
[Federal Register: August 26, 2010 (Volume 75, Number 165)]
[Proposed Rules]               
[Page 52482-52484]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr26au10-20]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0849; Directorate Identifier 2010-CE-043-AD]
RIN 2120-AA64

 
Airworthiness Directives; PILATUS Aircraft Ltd. Model PC-7 
Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (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: This Airworthiness Directive (AD) is prompted due to an 
occurrence when an aircraft had a partial in-flight separation of the 
aileron outboard bearing support. The aileron outboard bearing supports 
are attached with two forward attachment bolts and two aft attachment 
bolts. The forward attachment bolts are approximately 3.2 mm (0.125 
inch) longer than the aft attachment bolts. If the aileron outboard 
bearing supports have been removed, it is possible that during the 
reinstallation of the aileron outboard bearing supports, the attachment 
bolts can be installed in wrong positions. Bolts that are installed in 
wrong positions can damage the threads in the rear attachment anchor 
nuts. Such a condition, if left uncorrected, could lead to in-flight 
separation of the aileron outboard bearing support, and as a 
consequence, the loss or limited controllability of the aircraft. 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 October 12, 
2010.

ADDRESSES: You may send comments 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: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.

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 (telephone (800) 647-5527) is in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

FOR FURTHER INFORMATION CONTACT: Doug Rudolph, Aerospace Engineer, FAA, 
Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 
64106; telephone: (816) 329-4059; fax: (816) 329-4090.

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-2010-0849; 
Directorate Identifier 2010-CE-043-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 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

    The Federal Office of Civil Aviation (FOCA), which is the aviation 
authority for Switzerland, has issued AD HB-2010-010, dated July 29, 
2010 (referred to after this as ``the MCAI''), to correct an unsafe 
condition for the specified products. The MCAI states:

    This Airworthiness Directive (AD) is prompted due to an 
occurrence when an aircraft had a partial in-flight separation of 
the aileron outboard bearing support.
    The aileron outboard bearing supports are attached with two 
forward attachment bolts and two aft attachment bolts. The forward 
attachment bolts are approximately 3.2 mm

[[Page 52483]]

(0.125 inch) longer than the aft attachment bolts. If the aileron 
outboard bearing supports have been removed, it is possible that 
during the reinstallation of the aileron outboard bearing supports, 
the attachment bolts can be installed in wrong positions. Bolts that 
are installed in wrong positions can damage the threads in the rear 
attachment anchor nuts.
    Such a condition, if left uncorrected, could lead to in-flight 
separation of the aileron outboard bearing support, and as a 
consequence, the loss or limited controllability of the aircraft.
    In order to correct and control the situation, this AD requires 
a one time inspection to verify that the bolts are installed in the 
correct positions and the threads of the anchor nuts are in good 
condition. The replacement of the attachment hardware is required if 
any damage on the anchor nut threads or a bolt at the wrong location 
is found.

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

Relevant Service Information

    Pilatus Aircraft Ltd. has issued PC-7 Service Bulletin No. 57-015, 
Rev. No. 1, date July 23, 2010. The actions described in this service 
information are intended to correct the unsafe condition identified in 
the MCAI.

FAA's Determination and Requirements of the 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 this State of Design Authority, they 
have notified us of the unsafe condition described in the MCAI and 
service information referenced above. We are proposing this AD because 
we evaluated all information and determined the unsafe condition exists 
and is likely to exist or develop on other products of the same type 
design.

Differences Between This Proposed 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

    We estimate that this proposed AD will affect 12 products of U.S. 
registry. We also estimate that it would take about 2 work-hours per 
product to comply with the basic requirements of this proposed AD. The 
average labor rate is $85 per work-hour.
    Based on these figures, we estimate the cost of the proposed AD on 
U.S. operators to be $2,040, or $170 per product.
    In addition, we estimate that any necessary follow-on actions would 
take about 25 work-hours and require parts costing $200, for a cost of 
$2,325 per product. We have no way of determining the number of 
products that may need these actions.

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, 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 AD:

Pilatus Aircraft Ltd.: Docket No. FAA-2010-0849; Directorate 
Identifier 2010-CE-043-AD.

Comments Due Date

    (a) We must receive comments by October 12, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to PILATUS Aircraft Ltd. Model PC-7 
airplanes, manufacturer serial numbers (MSN) 101 through 618, 
certificated in any category.

Subject

    (d) Air Transport Association of America (ATA) Code 57: Wings.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:

    This Airworthiness Directive (AD) is prompted due to an 
occurrence when an aircraft had a partial in-flight separation of 
the aileron outboard bearing support.
    The aileron outboard bearing supports are attached with two 
forward attachment bolts and two aft attachment bolts. The forward 
attachment bolts are approximately 3.2 mm (0.125 inch) longer than 
the aft attachment bolts. If the aileron outboard bearing supports 
have been removed, it is possible that during the reinstallation of 
the aileron outboard bearing supports, the attachment bolts can be 
installed in wrong positions. Bolts that are installed in wrong 
positions can damage the threads in the rear attachment anchor nuts.
    Such a condition, if left uncorrected, could lead to in-flight 
separation of the aileron outboard bearing support, and as a 
consequence, the loss or limited controllability of the aircraft.
    In order to correct and control the situation, this AD requires 
a one time inspection to verify that the bolts are

[[Page 52484]]

installed in the correct positions and the threads of the anchor 
nuts are in good condition. The replacement of the attachment 
hardware is required if any damage on the anchor nut threads or a 
bolt at the wrong location is found.

Actions and Compliance

    (f) Unless already done, do the following actions:
    (1) Within 1 month after the effective date of this AD, check 
the airplane maintenance records to determine if the left and/or 
right aileron outboard bearing supports have been removed at any 
time during the life of the airplane. Do this check following 
paragraph 3.A. of Pilatus Aircraft Ltd. PC-7 Service Bulletin No. 
57-015, Rev. No. 1, date July 23, 2010.
    (2) If an entry is found during the airplane maintenance records 
check required in paragraph (f)(1) of this AD or it is unclear 
whether or not the left and/or right aileron outboard bearing 
supports have been removed, perform the actions following the 
instructions in paragraph 3.A.(2) through paragraph 3.E of Pilatus 
Aircraft Ltd. PC-7 Service Bulletin No. 57-015, Rev. No. 1, date 
July 23, 2010.

FAA AD Differences

    Note: This AD differs from the MCAI and/or service information 
as follows: No differences.

Other FAA AD Provisions

    (g) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
Standards Office, 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: Doug Rudolph, Aerospace Engineer, FAA, Small 
Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 
64106; telephone: (816) 329-4059; fax: (816) 329-4090. 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 (44 
U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has 
approved the information collection requirements and has assigned 
OMB Control Number 2120-0056.

Special Flight Permit

    (h) Special flight permits will not be issued.

Related Information

    (i) Refer to MCAI Federal Office of Civil Aviation (FOCA) AD HB-
2010-010, dated July 29, 2010; and Pilatus Aircraft Ltd. PC-7 
Service Bulletin No. 57-015, Rev. No. 1, date July 23, 2010, for 
related information.

    Issued in Kansas City, Missouri, on August 19, 2010.
John Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-21182 Filed 8-25-10; 8:45 am]
BILLING CODE 4910-13-P

