[Federal Register: August 16, 2007 (Volume 72, Number 158)]
[Proposed Rules]
[Page 45956-45958]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr16au07-19]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2007-28923; Directorate Identifier 2007-NM-133-AD]
RIN 2120-AA64
Airworthiness Directives; Fokker Model F28 Mark 0070 and 0100
Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: We propose to adopt a new airworthiness directive (AD) for the
products listed above. This proposed AD results from mandatory
continuing airworthiness information (MCAI) originated 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:
Over the years, several Fokker 100 (F28 Mark 0100) operators
reported that a MLG (main landing gear) wheel fell off during
regular operation of the aircraft. These incidents occurred due to a
missing spacer, which had inadvertently not been installed during a
previous wheel change. Omitting the installation of the wheel spacer
allows the wheel to move sideways along the axle, which subsequently
leads to bearing failure, followed by loss of the wheel. * * * This
condition, if not corrected, * * * could conceivably result in loss
of control of the aircraft during the take-off run, landing rollout
or taxiing operations. * * *
The proposed AD would require actions that are intended to address
the unsafe condition described in the MCAI.
DATES: We must receive comments on this proposed AD by September 17,
2007.
ADDRESSES: You may send comments by any of the following methods:
DOT Docket Web Site: Go to http:// dms.dot.gov and follow
the instructions for sending your comments electronically.
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: Room W12-140 on the ground floor of the
West Building, 1200 New Jersey Avenue, SE., Washington, DC, between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
Federal eRulemaking Portal: http://www.regulations.gov.
Follow the instructions for submitting comments.
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
comments received, and other information. The street address for the
Docket Operations office (telephone (800) 647-5527) is in the ADDRESSES
section. Comments will be available in the AD docket shortly after
receipt.
FOR FURTHER INFORMATION CONTACT: Tom Rodriguez, Aerospace Engineer,
International Branch, ANM-116, Transport Airplane Directorate, FAA,
1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425)
227-1137; fax (425) 227-1149.
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-2007-
28923; Directorate Identifier 2007-NM-133-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 based on 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 we
receive about this proposed AD.
Discussion
The Civil Aviation Authority--The Netherlands (CAA-NL), which is
the aviation authority for the Netherlands, has issued Dutch
Airworthiness Directive NL-2005-008, dated June 30, 2005 (referred to
after this as ``the MCAI''), to correct an unsafe condition for the
specified products. The MCAI states:
[[Page 45957]]
Over the years, several Fokker 100 (F28 Mark 0100) operators
reported that a MLG (main landing gear) wheel fell off during
regular operation of the aircraft. These incidents occurred due to a
missing spacer, which had inadvertently not been installed during a
previous wheel change. Omitting the installation of the wheel spacer
allows the wheel to move sideways along the axle, which subsequently
leads to bearing failure, followed by loss of the wheel.
Investigation by Fokker and Messier-Dowty has shown that two
separate items, the spacer and the axle nut, can be replaced by a
single axle-nut/spacer assembly, to prevent the possibility of
omitting the spacer. In 1995, Messier-Dowty issued Service Bulletin
(SB) F100-32-72 to make sure that the operator does not assemble the
axle nut without the spacer. Fokker subsequently issued SB F100-32-
096 to notify Fokker 100 operators of the (optional) Messier-Dowty
SB's existence. At a later stage, Fokker revised the SB to the
status of ``recommended''. In spite of all this attention to the
spacer problem, wheel losses are still being reported due to missing
wheel nut spacers. This condition, if not corrected, may lead to
further wheel loss incidents, each of which could conceivably result
in loss of control of the aircraft during the take-off run, landing
rollout or taxiing operations. Since a potentially unsafe condition
has been identified that may exist or develop on aircraft of the
same type design, this Airworthiness Directive requires the
replacement of the axle-nut and spacer with an integrated axle-nut/
spacer assembly. In addition, the Aircraft Maintenance Manual (AMM)
and Illustrated Parts Catalogue (IPC) must be amended to prevent
reversal to a separate axle-nut and spacer installation during a
subsequent wheel change.
You may obtain further information by examining the MCAI in the AD
docket.
Relevant Service Information
Messier-Dowty has issued Service Bulletin F100-32-72, Revision 1,
dated March 5, 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 Proposed AD
This product has been approved by the aviation authority of another
country, and is approved for operation in the United States. Pursuant
to our bilateral agreement with the State of Design Authority, we have
been notified of the unsafe condition described in the MCAI and service
information referenced above. We are proposing this AD because we
evaluated all pertinent information and determined an unsafe condition
exists and is likely to exist or develop on other products of the same
type design.
Differences Between This AD and the MCAI or Service Information
We have reviewed the MCAI and related service information and, in
general, agree with their substance. But we might have found it
necessary to use different words from those in the MCAI to ensure the
AD is clear for U.S. operators and is enforceable. In making these
changes, we do not intend to differ substantively from the information
provided in the MCAI and related service information.
We might also have proposed different actions in this AD from those
in the MCAI in order to follow FAA policies. Any such differences are
highlighted in a NOTE within the proposed AD.
Costs of Compliance
Based on the service information, we estimate that this proposed AD
would affect about 13 products of U.S. registry. We also estimate that
it would take about 4 work-hours per product to comply with the basic
requirements of this proposed AD. The average labor rate is $80 per
work-hour. Required parts would cost about $3,750 per product. Where
the service information lists required parts costs that are covered
under warranty, we have assumed that there will be no charge for these
costs. As we do not control warranty coverage for affected parties,
some parties may incur costs higher than estimated here. Based on these
figures, we estimate the cost of the proposed AD on U.S. operators to
be $52,910, or $4,070 per product.
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 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); 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 proposed AD and placed it in the AD docket.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, 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 AD:
Fokker Services B.V.: Docket No. FAA-2007-28923; Directorate
Identifier 2007-NM-133-AD.
Comments Due Date
(a) We must receive comments by September 17, 2007.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Fokker Model F.28 Mark 0070 and 0100
airplanes; certificated in any category; all serial numbers, if
equipped with Messier-Dowty main landing gear (MLG) units.
Subject
(d) Air Transport Association (ATA) of America Code 32: Landing
gear.
[[Page 45958]]
Reason
(e) The mandatory continuing airworthiness information (MCAI)
states:
Over the years, several Fokker 100 (F28 Mark 0100) operators
reported that a MLG (main landing gear) wheel fell off during
regular operation of the aircraft. These incidents occurred due to a
missing spacer, which had inadvertently not been installed during a
previous wheel change. Omitting the installation of the wheel spacer
allows the wheel to move sideways along the axle, which subsequently
leads to bearing failure, followed by loss of the wheel.
Investigation by Fokker and Messier-Dowty has shown that two
separate items, the spacer and the axle nut, can be replaced by a
single axle-nut/spacer assembly, to prevent the possibility of
omitting the spacer. In 1995, Messier-Dowty issued Service Bulletin
(SB) F100-32-72 to make sure that the operator does not assemble the
axle nut without the spacer. Fokker subsequently issued SB F100-32-
096 to notify Fokker 100 operators of the (optional) Messier-Dowty
SB's existence. At a later stage, Fokker revised the SB to the
status of ``recommended''. In spite of all this attention to the
spacer problem, wheel losses are still being reported due to missing
wheel nut spacers. This condition, if not corrected, may lead to
further wheel loss incidents, each of which could conceivably result
in loss of control of the aircraft during the take-off run, landing
rollout or taxiing operations. Since a potentially unsafe condition
has been identified that may exist or develop on aircraft of the
same type design, this Airworthiness Directive requires the
replacement of the axle-nut and spacer with an integrated axle-nut/
spacer assembly. In addition, the Aircraft Maintenance Manual (AMM)
and Illustrated Parts Catalogue (IPC) must be amended to prevent
reversal to a separate axle-nut and spacer installation during a
subsequent wheel change.
Actions and Compliance
(f) Unless already done, do the following actions.
(1) Within 12 months after the effective date of this AD,
replace each MLG wheel axle-nut and spacer with an integrated axle-
nut/spacer assembly in accordance with the Accomplishment
Instructions of Messier-Dowty Service Bulletin F100-32-72, Revision
1, dated March 5, 2007.
Note 1: Fokker 70/100 Service Letter 102, Revision 1, dated
February 12, 1998; and Fokker Service Bulletin SBF100-32-096,
Revision 2, dated April 29, 2005, also pertain to this subject.
(2) As of 12 months after the effective date of this AD, no
person may install an axle nut having part number (P/N) 201072670 or
alternate P/N 201072765, or any spacer having P/N 201072699, on any
airplane. Only axle nut subassemblies having P/N 201251273 or P/N
201650216 may be installed.
(3) Actions accomplished before the effective date of this AD in
accordance with Messier-Dowty Service Bulletin F100-32-72, dated
January 25, 1995, are considered acceptable for compliance with the
corresponding action specified in this AD.
FAA AD Differences
Note: This AD differs from the MCAI and/or service information
as follows:
(1) The MCAI requires revising the AMM and IPC. As these
documents are not FAA-approved, we do not require these revisions.
Therefore, this AD requires compliance with paragraph (f)(2) of this
AD, which accomplishes the intent of revising the AMM and IPC.
Other FAA AD Provisions
(g) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager,
International Branch, ANM-116, Transport Airplane Directorate, FAA,
has the authority to approve AMOCs for this AD, if requested using
the procedures found in 14 CFR 39.19. Send information to ATTN: Tom
Rodriguez, Aerospace Engineer, International Branch, ANM-116,
Transport Airplane Directorate, FAA, 1601 Lind Avenue, SW., Renton,
Washington 98057-3356; telephone (425) 227-1137; fax (425) 227-1149.
Before using any approved AMOC on any airplane to which the AMOC
applies, notify your appropriate principal inspector (PI) in the FAA
Flight Standards District Office (FSDO), or lacking a PI, your local
FSDO.
(2) Airworthy Product: For any requirement in this AD to obtain
corrective actions from a manufacturer or other source, use these
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 assure the product
is airworthy before it is returned to service.
(3) Reporting Requirements: For any reporting requirement in
this AD, under the provisions of the Paperwork Reduction Act, the
Office of Management and Budget (OMB) has approved the information
collection requirements and has assigned OMB Control Number 2120-
0056.
Related Information
(h) Refer to MCAI Dutch Airworthiness Directive NL-2005-008,
dated June 30, 2005, Fokker 70/100 Service Letter 102, Revision 1,
dated February 12, 1998, and Messier-Dowty Service Bulletin F100-32-
72, Revision 1, dated March 5, 2007, for related information.
Issued in Renton, Washington, on July 30, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E7-16123 Filed 8-15-07; 8:45 am]
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