[Federal Register Volume 77, Number 143 (Wednesday, July 25, 2012)]
[Proposed Rules]
[Pages 43550-43552]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-18155]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2012-0520; Directorate Identifier 2002-NE-43-AD]
RIN 2120-AA64
Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: We propose to supersede an existing airworthiness directive
(AD) that applies to all Turbomeca S.A. Arriel 1A, 1A1, 1A2, 1B, 1C,
1C1, 1C2, 1D, 1D1, 1E, 1E2, 1K, 1K1, 1S, and 1S1 turboshaft engines.
The existing AD currently requires initial and repetitive visual
inspections for erosion caused by dust ingestion and, if necessary,
cleaning of the gas generator (module M03). Since we issued that AD,
in-service experience has shown that dust inside the gas generator
hollow shaft may be found when the axial compressor wheel has less
erosion than initially assessed. This proposed AD would require
determining the engine history, a one-time visual inspection of the
axial compressor for erosion, initial and repetitive cleaning of the
gas generator hollow shaft, and replacement of the rear bearing if the
amount of dust collected during cleaning exceeds 8 grams. This proposed
AD also includes an optional terminating action. We are proposing this
AD to prevent an unbalance of the gas generator rotating assembly,
which may lead to gas generator rear bearing failure, and uncommanded
engine shutdown.
DATES: We must receive comments on this proposed AD by September 24,
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 http://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 AD, contact Turbomeca
S.A., 40220 Tarnos, France; phone: 33 05 59 74 40 00; fax: 33 05 59 74
45 15. 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 http://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: Rose Len, Aerospace Engineer, Engine
Certification Office, FAA, Engine & Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; phone: 781-238-7772; fax:
781-238-7199; email: [email protected].
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send any written relevant data, views, or
arguments about this proposed AD. Send your comments to an address
listed under the ADDRESSES section. Include ``Docket No. FAA-2012-0520;
Directorate Identifier 2002-NE-43-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
[[Page 43551]]
closing date and may amend this proposed AD because of those comments.
We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive about this proposed AD.
Discussion
On June 13, 2003, we issued AD 2003-12-14, Amendment 39-13199 (68
FR 36900, June 20, 2003), for all Turbomeca S.A. Arriel 1A, 1A1, 1A2,
1B, 1C, 1C1, 1C2, 1D, 1D1, 1E, 1E2, 1K, 1K1, 1S, and 1S1 turboshaft
engines. That AD requires initial and repetitive visual inspections for
ingestive erosion and, if necessary, cleaning of the module M03. That
AD resulted from reports from the manufacturer of an unbalance due to
accumulation of dust in the gas generator hollow shaft. We issued that
AD to prevent an unbalance of the gas generator rotating assembly,
which may lead to deterioration of the gas generator rear bearing and
uncommanded engine shutdown.
Actions Since Existing AD Was Issued
Since we issued AD 2003-12-14, Amendment 39-13199 (68 FR 36900,
June 20, 2003), in-service experience has shown that dust inside the
gas generator hollow shaft may be found when the axial compressor wheel
has less erosion than initially assessed. Also, since we issued that
AD, Turbomeca S.A. has developed an improvement of the gas generator
hollow shaft (Modification TU360), which makes the engine less
susceptible to dust ingestion. This proposed AD would have optional
terminating action to the inspections and cleaning, by the
incorporation of Modification TU360. Also, since we issued AD 2003-12-
14, the European Aviation Safety Agency (EASA) issued AD 2012-0071,
dated April 26, 2012, to address the conditions and improvements just
described in the European Community. This proposed AD would remove
Turbomeca S.A. Arriel 1E and 1K turboshaft engines from the
applicability section of the AD. The 1E engine is no longer in service.
The 1K engine is not an FAA validated engine and was incorrectly
included in AD 2003-12-14.
Relevant Service Information
We reviewed Turbomeca S.A. Alert Mandatory Service Bulletin (MSB)
No. A292 72 0230, Version C, dated February 29, 2012. The Alert MSB
describes procedures for the determination of the engine history, a
one-time visual inspection of the axial compressor for erosion, to
define the initial cleaning of the gas generator hollow shaft, and the
interval for repetitive cleaning of the shaft. The referenced service
bulletin also describes the criteria for replacement of the rear
bearing if dust is found.
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 the following:
Determining the engine history; and
Performing a one-time visual inspection of the axial
compressor for erosion, and initial and repetitive cleaning of the gas
generator hollow shaft; and
Replacing the gas generator rear bearing before further
flight if the dust collected during any cleaning inside the gas
generator hollow shaft exceeds 8 grams; and
If there are any changes in accordance with paragraph
1.A.(1)(a)1.3 of Turbomeca S.A. Alert MSB No. A292 72 0230, Version C,
dated February 29, 2012, within 50 engine hours time-in-service after
such a change, accomplish the actions required by this AD; and
After the effective date of the AD, do not install a
module M03 on an engine unless it is in compliance with the
requirements in this proposed AD.
Costs of Compliance
We estimate that this proposed AD would affect about 1,421 engines
installed on helicopters of U.S. registry. We also estimate that it
would take about 24 work-hours per engine to inspect and clean the gas
generator module. The average labor rate is $85 per work-hour. A
replacement gas generator rear bearing would cost about $4,128 per
engine and take about 8 work-hours to replace. Based on these figures,
we estimate the cost of the proposed AD on U.S. operators to be
$2,898,840.
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 proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not
have a substantial direct effect on the States, on the relationship
between the national Government and the States, or on the distribution
of power and responsibilities among the various levels of government.
For the reasons discussed above, I certify that the 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 removing airworthiness directive
(AD) 2003-12-14, Amendment 39-13199 (68 FR 36900, June 20, 2003), and
adding the following new AD:
Turbomeca S.A.: Docket No. FAA-2012-0520; Directorate Identifier
2002-NE-43-AD.
[[Page 43552]]
(a) Comments Due Date
The FAA must receive comments on this AD action by September 24,
2012.
(b) Affected ADs
This AD supersedes AD 2003-12-14, Amendment 39-13199 (68 FR
36900, June 20, 2003).
(c) Applicability
This AD applies to all Turbomeca S.A. Arriel 1A, 1A1, 1A2, 1B,
1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines that
have not incorporated Turbomeca S.A. Modification TU360.
(d) Unsafe Condition
This AD was prompted by in-service experience showing that dust
inside the gas generator hollow shaft may be found when the axial
compressor wheel has less erosion than initially assessed. We are
issuing this AD to prevent an unbalance of the gas generator
rotating assembly, which may lead to deterioration of the gas
generator rear bearing and uncommanded engine shutdown.
(e) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(1) Within 50 engine hours after the effective date of this AD,
determine the engine history and perform the maintenance actions at
the specified schedules. Use paragraphs 1.A. and 2.A. through 2.C.
of Turbomeca S.A. Alert Mandatory Service Bulletin (MSB) No. A292 72
0230 Version C, dated February 29, 2012 to perform the maintenance
actions and to establish the cleaning schedule.
(2) If during any of the cleanings, the dust weight collected
inside the gas generator hollow shaft is more than 8 grams, replace
the gas generator rear bearing before further flight.
(3) After the effective date of this AD, if there are any
changes in accordance with paragraph 1.A.(1)(a)1.3 of Turbomeca S.A.
Alert MSB No. A292 72 0230, Version C, dated February 29, 2012,
within 50 engine hours time-in-service after such a change,
accomplish the actions as specified in paragraph (e)(1) and (e)(2)
in this AD.
(4) After the effective date of this AD, do not install any gas
generator (module M03) on an engine unless it is in compliance with
this AD.
(5) After the effective date of this AD, do not install any gas
generator rear bearing that has operated on an engine with a hollow
shaft that has been found to have a dust weight more than 8 grams.
(f) Optional Terminating Action
As optional terminating action to the repetitive actions in this
AD, modify the engine by incorporating Turbomeca S.A. Modification
TU360.
(g) 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.
(h) Related Information
(1) For more information about this AD, contact Rose Len,
Aerospace Engineer, Engine Certification Office, FAA, Engine &
Propeller Directorate, 12 New England Executive Park, Burlington, MA
01803; phone: 781-238-7772; fax: 781-238-7199; email:
[email protected].
(2) Refer to European Aviation Safety Agency AD 2012-0071, dated
April 26, 2012, and Turbomeca S.A. Alert MSB No. A292 72 0230,
Version C, dated February 29, 2012, for related information.
(3) For service information identified in this AD, contact
Turbomeca S.A., 40220 Tarnos, France; phone: 33 05 59 74 40 00; fax:
33 05 59 74 45 15. 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 July 20, 2012.
Peter A. White,
Manager, Engine & Propeller Directorate, Aircraft Certification
Service.
[FR Doc. 2012-18155 Filed 7-24-12; 8:45 am]
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