Airworthiness Directives; CFM International CFM56-2, -2A, -2B, - 3, -3B, and -3C Series Turbofan Engines

[Federal Register Volume 63, Number 118 (Friday, June 19, 1998)]
[Rules and Regulations]
[Pages 33530-33532]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-15785]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-ANE-46-AD; Amendment 39-10585; AD 98-12-32]
RIN 2120-AA64


Airworthiness Directives; CFM International CFM56-2, -2A, -2B, -
3, -3B, and -3C Series Turbofan Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to CFM International (CFMI) CFM56-2, -2A, -2B, -3, -3B, and 
-3C series turbofan engines, that requires a one-time eddy current 
inspection (ECI) for cracks or gouges in certain high pressure turbine 
rotor (HPTR) disks. This amendment is prompted by a report of a HPTR 
disk found to have a crack in a rim bolt hole during a routine shop 
manual ECI. The actions specified by this AD are intended to prevent 
the potential for an uncontained failure of the HPTR disk, which could 
result in an inflight engine shutdown, aborted takeoff, or damage to 
the aircraft.

DATES: Effective July 20, 1998.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of July 20, 1998.

ADDRESSES: The service information referenced in this AD may be 
obtained from CFM International, Technical Publications Department, 1 
Neumann Way, Cincinnati, OH 45215; telephone (513) 552-2981, fax (513) 
552-2816. This information may be examined at the Federal Aviation 
Administration (FAA), New England Region, Office of the Regional 
Counsel, 12 New England Executive Park, Burlington, MA; or at the 
Office of the Federal Register, 800 North Capitol Street, NW., suite 
700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: Glorianne Messemer, Aerospace 
Engineer, Engine Certification Office,

[[Page 33531]]

FAA, Engine and Propeller Directorate, 12 New England Executive Park, 
Burlington, MA 01803-5299; telephone (781) 238-7132; fax (781) 238-
7199.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) to include an airworthiness 
directive (AD) that is applicable to CFM International (CFMI) CFM56-2, 
-2A, -2B, -3, -3B, and -3C series turbofan engines was published in the 
Federal Register on January 22, 1998 (63 FR 3275). That action proposed 
to require a one-time eddy current inspection for cracks or gouges in 
certain high pressure turbine rotor (HPTR) disks in accordance with 
CFM56-2 Service Bulletin (SB) No. 72-817, dated January 14, 1997, 
CFM56-2A SB No. 72-419, Revision 1, dated January 31, 1997, CFM56-2B SB 
No. 72-561, Revision 1, dated January 31, 1997, and CFM56-3/-3B/-3C SB 
No. 72-843, dated January 14, 1997.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the comments received.
    Three commenters support the rule as proposed.
    Since issuance of the proposed rule, CFMI has revised CFM56-2 SB 
No. 72-817, CFM56-2A SB No. 72-419, and CFM56-3/-3B/-3C SB No. 72-843. 
These revisions include an update of a HPTR disk serial number 
identified in Table 1. Therefore, since these SB revisions do not alter 
the proposed actions, this AD will include reference to CFM56-2 SB No. 
72-817, Revision 1, dated November 25, 1997, CFM56-2A SB No. 72-419, 
Revision 2, dated November 14, 1997, and CFM56-3/-3B/-3C SB No. 72-843, 
Revision 1, dated November 25, 1997, for the accomplishment of the HPTR 
disk inspections.
    In addition, this AD revises the compliance date requirement for 
CFM56-2, CFM56-3, -3B, and -3C engines to 45 days after the effective 
date of this AD.
    After careful review of the available data, including the comments 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule as proposed.
    There are approximately 276 engines of the affected design in the 
worldwide fleet. The FAA estimates that 100 engines installed on 
aircraft of U.S. registry will be affected by this AD, that it will 
take approximately 300 work hours per engine to accomplish the required 
actions, and that the average labor rate is $60 per work hour. 
Replacement parts, if required, would cost approximately $86,000 per 
engine. Based on these figures, and assuming that 16 of the inspected 
HPTR disks will require replacement, the total cost impact of the AD on 
U.S. operators is estimated to be $3,176,000. The manufacturer has 
advised the FAA that certain costs incurred from the inspection and 
replacement of parts affected by this AD may be borne by the 
manufacturer; therefore, the total cost impact of this AD to U.S. 
operators may be less than estimated by the FAA.
    The regulations adopted herein will not have substantial direct 
effects 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. Therefore, in 
accordance with Executive Order 12612, it is determined that this final 
rule does not have sufficient federalism implications to warrant the 
preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this action (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. A final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy of it may be obtained 
from the Rules Docket at the location provided under the caption 
ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    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

    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. Section 39.13 is amended by adding the following new 
airworthiness directive:

98-12-32  CFM International: Amendment 39-10585. Docket 97-ANE-46-
AD.

    Applicability: CFM International (CFMI) CFM56-2, -2A, -2B, -3, -
3B, and -3C series turbofan engines installed on, but not limited to 
McDonnell Douglas DC-8 series, Boeing 737 series, as well as Boeing 
E-3, E-6, and KC-135 (military) series aircraft.

    Note 1: This airworthiness directive (AD) applies to each engine 
identified in the preceding applicability provision, regardless of 
whether it has been modified, altered, or repaired in the area 
subject to the requirements of this AD. For engines that have been 
modified, altered, or repaired so that the performance of the 
requirements of this AD is affected, the owner/operator must request 
approval for an alternative method of compliance in accordance with 
paragraph (c) of this AD. The request should include an assessment 
of the effect of the modification, alteration, or repair on the 
unsafe condition addressed by this AD; and, if the unsafe condition 
has not been eliminated, the request should include specific 
proposed actions to address it.
    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent the potential for an uncontained failure of the high 
pressure turbine rotor (HPTR) disk, which could result in an 
inflight engine shutdown, aborted takeoff, or damage to the 
aircraft, accomplish the following:
    (a) Eddy current inspect for cracks or gouges in HPTR disks, 
Part Numbers 1475M29P01, 1475M29P02, 9514M69P01, 9514M69P04, 
9514M69P05, 9514M69P06, and 9514M69P09, with Serial Numbers listed 
in Table 1 of the applicable Service Bulletin (SB), as follows:
    (1) For CFM56-2 engines, in accordance with CFM56-2 SB No. 72-
817, Revision 1, dated November 25, 1997, within 45 days after the 
effective date of this AD.
    (2) For CFM56-2A engines, in accordance with CFM56-2A SB No. 72-
419, Revision 2, dated November 14, 1997, within 500 cycles in 
service (CIS) after the effective date of this AD, or by December 
31, 1999, whichever occurs first.
    (3) For CFM56-2B engines, in accordance with CFM56-2B SB No. 72-
561, Revision 1, dated January 31, 1997, within 500 CIS after the 
effective date of this AD, or by December 31, 1999, whichever occurs 
first.
    (4) For CFM56-3, -3B, and -3C engines, in accordance with CFM56-
3/-3B/-3C SB No. 72-843, Revision 1, dated November 25, 1997, within 
45 days after the effective date of this AD.
    (b) Remove from service HPTR disks found cracked or gouged, and 
replace with serviceable parts.
    (c) An alternative method of compliance or adjustment of the 
compliance time that provides an acceptable level of safety may be 
used if approved by the Manager, Engine Certification Office. 
Operators shall submit their request through an appropriate FAA 
Principal Maintenance Inspector, who may

[[Page 33532]]

add comments and then send it to the Manager, Engine Certification 
Office.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this airworthiness directive, 
if any, may be obtained from the Engine Certification Office.

    (d) Special flight permits may be issued in accordance with 
sections 21.197 and 21.199 of the Federal Aviation Regulations (14 
CFR 21.197 and 21.199) to operate the aircraft to a location where 
the inspection requirements of this AD can be accomplished.
    (e) The actions required by this AD shall be done in accordance 
with the following CFMI SBs:

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            Document No.                      Pages                 Revision                     Date           
----------------------------------------------------------------------------------------------------------------
CFM56-2 SB No. 72-817..............  1-2...................  1.....................  November 25, 1997.         
                                     3-12..................  Original..............  January 14, 1997.          
                                     13....................  1.....................  November 25, 1997.         
                                     14-19.................  Original..............  January 14, 1997.          
Total Pages: 19.                                                                                                
CFM56-2A SB No. 72-419.............  1-2...................  2.....................  November 14, 1997.         
                                     3-4...................  1.....................  January 31, 1997.          
                                     5-10..................  Original..............  January 14, 1997.          
                                     11-12.................  2.....................  November 14, 1997.         
                                     13-18.................  Original..............  January 14, 1997.          
Total Pages: 18.                                                                                                
CFM56-2B SB No. 72-561.............  1.....................  1.....................  January 31, 1997.          
                                     2.....................  Original..............  January 14, 1997.          
                                     3-4...................  1.....................  January 31, 1997.          
                                     5-19..................  Original..............  January 14, 1997.          
Total Pages: 19.                                                                                                
CFM56-3/-3B/-3C SB No. 72-843......  1-2...................  1.....................  November 25, 1997.         
                                     3-11..................  Original..............  January 14, 1997.          
                                     12....................  1.....................  November 25, 1997.         
                                     13-18.................  Original..............  January 14, 1997.          
Total Pages: 18.                                                                                                
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    This incorporation by reference was approved by the Director of the 
Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. 
Copies may be obtained from CFM International, Technical Publications 
Department, 1 Neumann Way, Cincinnati, OH 45215; telephone (513) 552-
2981, fax (513) 552-2816. Copies may be inspected at the FAA, New 
England Region, Office of the Regional Counsel, 12 New England 
Executive Park, Burlington, MA; or at the Office of the Federal 
Register, 800 North Capitol Street NW., suite 700, Washington, DC.
    (f) This amendment becomes effective on July 20, 1998.

    Issued in Burlington, Massachusetts, on June 5, 1998.
Mark C. Fulmer,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 98-15785 Filed 6-18-98; 8:45 am]
BILLING CODE 4910-13-U

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