

[Federal Register: October 24, 2007 (Volume 72, Number 205)]
[Rules and Regulations]               
[Page 60231-60233]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr24oc07-3]                         

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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; 
Amendment 39-15242; AD 2007-22-06]
RIN 2120-AA64

 
Airworthiness Directives; Fokker Model F.28 Mark 0070 and 0100 
Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for the 
products listed above. This 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. * * *

We are issuing this AD to require actions to correct the unsafe 
condition on these products.

DATES: This AD becomes effective November 28, 2007.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of November 28, 
2007.

ADDRESSES: You may examine the AD docket on the Internet at http://dms.dot.gov
 or in person at the U.S. Department of Transportation, 

Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 
New Jersey Avenue, SE., Washington, DC.

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: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to include an AD that would apply to the specified products. 
That NPRM was published in the Federal Register on August 16, 2007 (72 
FR 45956). That NPRM proposed to correct an unsafe condition for the 
specified products. The 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.

You may obtain further information by examining the MCAI in the AD 
docket.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM or on the determination of 
the cost to the public.

Conclusion

    We reviewed the available data and determined that air safety and 
the public interest require adopting the AD as proposed.

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 required different actions in this AD from those 
in the MCAI in order to follow our FAA policies. Any such differences 
are highlighted in a NOTE within the AD.

Costs of Compliance

    We estimate that this AD will affect 13 products of U.S. registry. 
We also estimate that it will take about 4 work-hours per product to 
comply with the basic requirements of this AD. The average labor rate 
is $80 per work-hour. Required parts will 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 parts. 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 this AD to the 
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.

[[Page 60232]]

    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.

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 the NPRM, 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, 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:

2007-22-06 Fokker Services B.V.: Amendment 39-15242. Docket No. FAA-
2007-28923; Directorate Identifier 2007-NM-133-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective November 
28, 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.

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 2: 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.

[[Page 60233]]

    (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, and the service information identified in Table 
1 of this AD, for related information.

                  Table 1.--Related Service Information
------------------------------------------------------------------------
     Service information       Revision level             Date
------------------------------------------------------------------------
Fokker 70/100 Service Letter                1  February 12, 1998.
 102.
Fokker Service Bulletin                     2  April 29, 2005.
 SBF100-32-096.
Messier-Dowty Service                       1  March 5, 2007.
 Bulletin F100-32-72.
------------------------------------------------------------------------

Material Incorporated by Reference

    (i) You must use Messier-Dowty Service Bulletin F100-32-72, 
Revision 1, dated March 5, 2007, to do the actions required by this 
AD, unless the AD specifies otherwise.
    (1) The Director of the Federal Register approved the 
incorporation by reference of this service information under 5 
U.S.C. 552(a) and 1 CFR part 51.
    (2) For service information identified in this AD, contact 
Fokker Services B.V., Technical Services Dept., P.O. Box 231, 2150 
AE Nieuw-Vennep, the Netherlands.
    (3) You may review copies at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the 
National Archives and Records Administration (NARA). For information 
on the availability of this material at NARA, call (202) 741-6030, 
or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html
.


    Issued in Renton, Washington, on October 12, 2007.
Stephen P. Boyd,
Assistant Manager, Transport Airplane Directorate, Aircraft 
Certification Service.
 [FR Doc. E7-20814 Filed 10-23-07; 8:45 am]

BILLING CODE 4910-13-P
