AD 97-09-02R3

AD Final Rules - 970902R3.pdf
Copy URL
Document Versions
 Feedback
DetailsAttachments/Public Comments
AD Number:
97-09-02R3
Document Type:
AD Final Rules
Docket Number:
95-ANE-64-AD
Subject Heading:
Airworthiness Directives; CFM International (CFMI) CFM56-5C Series Turbofan Engines
Subject:
High pressure turbine rotor (HPTR) front shafts
Status:
Current
Citation:
Federal Register: September 9, 2004 (Volume 69, Number 174)
Citation Publish Date:
09/09/2004
Effective Date:
10/14/2004
Make:
CFM International, S.A.
Model:
CFM56-5C2 | CFM56-5C3/G | CFM56-5C4
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
97-09-02 R2
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
Automatic Zoom
Actual Size
Page Fit
Page Width
⁨50⁩%
⁨75⁩%
⁨100⁩%
⁨125⁩%
⁨150⁩%
⁨200⁩%
⁨300⁩%
⁨400⁩%
125%
of ⁨5⁩
1


[Federal Register: September 9, 2004 (Volume 69, Number 174)]


[Rules and Regulations]


[Page 54557-54558]


From the Federal Register Online via GPO Access [wais.access.gpo.gov]


[DOCID:fr09se04-1]


–––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. 95-ANE-64-AD; Amendment 39-13791; AD 97-09-02R3]


RIN 2120-AA64


Airworthiness Directives; CFM International (CFMI) CFM56-5C Series Turbofan Engines


AGENCY:
 
Federal Aviation Administration (FAA), DOT.


ACTION:
 
Final rule; request for comments.


–––––––––––––––––––––––––––––––––––


SUMMARY:
 
This amendment revises an existing airworthiness directive (AD) for CFMI CFM56-


5C series turbofan engines. That AD currently establishes new life limits for certain high pressure


turbine rotor (HPTR) front shafts, HPTR front air seals, and booster spools. This action removes the


booster spool, part number (P/N) 337-005-210-0, and the HPTR front shaft, P/Ns 1498M40P03,


1498M40P05, and 1498M40P06, from the parts listed with lowered life limits in the existing AD.


This amendment results from a life management review completed by the manufacturer. We are


issuing this AD to prevent low-cycle fatigue (LCF) failure of certain HPTR front air seals, which


could result in an uncontained engine failure and damage to the airplane.


DATES:
 
Effective October 14, 2004.


We must receive any comments on this AD by November 8, 2004.


ADDRESSES:
 
Use one of the following addresses to submit comments on this AD:


•
 
By mail: Federal Aviation Administration (FAA), New England Region, Office of the Regional


Counsel, Attention: Rules Docket No. 95-ANE-64-AD, 12 New England Executive Park, Burlington,


MA 01803-5299.


•
 
By fax: (781) 238-7055.


•
 
By e-mail: 9-ane-adcomment@faa.gov.


You may examine the AD docket at the FAA, New England Region, Office of the Regional


Counsel, 12 New England Executive Park, Burlington, MA.


FOR FURTHER INFORMATION CONTACT:
 
Robert Green, Aerospace Engineer, Engine


Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park,


Burlington, MA 01803-5299; telephone (781) 238-7754; fax (781) 238-7199.
2


SUPPLEMENTARY INFORMATION:
 
On March 19, 2003, the FAA issued AD 97-09-02R2,


Amendment 39-13094 (68 FR 14312, March 25, 2003). That AD reduces the LCF retirement lives of


certain HPTR front shafts, HPTR front air seals, HPTR disks, booster spools, and LPTR stage 3


disks.


Actions Since AD 97-09-02R2 Was Issued


After we issued AD 97-09-02R2, the manufacturer conducted an extensive life management


program for the HPTR front shaft and booster spool listed in the AD. The results indicated higher


LCF retirement lives for those HPTR front shafts and booster spools than the lives published in AD


97-09-02R2. Those LCF retirement lives are now the same as originally calculated and are in


agreement with the current airworthiness limitations section of Chapter 05 of the CFM56-5C Engine


Shop Manual, CFMI-TP.SM.8. This AD revision removes HPTR front shafts, part numbers (P/Ns)


1498M40P03, 1498M40P05, and 1498M40P06; and booster spools, P/N 337-005-210-0, from the


parts listed with lower LCF retirement lives. The LCF retirement lives of the HPTR front air seals


P/N 1523M34P02 and 1523M34P03 remain unchanged.


FAA's Determination and Requirements of This AD


Although no airplanes that are registered in the United States use these affected engine models,


the possibility exists these engine models could be used on airplanes that are registered in the United


States in the future. This AD requires the LCF retirement lives of HPTR front air seals P/N


1523M34P02 and P/N 1523M34P03 to remain as published in AD 97-09-02R2.


FAA's Determination of the Effective Date


Since there are currently no domestic operators of this engine model, notice and opportunity for


public comment before issuing this AD are unnecessary, and a situation exists that allows the


immediate adoption of this regulation.


Comments Invited


This AD is a final rule that involves requirements affecting flight safety and was not preceded by


notice and an opportunity for public comment; however, we invite you to submit any written relevant


data, views, or arguments regarding this AD. Send your comments to an address listed under


ADDRESSES. Include ''AD Docket No. 95-ANE-64-AD'' in the subject line of your comments. If


you want us to acknowledge receipt of your mailed comments, send us a self-addressed, stamped


postcard with the docket number written on it; we will date-stamp your postcard and mail it back to


you. We specifically invite comments on the overall regulatory, economic, environmental, and


energy aspects of the rule that might suggest a need to modify it. If a person contacts us verbally, and


that contact relates to a substantive part of this AD, we will summarize the contact and place the


summary in the docket. We will consider all comments received by the closing date and may amend


the AD in light of those comments.


We are reviewing the writing style we currently use in regulatory documents. We are interested


in your comments on whether the style of this document is clear, and your suggestions to improve the


clarity of our communications with you. You may get more information about plain language at


http://www.faa.gov/language
 
and
 
http://www.plainlanguage.gov
.