Airworthiness Directives; CFM International, S.A. CFM56-5, -5B, and -7B Series Turbofan Engines

[Federal Register Volume 75, Number 118 (Monday, June 21, 2010)]
[Rules and Regulations]
[Pages 34924-34925]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2010-14819]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0026; Directorate Identifier 2010-NE-03-AD; 
Amendment 39-16340; AD 2010-13-09]
RIN 2120-AA64


Airworthiness Directives; CFM International, S.A. CFM56-5, -5B, 
and -7B Series Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for CFM 
International, S.A. CFM56-5, -5B, and -7B series turbofan engines. This 
AD requires removing from service, nine stage 3 low-pressure turbine 
(LPT) disks, identified by serial number (S/N). This AD results from 
the discovery of a material nonconformity requiring removal of the disk 
before the certified disk life of certain stage 3 LPT disks. We are 
issuing this AD to prevent uncontained failure of the stage 3 LPT disk 
and damage to the airplane.

DATES: This AD becomes effective July 26, 2010.

ADDRESSES: The Docket Operations office is located at Docket Management 
Facility, U.S. Department of Transportation, 1200 New Jersey Avenue, 
SE., West Building Ground Floor, Room W12-140, Washington, DC 20590-
0001.

FOR FURTHER INFORMATION CONTACT: Antonio Cancelliere, Aerospace 
Engineer, Engine Certification Office, FAA, Engine & Propeller 
Directorate, 12 New England Executive Park, Burlington, MA 01803; e-
mail: [email protected]; telephone (781) 238-7751; fax (781) 
238-7199.

SUPPLEMENTARY INFORMATION: The FAA proposed to amend 14 CFR part 39 
with a proposed AD. The proposed AD applies to CFM International, S.A. 
CFM56-5, -5B, and -7B series turbofan engines. We published the 
proposed AD in the Federal Register on March 18, 2010 (75 FR 13045). 
That action proposed to require removing from service, nine stage 3 LPT 
disks, identified by S/N.

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 AD, the regulatory evaluation, 
any comments received, and other information. The street address for 
the Docket Operations office (telephone (800) 647-5527) is provided in 
the ADDRESSES section. Comments will be available in the AD docket 
shortly after receipt.

Comments

    We provided the public the opportunity to participate in the 
development of this AD. We have considered the comments received. Two 
commenters support the proposal as written.

Remove the Airbus A340 Reference

    One commenter, CFM International, S.A., requests that we remove the 
reference to the Airbus A340 airplane from the applicability paragraph, 
as the engines used on that airplane are CFM56-5C engines, and use a 
different disk P/N not affected by this AD.
    We agree. We removed the A340 reference from the AD.

Request To Reference the Disk Part Number

    CFM International, S.A., requests that we reference the disk part 
number of 336-002-006-0, along with the affected disk serial numbers, 
in the applicability paragraph to help identify the parts to be 
removed.
    We agree. We added the disk part number to the applicability 
paragraph.

Request To Clarify the Applicability Paragraph

    CFM International, S.A., requests clarification of the 
applicability paragraph that none of these affected disk S/Ns were 
originally installed on any CFM56-5 turbofan engines, however, that 
disk P/N is certified for use on CFM56-5 engines.
    We agree and changed the applicability paragraph.

Request To Reference European Aviation Safety Agency (EASA) Related AD

    CFM International, S.A., requests that we reference the EASA 
related AD in our AD.

[[Page 34925]]

    We agree and added a reference to EASA AD 2009-0270 in the AD.

Conclusion

    We have carefully reviewed the available data, including the 
comments received, and determined that air safety and the public 
interest require adopting the AD with the changes described previously. 
We have determined that these changes will neither increase the 
economic burden on any operator nor increase the scope of the AD.

Costs of Compliance

    We estimate that this AD will affect two engines installed on 
airplanes of U.S. registry. The pro-rated cost of the replacement parts 
is $40,375 per engine. We estimate that no additional labor costs will 
be incurred to perform the required disk removals, because the removals 
will be done at time of engine shop visit. Based on these figures, we 
estimate the total cost of the AD to U.S. operators to be $80,750.

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 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 this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866;
    (2) Is not a ``significant rule'' under 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 summary of the costs to comply with this AD and 
placed it in the AD Docket. You may get a copy of this summary at the 
address listed under ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the Federal Aviation Administration amends 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. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

2010-13-09 CFM International, S.A.: Amendment 39-16340. Docket No. 
FAA-2010-0026; Directorate Identifier 2010-NE-03-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective July 26, 
2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to:
    (1) CFM International CFM56-5, -5B, and -7B series turbofan 
engines with stage 3 low-pressure turbine (LPT) disks part number 
(P/N) 336-002-006-0, installed with the following serial numbers (S/
Ns), DE255844, DE256388, DE256622, DE256623, DE256625, DE256627, 
DE256628, DE256631, and DE256637.
    (2) CFM International, S.A. has stated that none of these 
affected disk S/Ns were originally installed on any CFM56-5 turbofan 
engine, however, that disk P/N is certified for use on CFM56-5 
engines.
    (3) The -5 and -5B series engines are installed on, but not 
limited to, Airbus A318, A319, A320, and A321 airplanes, and the -7B 
series engines are installed on, but not limited to, Boeing 737 
series airplanes.

Unsafe Condition

    (d) This AD results from the discovery of a material 
nonconformity requiring removal of the disk before the certified 
disk life of certain stage 3 LPT disks. We are issuing this AD to 
prevent uncontained failure of the stage 3 LPT disk and damage to 
the airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance time specified unless the actions 
have already been done.

Removal of Affected Stage 3 LPT Disks From Service

    (f) Before accumulating 9,500 cycles-since-new, remove stage 3 
LPT disks from service.
    (g) After the effective date of this AD, do not reinstall any 
stage 3 LPT disk removed from service per paragraph (f) of this AD 
into any engine.

Alternative Methods of Compliance

    (h) The Manager, Engine Certification Office, has the authority 
to approve alternative methods of compliance for this AD if 
requested using the procedures found in 14 CFR 39.19.

Related Information

    (i) Contact Antonio Cancelliere, Aerospace Engineer, Engine 
Certification Office, FAA, Engine & Propeller Directorate, 12 New 
England Executive Park, Burlington, MA 01803; e-mail: 
[email protected]; telephone (781) 238-7751; fax (781) 
238-7199, for more information about this AD.
    (j) European Aviation Safety Agency AD 2009-0270, dated December 
17, 2009, also addresses the subject of this AD.
    (k) CFM International, S.A. Service Bulletin (SB) No. CFM56-5B 
S/B 72-0733, dated October 26, 2009, and SB No. CFM56-7B S/B 72-
0743, dated October 26, 2009, pertain to the subject of this AD. 
Contact CFM International, Technical Publications Department, 1 
Neumann Way, Cincinnati, OH 45215; telephone (513) 552-2800; fax 
(513) 552-2816, for a copy of this service information.

Material Incorporated by Reference

    (l) None.


    Issued in Burlington, Massachusetts, on June 15, 2010.
Peter A. White,
Assistant Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 2010-14819 Filed 6-18-10; 8:45 am]
BILLING CODE 4910-13-P

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