[Federal Register: September 7, 2007 (Volume 72, Number 173)]
[Proposed Rules]
[Page 51384-51386]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr07se07-22]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2007-29001; Directorate Identifier 2007-NE-36-AD]
RIN 2120-AA64
Airworthiness Directives; General Electric Company CF34-8C1/-8C5/
-8C5B1/-8E5/-8E5A1, and CF34-10E Series Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for General Electric Company (GE) CF34-8C1/-8C5/-8C5B1/-8E5/-8E5A1, and
CF34-10E series turbofan engines with certain part number (P/N) and
serial number (SN) fuel metering units (FMU) installed. This proposed
AD would require a onetime test of the FMU for a miswired (reversed
polarity) condition of the input wires to the overspeed solenoid. This
proposed AD results from the discovery of miswired FMU overspeed
solenoids in the field. We are proposing this AD to prevent the engine
from failing to shutdown as commanded during an overspeed, leading to
uncontained engine failure.
DATES: We must receive any comments on this proposed AD by November 6,
2007.
ADDRESSES: Use one of the following addresses to comment on this
proposed AD.
DOT Docket Web site: Go to http://dms.dot.gov and follow
the instructions for sending your comments electronically.
Government-wide rulemaking Web site: Go to http://www.regulations.gov
and follow the instructions for sending your
comments electronically.
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.
Fax: (202) 493-2251.
You can get the service information identified in this proposed AD
from General Electric Company via Lockheed Martin Technology Services,
10525 Chester Road, Suite C, Cincinnati, Ohio 45215; telephone (513)
672-8400; fax (513) 672-8422.
FOR FURTHER INFORMATION CONTACT: Tara Chaidez, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803; e-mail:
tara.chaidez@faa.gov; telephone (781) 238-7773; fax (781) 238-7199.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send us any written relevant data, views, or
arguments regarding this proposal. Send your comments to an address
listed under ADDRESSES. Include ``Docket No. FAA-2007-29001;
Directorate Identifier 2007-NE-36-AD'' in the subject line of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of the proposed AD. We will
consider all comments received by the closing date and may amend the
proposed AD in light of those comments.
We will post all comments we receive, without change, to http://dms.dot.gov
, including any personal information you provide. We will
also post a report summarizing each substantive verbal contact with FAA
personnel concerning this proposed AD. Using the search function of the
DOT Web site, anyone can find and read the comments in any of our
dockets, including 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) or you
may visit http://dms.dot.gov.
Examining the AD Docket
You may examine the AD docket on the Internet at http://dms.dot.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 proposed AD, the regulatory evaluation, any
[[Page 51385]]
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.
Discussion
Woodward Governor Company has discovered in the field a miswired
(reversed polarity) condition of the input wires to the overspeed
solenoid, on some FMUs. Investigation of FMU manufacturing records
shows that there is a possibility that a population of FMUs might be
miswired. If the solenoid is miswired, the engine will fail to shut
down as commanded. This condition, if not corrected, could result in
failure of the engine to shutdown as commanded during an overspeed,
leading to uncontained engine failure.
Relevant Service Information
We have reviewed and approved the technical contents of GE Service
Bulletin (SB) No. CF34-8C-AL S/B 73-0030, Revision 1, dated July 19,
2007, SB No. CF34-8E-AL S/B 73-0015, Revision 1, dated July 19, 2007,
and SB No. CF34-10E S/B 72-0067, Revision 1, dated July 26, 2007 that
describe procedures for performing a onetime test of suspect FMUs for a
miswired (reversed polarity) condition of the input wires to the
overspeed solenoid.
FAA's Determination and Requirements of the Proposed AD
We have evaluated all pertinent information and identified an
unsafe condition that is likely to exist or develop on other products
of this same type design. We are proposing this AD, which would require
a onetime test of suspect FMUs for a miswired (reversed polarity)
condition of the input wires to the overspeed solenoid. The proposed AD
would require you to use the service information described previously
to perform these actions.
Costs of Compliance
We estimate that this proposed AD would affect 1,055 engines
installed on airplanes of U.S. registry. We also estimate that it would
take about 0.25 work-hour per engine to perform the proposed actions,
and that the average labor rate is $80 per work-hour. We estimate that
about 2 percent of the inspected solenoids are defective, and it will
cost about $5,000 to replace each FMU. Based on these figures, we
estimate the total cost of the proposed AD to U.S. operators to be
$180,000. Our cost estimate is exclusive of possible warranty coverage.
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 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. Would 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 proposed AD. 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, Safety.
The Proposed Amendment
Under the authority delegated to me by the Administrator, the
Federal Aviation Administration 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:
General Electric Company: Docket No. FAA-2007-29001; Directorate
Identifier 2007-NE-36-AD.
Comments Due Date
(a) The Federal Aviation Administration (FAA) must receive
comments on this airworthiness directive (AD) action by November 6,
2007.
Affected ADs
(b) None.
Applicability
(c) This AD applies to:
(1) General Electric Company (GE) CF34-8C1/-8C5/-8C5B1/-8E5/-
8E5A1 turbofan engines, with GE fuel metering unit (FMU) part number
(P/N) 4120T01P02, serial numbers (SNs) WYG94939 through WYGB4222,
and Woodward Governor FMU Vendor Identification Number (VIN) 8061-
926, SNs 11954378 through 15140071.
(2) GE CF34-10E series turbofan engines, with GE FMU P/N
2043M10P05, SNs WYGA3251 through WYGB4085, and Woodward Governor FMU
VIN 8063-884, SNs 13335695 through 15028283.
(3) CF34-8C1/-8C5/-8C5B1 turbofan engines are installed on, but
not limited to, Bombardier Inc. Model CL-600-2C10 (CRJ-700 & -701),
and CL-600-2D24/-2D15 (CRJ-900) airplanes.
(4) CF34-8E5/-8E5A1 turbofan engines are installed on, but not
limited to, Embraer ERJ 170-100/-200 series airplanes.
(5) CF34-10E series turbofan engines are installed on, but not
limited to, Embraer ERJ 190-100/-200 series airplanes.
Unsafe Condition
(d) This AD results from the discovery of miswired FMU overspeed
solenoids in the field. We are issuing this AD to prevent failure of
the engine to shutdown as commanded during an overspeed, leading to
uncontained engine failure.
Compliance
(e) You are responsible for having the actions required by this
AD performed within 2,200 flight hours after the effective date of
this AD, but not to exceed 24 months after the effective date of
this AD, unless the actions have already been done.
Onetime Test of the FMU
(f) Perform a onetime test of the FMU for a miswired (reversed
polarity) condition of the input wires to the overspeed solenoid.
(g) Use paragraph 3A of the Accomplishment Instructions of GE
Service Bulletin (SB) No. CF34-8C-AL S/B 73-0030, Revision 1, dated
July 19, 2007, SB No. CF34-8E-AL S/B 73-0015, Revision 1, dated July
19, 2007, or SB No. CF34-10E S/B 72-0067, Revision 1, dated July 26,
2007, as applicable, to do the test.
(h) If the FMU fails the test, remove the FMU.
[[Page 51386]]
Previous Credit
(i) If you performed the actions specified in paragraphs (f)
through (h) of this AD, using the inspection procedures in GE SB No.
CF34-8C-AL S/B 73-0030, dated May 25, 2007, SB No. CF34-8E-AL S/B
73-0015, dated June 1, 2007, or SB No. CF34-10E S/B 72-0067, dated
June 7, 2007, before the effective date of this AD, you have
satisfied the compliance requirements of this AD.
Reporting Requirements
(j) At the applicable time specified in paragraph (j)(4) or
(j)(5) of this AD:
(1) Submit a report of all findings (both positive and negative)
of the testing required by paragraph (f) of this AD to Customer
Support Manager, Woodward Governor Company, e-mail:
Jim.Akers@Woodward.com; telephone (815) 639-5365.
(2) The report must include date of inspection, serial number of
FMU, and results of the inspection.
(3) Under the provisions of the Paperwork Reduction Act (44
U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has
approved the information collection requirements contained in this
AD and has assigned OMB Control Number 2120-0056.
(4) If the inspection is done after the effective date of this
AD, submit the report within 10 days after the inspection.
(5) If the inspection was done before the effective date of this
AD, submit the report within 10 days after the effective date of
this AD.
Alternative Methods of Compliance
(k) The Manager, Engine Certification Office, has the authority
to approve alternative methods of compliance for this AD if
requested using the procedures found in 14 CFR 39.19.
Related Information
(l) None.
(m) Contact Tara Chaidez, Aerospace Engineer, Engine
Certification Office, FAA, Engine and Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; e-mail:
tara.chaidez@faa.gov; telephone (781) 238-7773; fax (781) 238-7199,
for more information about this AD.
Issued in Burlington, Massachusetts, on August 28, 2007.
Peter A. White,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. E7-17680 Filed 9-6-07; 8:45 am]
BILLING CODE 4910-13-P