
[Federal Register: March 16, 2010 (Volume 75, Number 50)]
[Rules and Regulations]               
[Page 12441-12445]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr16mr10-4]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0953; Directorate Identifier 2009-SW-45-AD; 
Amendment 39-16230; AD 2010-06-06]
RIN 2120-AA64

 
Airworthiness Directives; MD Helicopters, Inc. Model MD-900 
Helicopters

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment supersedes an existing airworthiness directive 
(AD) for MD Helicopters, Inc. (MDHI) model MD-900 helicopters that 
currently requires applying serial numbers to certain parts, increasing 
the life limit for various parts, maintaining a previously established 
life limit for a certain vertical stabilizer control system (VSCS) 
bellcrank assembly and bellcrank arm, and correcting the part number 
for the VSCS bellcrank arm. This amendment requires the same actions as 
the existing AD, except it reduces the life limit of the swashplate 
spherical slider bearing (slider bearing). It further corrects what was 
described as a ``bellcrank arm'' life limit in the current AD and 
correctly describes it as another ``bellcrank assembly'' life limit. 
This amendment is prompted by two reports of cracks in the slider 
bearing that occurred well before the previously increased retirement 
life of 2,030 hours time-in-service (TIS) was reached. The actions 
specified by this AD are intended to establish appropriate life limits 
for various parts, and to prevent fatigue failure of those parts and 
subsequent loss of control of the helicopter.

DATES: Effective April 20, 2010.

ADDRESSES: You may get the service information identified in this AD 
from MD Helicopters Inc., Attn: Customer Support Division, 4555 E. 
McDowell Rd., Mail Stop M615, Mesa, Arizona 85215-9734, telephone 1-
800-388-3378, fax 480-346-6813, or on the Web at http://
www.mdhelicopters.com.
    Examining the Docket: You may examine the docket that contains this 
AD, any comments, and other information on the Internet at http://
www.regulations.gov, or at the Docket Operations office, West Building 
Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, 
DC.

FOR FURTHER INFORMATION CONTACT: Roger Durbin, Aviation Safety 
Engineer,

[[Page 12442]]

FAA, Los Angeles Aircraft Certification Office, Airframe Branch, 3960 
Paramount Blvd., Lakewood, California 90712, telephone (562) 627-5233, 
fax (562) 627-5210.

SUPPLEMENTARY INFORMATION: A proposal to amend 14 CFR part 39 by 
superseding AD 99-16-13, Amendment 39-11248 (64 FR 42824, August 6, 
1999), Docket No. 98-SW-42-AD, for the MDHI Model MD-900 helicopters 
was published in the Federal Register on October 22, 2009 (74 FR 
54495). The action proposed to decrease the life limit of the slider 
bearing from 2,030 hours TIS to 700 hours time-in-service (TIS). 
Additionally, changing the nomenclature for part number 900F2341712-101 
from bellcrank arm to bellcrank assembly was proposed. The action also 
proposed to retain the requirements of the existing AD to apply serial 
numbers to various parts, and to retain the life limits of various 
other parts.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. No comments were received on the 
proposal or the FAA's determination of the cost to the public. The FAA 
has determined that air safety and the public interest require the 
adoption of the rule as proposed.
    The FAA estimates that this AD will affect 27 helicopters of U.S. 
registry, and that it will take approximately 2.5 work hours per 
helicopter to accomplish the serialization of the affected parts at an 
average labor rate of $85 per work hour. Additionally, it is estimated 
that 8 of those aircraft will require replacement of the slider 
bearing, which will require approximately 7 work hours to accomplish at 
an average labor rate of $85 per work hour. Required parts will cost 
approximately $11,080 per helicopter for the slider bearing. Based on 
these figures, we estimate the total cost impact of the AD on U.S. 
operators to be $99,137.

Regulatory Findings

    We have 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 that the 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 AD. See the AD docket to examine the economic evaluation.

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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

Adoption of the Amendment

0
Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (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. Section 39.13 is amended by removing Amendment 39-11248 (64 FR 
42824, August 6, 1999), and by adding a new airworthiness directive 
(AD), Amendment 39-16230, to read as follows:

2010-06-06 MD Helicopters, Inc.: Amendment 39-16230. Docket No. FAA-
2009-0953; Directorate Identifier 2009-SW-45-AD. Supersedes AD 99-
16-13, Amendment 39-11248, Docket No. 98-SW-42-AD.

    Applicability: MD-900 helicopters, certificated in any category.
    Compliance: Required as indicated, unless accomplished 
previously.
    To establish appropriate life limits for various parts, and to 
prevent fatigue failure of those parts and subsequent loss of 
control of the helicopter, accomplish the following:
    (a) Remove from service as follows:
    (1) The nonrotating swashplate assembly, part number (P/N) 
900C2010192-105, -107, -109, or -111, on or before 1,800 hours time-
in-service (TIS).
    (2) The collective drive link assembly, P/N 900C2010207-101, on 
or before 3,307 hours TIS.
    (3) The swashplate spherical slider bearing, P/N 900C3010042-
103, on or before 700 hours TIS.
    (4) The vertical stabilizer control system (VSCS) bellcrank 
assembly, P/N 900FP341712-103, and bellcrank assembly, P/N 
900F2341712-101, on or before 2,700 hours TIS.
    (b) Within 100 hours TIS:
    (1) For Model MD-900 helicopters with serial numbers (S/N) 900-
00002 through 900-00012, apply the appropriate S/N to the mid-
forward truss assembly, P/N 900F2401200-102, and the forward and aft 
deck-fitting assemblies, P/N 900F2401500-103 and P/N 900F2401600-
103.
    (2) For Model MD-900 helicopters with S/N 900-00002 through 900-
00048, apply S/N to the left and right VSCS bellcrank assemblies, P/
N 900F2341712-101 and P/N 900FP341712-103, and the mid-aft truss 
strut assembly, P/N 900F2401300-103.
    (3) Apply the S/N, as specified in paragraphs (b)(1) and (b)(2) 
of this AD, adjacent to the existing P/N, as listed in Appendix A of 
this AD, using permanent ink or paint. When dry, apply a clear coat 
over the S/N.
    (c) This AD revises the Airworthiness Limitations Section of the 
MD-900 Maintenance Manual by increasing the life limits for certain 
parts and reducing the life limit of the slider bearing.

    Note: The Airworthiness Limitations Section of the MD-900 
Rotorcraft Maintenance Manual, Reissue 1, Revision 25, dated April 
16, 2006, and MD Helicopters Service Bulletin SB900-096, dated 
February 28, 2005, pertain to the subject of this AD.

    (d) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Contact the Manager, Los Angeles Aircraft Certification Office, FAA, 
for information about previously approved alternative methods of 
compliance.
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    (e) This amendment becomes effective on April 20, 2010.

    Issued in Fort Worth, Texas, on February 18, 2010.
Mark R. Schilling,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 2010-5325 Filed 3-15-10; 8:45 am]
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