
[Federal Register: March 15, 2010 (Volume 75, Number 49)]
[Proposed Rules]               
[Page 12150-12151]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr15mr10-9]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0250; Directorate Identifier 2010-CE-011-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 the 
discovery of corrosion at the bonding strap connections on the left 
and right lower longerons between fuselage frames 1 and 1A. The 
possibility of corrosion is increased because of the high electrical 
current flow between the tinned copper terminal lug of the bonding 
strap and the aluminum longeron.
    Such a condition, if left uncorrected, could lead to failure of 
the longeron and will prejudice the structural integrity 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 April 29, 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-2010-0250; 
Directorate Identifier 2010-CE-011-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 FOCA AD HB-2010-001, dated 
February 12, 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 the 
discovery of corrosion at the bonding strap connections on the left 
and right lower longerons between fuselage frames 1 and 1A. The 
possibility of corrosion is increased because of the high electrical 
current flow between the tinned copper terminal lug of the bonding 
strap and the aluminum longeron.
    Such a condition, if left uncorrected, could lead to failure of 
the longeron and will prejudice the structural integrity of the 
aircraft. In order to correct and control the situation, this AD 
requires a one time inspection of the longeron structure and the 
terminal lugs of the bonding straps for signs of corrosion.

For left and right lower longerons where corrosion is found during the 
inspection, the MCAI also requires repair of any longeron where 
corrosion is found. You may obtain further information by examining the 
MCAI in the AD docket.

Relevant Service Information

    PILATUS Aircraft Ltd. has issued PILATUS PC-7 Service Bulletin No. 
53-007, dated January 5, 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.

Costs of Compliance

    We estimate that this proposed AD will affect 10 products of U.S. 
registry. We also estimate that it would take about 4.5 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 $3,825, or $383 per product.
    In addition, we estimate that any necessary follow-on actions would 
take

[[Page 12151]]

about 3 work-hours and require parts costing $500, for a cost of $755 
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-2010-0250; Directorate 
Identifier 2010-CE-011-AD.

Comments Due Date

    (a) We must receive comments by April 29, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Model PC-7 airplanes, all serial numbers, 
certificated in any category.

Subject

    (d) Air Transport Association of America (ATA) Code 53: 
Fuselage.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    This Airworthiness Directive (AD) is prompted due to the 
discovery of corrosion at the bonding strap connections on the left 
and right lower longerons between fuselage frames 1 and 1A. The 
possibility of corrosion is increased because of the high electrical 
current flow between the tinned copper terminal lug of the bonding 
strap and the aluminum longeron.
    Such a condition, if left uncorrected, could lead to failure of 
the longeron and will prejudice the structural integrity of the 
aircraft.
    In order to correct and control the situation, this AD requires 
a one time inspection of the longeron structure and the terminal 
lugs of the bonding straps for signs of corrosion.
    For left and right lower longerons where corrosion is found 
during the inspection, the MCAI also requires repair of any longeron 
where corrosion is found.

Actions and Compliance

    (f) Unless already done, do the following actions:
    (1) Within the next 120 days after the effective date of this 
AD, perform a visual inspection of the forward bonding points and 
the terminal lugs on the left and right lower longerons between 
fuselage frames 1 and 1A for signs of corrosion. Do the inspection 
following paragraphs 3.C.(1), (2), and (3) of PILATUS PC-7 Service 
Bulletin No. 53-007, dated January 5, 2010.
    (2) If during the inspection required in paragraph (f)(1) of 
this AD, any signs of corrosion are found, prior to further flight, 
perform corrective actions in accordance with the Accomplishment 
Instructions in paragraph 3.D of PILATUS PC-7 SB No. 53-007, dated 
January 5, 2010. If the corrosion damage is out of limits, record 
the values and apply to PILATUS for a repair scheme at: PILATUS 
AIRCRAFT LTD., Customer Service Manager, CH-6371 STANS, Switzerland; 
telephone: +41 (0) 41 619 62 08; fax: +41 (0) 41 619 73 11.

    Note 1: The Federal Office of Civil Aviation (FOCA), which is 
the airworthiness authority for Switzerland, will work with PILATUS 
in reviewing the results of the initial inspection required by this 
AD. From this, a repetitive inspection requirement or other action 
may be established. The FAA will evaluate any such action and 
determine whether further rulemaking is necessary.

FAA AD Differences

    Note 2: 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.

Related Information

    (h) Refer to MCAI FOCA AD HB-2010-001, dated February 12, 2010; 
and PILATUS PC-7 Service Bulletin No. 53-007, dated January 5, 2010, 
for related information.

    Issued in Kansas City, Missouri, on March 4, 2010.
Sandra J. Campbell,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-5508 Filed 3-12-10; 8:45 am]
BILLING CODE 4910-13-P

