
[Federal Register: August 6, 2008 (Volume 73, Number 152)]
[Proposed Rules]               
[Page 45644-45646]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr06au08-18]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0834; Directorate Identifier 2007-SW-78-AD]
RIN 2120-AA64

 
Airworthiness Directives; Agusta S.p.A. Model A109A and A109A II 
Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to adopt a superseding airworthiness directive (AD) 
for the specified Agusta S.p.A. (Agusta) model helicopters. This 
proposed AD results from a revised mandatory continuing airworthiness 
information (MCAI) originated by an aviation authority to identify and 
correct an unsafe condition on an aviation product. The aviation 
authority of Italy, with which we have a bilateral agreement, reports 
that the previous MCAI should not apply to newly redesigned and 
improved tail rotor blades. This action proposes the same inspection 
requirements as the current AD but would limit the applicability to 
only three part-numbered tail rotor blades. The proposed AD would 
require actions that are intended to prevent fatigue failure of a tail 
rotor blade (blade), loss of a tail rotor, and subsequent loss of 
control of the helicopter.

DATES: We must receive comments on this proposed AD by September 5, 
2008.

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.
    You may get the service information identified in this AD from 
Agusta, 21017 Cascina Costa di Samarate (VA) Italy, Via Giovanni Agusta 
520, telephone 39 (0331) 229111, fax 39 (0331) 229605-222595.
    Examining the AD Docket: You may examine the AD docket on the 
Internet at http://www.regulations.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 
economic 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: Sharon Miles, Aviation Safety 
Engineer, FAA, Rotorcraft Directorate, Regulations and Guidance Group, 
Fort Worth, Texas 76193-0111, telephone (817) 222-5122, fax (817) 222-
5961.

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-2008-0834; 
Directorate Identifier 2007-SW-78-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://
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

    Ente Nazionale Per L'Aviazione Civile (ENAC), which is the Aviation 
Authority for Italy, has issued an MCAI in the form of ENAC AD No. 
2006-001, Revision 1, dated January 3, 2006 (referred to after this as 
``the MCAI''), to correct an unsafe condition for the Italian-
certificated product. The aviation authority of Italy, with which we 
have a bilateral agreement, reports that this MCAI cancels Registro 
Aeronautico Italiano AD 1999-325, which was our basis for issuing FAA 
AD 99-27-12. They state that the AD should not apply to certain newly 
redesigned and improved blades. You may obtain further information by 
examining the MCAI and the service information in the AD docket.

Relevant Service Information

    Agusta has issued Bollettino Tecnico No. 109-110, Revision A, dated 
December 12, 2005 (BT). The actions described in the MCAI are intended 
to correct the same unsafe condition as that identified in the BT. 
Agusta advises that the inspection for cracks should only apply to 
blades, part number (P/N) 109-0132-02-11/-15/-121 with 400 or more 
flight hours and not to new blade, P/N 109-0132-02-125, because it was 
designed and certified with improved structural characteristics. The BT 
continues to stress the importance of performing a detailed inspection 
of the subject blades for cracks already prescribed in Telegraphic 
Technical Bulletin No. 109-5, dated January 27, 1987.

FAA's Determination and Requirements of This Proposed AD

    This product has been approved by the aviation authority of Italy, 
and is

[[Page 45645]]

approved for operation in the United States. Pursuant to our bilateral 
agreement with this State of Design Authority, we have been notified of 
the unsafe condition described in the MCAI and service information. 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 designs.

Differences Between the AD and the MCAI

    We have reviewed the MCAI and related service information and, in 
general, agree with their substance. The MCAI states to comply with the 
manufacturer's BT. This AD differs from the incorporated portions of 
the BT as follows:
    (1) We refer to the compliance time as hours time-in-service rather 
than flight hours.
    (2) We do not require you to contact the manufacturer.
    These differences are highlighted in the ``Differences Between the 
FAA AD and the MCAI'' section in the AD.

Costs of Compliance

    We estimate that this proposed AD would affect 40 helicopters of 
U.S. registry. We also estimate that it would take about 2.5 work-hours 
to inspect the affected blades of each helicopter at an average labor 
rate of $80 per work-hour. The cost of performing the daily magnifying 
glass visual inspection is negligible. Based on these figures, we 
estimate the cost of the proposed AD on U.S. operators to be $48,000, 
assuming 6 dye-penetrant inspections a year, the cost of performing the 
daily magnifying glass inspection is negligible, and no cracked blades 
are found.

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 an economic 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 removing AD 99-27-12, Amendment 
39-11493, Docket No. 99-SW-91-AD (65 FR 346, January 5, 2000), and by 
adding the following new AD:

Agusta S.p.A.: Docket No. FAA-2008-0834; Directorate Identifier 
2007-SW-78-AD.

Comments Due Date

    (a) We must receive comments by September 5, 2008.

Affected ADs

    (b) This AD supersedes AD 99-27-12, Amendment 39-11493, Docket 
No. 99-SW-91-AD.

Applicability

    (c) This AD applies to Model A109A and A109A II helicopters, 
with a tail rotor blade (blade), part number (P/N) 109-0132-02-11, -
15, and -121, with 400 or more hours time-in-service (TIS), 
installed, certificated in any category.

Reason

    (d) Based on the Italian mandatory continued airworthiness 
information (MCAI) AD, this action contains the same requirement as 
superseded AD 99-27-12 but narrows the applicability from blade, P/N 
``109-0132-02-all dash numbers,'' to specific P/Ns ``109-0132-02-11, 
-15, and -121.'' Thus, this action does not apply to blades with any 
other P/N, including newly-designated blade, P/N 109-0132-02-125. 
The actions specified by this AD are intended to continue the 
requirements to prevent fatigue failure of a blade, loss of a tail 
rotor, and subsequent loss of control of the helicopter.

Actions and Compliance

    (e) Required as indicated, unless already done, do the following 
actions.
    (1) Before further flight, dye-penetrant inspect each blade for 
a crack by following the Compliance Instructions, Part I, of Agusta 
S.p.A. Bollettino Tecnico No. 109-110, Revision A, dated December 
12, 2005 (BT). Thereafter, at intervals not to exceed 100 hours TIS, 
dye-penetrant inspect each blade for a crack by following the 
Compliance Instructions, Part III, of the BT. If you find a crack, 
replace the cracked blade with an airworthy blade before further 
flight.
    (2) Before the first flight each day, visually inspect each 
blade for a crack using a 3 to 5 power magnifying glass by following 
the Compliance Instructions, Part II, of the BT. If you find a 
crack, replace the cracked blade with an airworthy blade before 
further flight.

Differences Between the FAA AD and the MCAI

    (f) The MCAI states to comply with the manufacturer's BT. This 
AD differs from the incorporated portions of the BT as follows:
    (1) We refer to the compliance time as hours TIS rather than 
flight hours.
    (2) We do not require you to contact the manufacturer.

Other Information

    (g) Alternative Methods of Compliance (AMOCs): The Manager, 
Safety Management Group, Rotorcraft 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: Sharon 
Miles, Aviation Safety Engineer, Regulations and Guidance Group, 
Fort Worth, Texas 76193-0111, telephone (817) 222-5122, fax (817) 
222-5961.

Related Information

    (h) Mandatory Continuing Airworthiness Information (MCAI) ENAC 
AD No. 2006-001, Revision 1, dated January 3, 2006, contains related 
information.

Subject

    (i) Air Transport Association of America (ATA) Code 6410: Main 
Rotor Blades.


[[Page 45646]]


    Issued in Fort Worth, Texas, on July 27, 2008.
Mark R. Schilling,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. E8-17992 Filed 8-5-08; 8:45 am]

BILLING CODE 4910-13-P
