manager, Engine & Propeller Directorate,
Aircraft Certification Service.
[FR Doc. 2011–30138 Filed 11–22–11; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF JUSTICE
Drug Enforcement Administration
21 CFR Part 1300
[Docket No. DEA–341P]
RIN 1117–AB31
Classification of Two Steroids,
Prostanozol and Methasterone, as
Schedule III Anabolic Steroids Under
the Controlled Substances Act
Drug Enforcement
Administration (DEA), Department of
Justice.
ACTION: Notice of proposed rulemaking.
AGENCY:
This Notice of Proposed
Rulemaking (NPRM) proposes to
classify the following two steroids as
‘‘anabolic steroids’’ under the
Controlled Substances Act (CSA):
prostanozol (17b-hydroxy-5aandrostano[3,2-c]pyrazole) and
methasterone (2a,17a-dimethyl-5aandrostan-17b-ol-3-one). The Drug
Enforcement Administration (DEA)
believes that this action is necessary to
prevent the abuse and trafficking of
SUMMARY:
E:\FR\FM\23NOP1.SGM
23NOP1
]]>Agencies
[Federal Register Volume 76, Number 226 (Wednesday, November 23, 2011)]
[Proposed Rules]
[Pages 72353-72355]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2011-30138]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2011-1194; Directorate Identifier 2011-NE-36-AD]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: We propose to adopt a new airworthiness directive (AD) for all
Pratt
[[Page 72354]]
& Whitney PW4050, PW4052, PW4056, PW4056(-3), PW4156, PW4060, PW4060(-
3), PW4060A, PW4152, PW4152(-3), PW4156A, PW4158, PW4158(-3), PW4460,
PW4460(-3), PW4462, and PW4462(-3) turbofan engines. This proposed AD
was prompted by reports of five engine in-flight shutdowns and seven
unplanned engine removals. This proposed AD would require inspections,
cleaning, and engine modifications to address coking in the No. 4
bearing compartment and oil pressure and scavenge tubes. We are
proposing this AD to prevent an engine fire, a fractured fan drive
shaft, and damage to the airplane.
DATES: We must receive comments on this proposed AD by January 23,
2012.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
Fax: (202) 493-2251.
Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this proposed AD, contact
Pratt & Whitney, 400 Main St., East Hartford, CT 06108; phone: (860)
565-8770; fax: (860) 565-4503. You may review copies of the referenced
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 https://www.regulations.gov; 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 proposed AD, the regulatory
evaluation, any comments received, and other information. The street
address for the Docket Office (phone: (800) 647-5527) is in the
ADDRESSES section. Comments will be available in the AD docket shortly
after receipt.
FOR FURTHER INFORMATION CONTACT: Stephen Sheely, Aerospace Engineer,
Engine & Propeller Directorate, FAA, 12 New England Executive Park,
Burlington, MA 01803; phone: (781) 238-7750; fax: (781) 238-7199;
email: stephen.k.sheely@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include ``Docket No. FAA-2011-1194;
Directorate Identifier 2011-NE-36-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 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 proposed AD.
Discussion
We received reports of five engine in-flight shutdowns and seven
unplanned engine removals due to clogging of No. 4 bearing compartment
oil pressure and scavenge tubes. Investigation has revealed that
following all engine shutdowns, excessive heat is conducting into the
No. 4 bearing compartment and into the oil pressure and scavenge tubes
that pass through the turbine exhaust case struts. This excessive heat
causes oil coking and oil flow restriction in the pressure and scavenge
tubes and oil nozzle. This condition, if not corrected, could lead to
an engine fire, a fractured fan drive shaft, and damage to the
airplane.
Relevant Service Information
We reviewed Pratt & Whitney Alert Service Bulletin (SB) No. PW4ENG-
A72-436, Revision 6, dated September 30, 1999. The SB describes
procedures for initial and repetitive inspection and cleaning of the
No. 4 bearing compartment. We also reviewed Pratt & Whitney SB No.
PW4ENG-72-472, Revision 5, dated April 14, 1998, and SB No. PW4ENG-79-
76, Revision 4, dated February 14, 2002. The SBs describe procedures
for modifications to stop buildup of coking in the No. 4 bearing
compartment, and for rerouting of the No. 4 bearing pressure and
scavenge tubes. The rerouted tubes are then located below the engine
centerline which eliminates the coking problem.
FAA's Determination
We are proposing this AD because we evaluated all the relevant
information and determined the unsafe condition described previously is
likely to exist or develop in other products of the same type design.
Proposed AD Requirements
This proposed AD would require accomplishing the actions specified
in the service information described previously.
Costs of Compliance
We estimate that this proposed AD would affect 44 Pratt & Whitney
PW4050, PW4052, PW4056, PW4056(-3), PW4156, PW4060, PW4060(-3),
PW4060A, PW4152, PW4152(-3), PW4156A, PW4158, PW4158(-3), PW4460,
PW4460(-3), PW4462, and PW4462(-3) turbofan engines installed on
airplanes of U.S. registry. We also estimate that it would take about 8
work-hours per engine to perform an inspection and cleaning of the No.
4 bearing compartment, about 7 work-hours per engine to perform the
modification to stop buildup of coking in the No. 4 bearing
compartment, and about 33.7 work-hours per engine to perform the
rerouting of the No. 4 bearing pressure and scavenge tubes. The average
labor rate is $85 per work-hour. Required parts would cost about
$69,322 per engine. Based on these figures, we estimate the total cost
of the AD to U.S. operators to be $3,232,306.
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
[[Page 72355]]
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),
(3) Will not affect intrastate aviation in Alaska, 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.
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
airworthiness directive (AD):
Pratt & Whitney: Docket No. FAA-2011-1194; Directorate Identifier
2011-NE-36-AD.
(a) Comments Due Date
We must receive comments by January 23, 2012.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all Pratt & Whitney PW4050, PW4052, PW4056,
PW4056(-3), PW4156, PW4060, PW4060(-3), PW4060A, PW4152, PW4152(-3),
PW4156A, PW4158, PW4158(-3), PW4460, PW4460(-3), PW4462, and
PW4462(-3) turbofan engines.
(d) Unsafe Condition
This AD was prompted by reports of five engine in-flight
shutdowns and seven unplanned engine removals due to clogging of No.
4 bearing compartment oil pressure and scavenge tubes. We are
issuing this AD to prevent an engine fire, a fractured fan drive
shaft, and damage to the airplane.
(e) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(f) Inspection and Cleaning of No. 4 Bearing Compartment for Coking
(1) Within 1,000 cycles-in-service (CIS) after the effective
date of this AD, initially inspect and clean the No. 4 bearing
compartment in accordance with Accomplishment Instructions,
paragraphs 2.A. through 2.A.(4)(b)3 of Pratt & Whitney Alert Service
Bulletin No. PW4ENG-A72-436, Revision 6, dated September 30, 1999.
(2) Thereafter, within every additional 1,000 CIS, perform the
inspection and cleaning specified in paragraph (f)(1) of this AD.
(g) Modification To Stop Buildup of Coking in the No. 4 Bearing
Compartment
(1) At the next engine visit to a maintenance facility that is
capable of performing the following on-wing method or in-shop method
of modification to the No. 4 bearing compartment, but not to exceed
5 years after the effective date of this AD, do the following:
(i) Replace the No. 4 bearing packing transfer tube assembly;
(ii) Replace the No. 4 bearing internal scavenge tube assembly;
(iii) Remove the No. 4 bearing shield, and the No. 4 bearing
shield option; and
(iv) Install new No. 4 bearing shield options.
(2) For doing the on-wing method of the modification, do the
work in accordance with Accomplishment Instructions, Paragraphs 2.A.
through 2.A.(9)(a)3d of Pratt & Whitney Service Bulletin (SB) No.
PW4ENG-72-472, Revision 5, dated April 14, 1998.
(3) For doing the in-shop method of the modification, do the
work in accordance with Paragraphs 2.B. through 2.B.(2)(f)2d of
Pratt & Whitney SB No. PW4ENG-72-472, Revision 5, dated April 14,
1998.
(h) Rerouting of the No. 4 Bearing Pressure and Scavenge Tubes
(1) At the next shop visit at which the engine is sufficiently
disassembled to perform the rerouting, but not to exceed 5 years
after the effective date of this AD, do the following:
(i) Modify the turbine exhaust case to relocate the No. 4
bearing pressure and scavenge tube ports;
(ii) Replace the internal No. 4 bearing pressure and scavenge
tubes;
(iii) Modify or replace the turbine case cooling brackets to
support the new No. 4 bearing pressure and scavenge tubes;
(iv) Replace the turbine case manifolds as necessary; and
(v) Install the new brackets and clamps to support the new
routing configuration.
(2) Do the work specified in paragraph (h) of this AD in
accordance with Accomplishment Instructions paragraph 2 of Pratt &
Whitney SB No. PW4ENG-79-76, Revision 4, dated February 14, 2002.
(i) Terminating Action to the Repetitive Inspections and Cleaning
Performing the modifications specified in both paragraphs (g)
and (h), of this AD is terminating action to the repetitive
inspections and cleanings specified in paragraph (f)(2) of this AD.
(j) Alternative Methods of Compliance (AMOCs)
The Manager, Engine Certification Office, may approve AMOCs for
this AD. Use the procedures found in 14 CFR 39.19 to make your
request.
(k) Related Information
(1) For more information about this AD, contact Stephen Sheely,
Aerospace Engineer, Engine & Propeller Directorate, FAA, 12 New
England Executive Park, Burlington, MA 01803; phone: (781) 238-7750;
fax: (781) 238-7199; email: stephen.k.sheely@faa.gov.
(2) For service information identified in this AD, contact Pratt
& Whitney, 400 Main St., East Hartford, CT 06108; telephone: (860)
565-8770; fax: (860) 565-4503. You may review copies of the
referenced 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.
Issued in Burlington, Massachusetts, on November 15, 2011.
Peter A. White,
Manager, Engine & Propeller Directorate, Aircraft Certification
Service.
[FR Doc. 2011-30138 Filed 11-22-11; 8:45 am]
BILLING CODE 4910-13-P
