Airworthiness Directives; Aircraft Industries, a.s. (Type Certificate No. G24EU Formerly Held by LETECKÉ ZÁVODY a.s. and LET Aeronautical Works) Model L-13 Blanik Gliders, 56700-56701 [E7-19619]

Agencies

• Federal Aviation Administration
• DEPARTMENT OF TRANSPORTATION

[Federal Register Volume 72, Number 192 (Thursday, October 4, 2007)]
[Proposed Rules]
[Pages 56700-56701]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-19619]



[[Page 56700]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-28980; Directorate Identifier 2007-CE-071-AD]
RIN 2120-AA64


Airworthiness Directives; Aircraft Industries, a.s. (Type 
Certificate No. G24EU Formerly Held by LETECK[Eacute] Z[Aacute]VODY 
a.s. and LET Aeronautical Works) Model L-13 Blanik Gliders

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 by the discovery 
of cracks on L13 BLANIK sailplanes in zones where the forward and 
aft control sticks are attached to the connecting rod, designated as 
``control bridge'' in the relevant Illustrated Parts Catalogues 
(IPC). If left uncorrected, cracks could propagate and lead to 
failure of the connecting rod with subsequent loss of control of the 
sailplane.

    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 November 5, 
2007.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to https://
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 https://
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: Greg Davison, Glider Program Manager, 
FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, 
Missouri 64106; telephone: (816) 329-4130; 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-2007-
28980; Directorate Identifier 2007-CE-071-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 https://
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 European Aviation Safety Agency (EASA), which is the Technical 
Agent for the Member States of the European Community, has issued AD 
No.: 2007-0212 (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 by the discovery 
of cracks on L13 BLANIK sailplanes in zones where the forward and 
aft control sticks are attached to the connecting rod, designated as 
``control bridge'' in the relevant Illustrated Parts Catalogues 
(IPC). If left uncorrected, cracks could propagate and lead to 
failure of the connecting rod with subsequent loss of control of the 
sailplane.
    For the reasons described above, this AD requires an inspection 
of the control bridge to detect cracks and replacement, if 
necessary. In addition, this AD requires an update of the aircraft 
Maintenance Manual (MM) to incorporate repetitive inspections of the 
control bridge.

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

Relevant Service Information

    LET Aircraft Industries, a.s. has issued Mandatory Bulletin MB No.: 
L13/105a, dated May 22, 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 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

    Based on the service information, we estimate that this proposed AD 
would affect about 190 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 $80 per 
work-hour.
    Based on these figures, we estimate the cost of the proposed AD on 
U.S. operators to be $30,400, or $160 per product.
    In addition, we estimate that any necessary follow-on actions would 
take about 7 work-hours and require parts costing $2,000, for a cost of 
$2,560 per product. We have no way of determining the number of 
products that may need these actions.

[[Page 56701]]

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:

Aircraft Industries, a.s. (Type Certificate No. G24EU formerly held 
by LETECK[Eacute] Z[Aacute]VODY a.s. and LET Aeronautical Works): 
Docket No. FAA-2007-28980; Directorate Identifier 2007-CE-071-AD.

Comments Due Date

    (a) We must receive comments by November 5, 2007.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Model L-13 Blanik gliders, all serial 
numbers, certificated in any category.

Subject

    (d) Air Transport Association of America (ATA) Code 27: Flight 
Controls.

Reason

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

    This Airworthiness Directive (AD) is prompted by the discovery 
of cracks on L13 BLANIK sailplanes in zones where the forward and 
aft control sticks are attached to the connecting rod, designated as 
``control bridge'' in the relevant Illustrated Parts Catalogues 
(IPC). If left uncorrected, cracks could propagate and lead to 
failure of the connecting rod with subsequent loss of control of the 
sailplane.
    For the reasons described above, this AD requires an inspection 
of the control bridge to detect cracks and replacement, if 
necessary. In addition, this AD requires an update of the aircraft 
Maintenance Manual (MM) to incorporate repetitive inspections of the 
control bridge.

Actions and Compliance

    (f) Unless already done, do the following actions:
    (1) Within the next 3 months after the effective date of this AD 
and repetitively thereafter at intervals not to exceed 12 months, 
inspect the control bridge for cracks. Follow the procedures in LET 
Aircraft Industries, a.s. Mandatory Bulletin MB No.: L13/105a, dated 
May 22, 2007, except use a 10x magnifier and do a dye penetrant 
inspection following the procedures in chapter 5, section 5, of FAA 
Advisory Circular AC 43.13-1B CHG 1, dated September 27, 2001.
    (2) If cracks are found during any inspection in paragraph 
(f)(1) of this AD, before further flight, install a new control 
bridge Dwg. No. (part number (P/N)) A740 370 N or Dwg. No. (P/N) 
A401 001N following the procedures in LET Aircraft Industries, a.s. 
Mandatory Bulletin MB No.: L13/105a, dated May 22, 2007.

FAA AD Differences

    Note: This AD differs from the MCAI and/or service information 
as follows:
    (1) The service information requires a visual inspection with a 
6x magnifier. We are requiring a dye penetrant inspection and a 10x 
magnifier to detect cracks that could go undetected using only a 6x 
magnifier.
    (2) The MCAI requires updating the maintenance manuals to add 
``type A based'' repetitive inspections of the control bridge. Since 
the maintenance manual is only one way of establishing a maintenance 
program, the only way we can mandate these repetitive inspections is 
through an AD action.

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: Greg Davison, Glider Program Manager, FAA, 
Small Airplane Directorate, 901 Locust, Room 301, Kansas City, 
Missouri 64106; telephone: (816) 329-4130; 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 European Aviation Safety Agency (EASA) AD No. 
2007-0212, dated August 7, 2007; and LET Aircraft Industries, a.s. 
Mandatory Bulletin MB No.: L13/105a, dated May 22, 2007, for related 
information.

    Issued in Kansas City, Missouri, on September 28, 2007.
James E. Jackson,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E7-19619 Filed 10-3-07; 8:45 am]
BILLING CODE 4910-13-P