DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2014-0521;DirectorateIdentifier2014-NE-11-AD]RIN2120-AA64AirworthinessDirectives;CFMInternationalS.A.TurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Noticeofproposedrulemaking(NPRM)./_j--[4910-13-P]SUMMARY:Weproposetoadoptanewairworthinessdirective(AD)forallCFMInternational(CFM)S.A.CFM56-7Bseriesturbofanengines.ThisproposedADwaspromptedbyadualenginethrustinstabilityeventthatresultedintheoverspeedandinflightshutdown(IFSD)ofoneengine.ThisproposedADwouldrequiremodificationoftheenginebyremovingfullauthoritydigitalenginecontrol(FADEC)software,version7BV4orearlier,installedintheelectronicenginecontrols(EECs)onCFM56-7Bengines.WeareproposingthisADtopreventathrustinstabilityevent,whichcouldleadtooverspeedandIFSDofoneormoreengines,lossofthrustcontrol,damagetotheengine,anddamagetotheairplane.DATES:WemustreceivecommentsonthisproposedADby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFederalRegister].ADDRESSES:Youmaysendcomments,usingtheproceduresfoundin14CFR11.43and11.45,byanyofthefollowingmethods:•FederaleRulemakingPortal:Gotohttp://www.regulations.gov.Followtheinstructionsforsubmittingcomments.•Fax:202-493-2251.• Mail: U.S. Department

of Transportation, Docket Operations, M-30, West Building Ground Floor, Room Wl2-140

, 1200 New Jersey Avenue SE., Washington

, DC 20590.

• Hand Delivery: Deliver

to Mail address above between

9 a.m. and
5 p.m

., Monday through Friday, except Federal holidays. For service information identified

in this AD, contact CFM International
Inc.

, Av iati on Operations Center,

1 Neumann Way, MID
R oom 285, Cincinnati, OH 45125

; phone: 877-432-3272;

fax: 877-432-3329

; email: geae.aoc@ge.com.

You may view this service information

at the FAA

, Engine

& Propeller Directorate

, 12 New England Executive Park, Burlington, MA. For information

on the avai

l ability of this material

at the FAA, call 781-238-7125. Examining
the AD Docket You may examine the AD docket on the Internet

at http: //www. regulations.gov

by searching
for and

l ocat

i ng Docket No.
F AA-20 14-0521;

or in pe r son at the Docket Management Facility between

9 a.m. and
5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory eval uation

, any comments received, and ot h er information.
The street address for the Docket Office (phone: 800-647-5527)

is in the ADDRESSES section. Comments will be available

in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aerospace Engineer, Engine Certification Office, FAA, Engine

& Propeller Directorate,

12 New England Execut
iv e Park, Burlington, MA 01803; phone: 781-238-7146;

fax: 781-238- 7199; email: barbara.caufie

ld @faa.gov.

2SUPPLEMENTARYINFORMATION:CommentsInvitedWeinviteyoutosendanywrittenrelevantdata,views,orargumentsaboutthisproposal.SendyourcommentstoanaddresslistedundertheADDRESSESsection.Include"DocketNo.FAA-2014-0521;DirectorateIdentifier2014-NE-11-AD"atthebeginningofyourcomments.Wespecificallyinvitecommentsontheoverallregulatory,economic,environmental,andenergyaspectsofthisproposedAD.WewillconsiderallcommentsreceivedbytheclosingdateandmayamendthisproposedADbecauseofthosecomments.Wewillpostallcommentswereceive,withoutchange,tohttp://www.regulations.gov,includinganypersonalinformationyouprovide.WewillalsopostareportsummarizingeachsubstantiveverbalcontactwereceiveaboutthisproposedAD.DiscussionWehavereceivedreportsofdualenginethrustinstabilityeventsonCFM56-7BturbofanenginesthatresultedinoverspeedandIFSDofoneengine.Theseresultedfromwater-bornefuelcontaminationofthefuelsupplycausingalagintheresponseofthecontrolvalveinthefuelmeteringunit(FMU).CFMhasimproveditsFADECsoftwaretohelppreventthelagintheresponseoftheFMUcontrolvalve,therebymitigatingthesethrustinstabilityevents.Thiscondition,ifnotcorrected,couldleadtooverspeedandIFSDofoneormoreengines,lossofthrustcontrol,damagetotheengine,anddamagetotheairplane.RelevantServiceInformationWereviewedCFMServiceBulletin(SB)No.CFM56-7BSIB73-0203,datedJune9,2014,andCFMSBNo.CFM56-7BSIB73-0204,datedJune9,2014.TheSBsdescribeproceduresfortheintroductionofnewFADECsoftwarefortheEECs.3FAA's Determination We are proposing this AD because we eva

l uated all the relevant information
and determined
the unsafe cond

i tion described previously

is likely
to exist or develop

in other products
of the same type design. Proposed AD Requirements This proposed AD would require modification

of the engine by removing FADEC software, version 7BV
4 or earlier

, installed

in the EECs on CFM56-7B engines. C ost
s of Comp liance We estimate that this proposed AD would affect about 2,921 engines installed
on airplanes
of U.S. registry. We also estimate that it would take about

1 hour per product

to comply with this proposed AD.
The average labor rate is $85 per h our. Based on these figures, we est imate the cost of the proposed AD on U.S. operators

to be $248,285. Authority
for this Rul

e making 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

i ssu ing this rulemaking under the authority described

in Subtitle VII, Part A, Subpart III, Section 44701: "Genera

l requirements." Under that section, Congre

ss 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 authorit

y because

it addresses

an unsafe condition that is likely to exist or develop

o n products identified

in this rulemaking action.

4Regu

l atory Findings We determined that this propo se d AD would not have federalism implication

s under Executive Order 13132. This proposed AD wou

l d 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
act

i on" under Executive Order 12866, (2) Is not
a "s ignificant rule

" under the DOT Regulatory Policie

s and Procedure

s (44 FR 11034

, February 26, 1979)

, (3) Will not affect intrastate aviation

in Alaska

to the extent that

it justifies mak

i ng a regulatory distinction,
and ( 4) 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. List of S ubj
e ct s in 14 C FR Part 39 Air transportation

, Aircraft, Aviation safety, Incorporation

by reference, Safety. T h e Pro po se d Ame

n d m e nt According

l y, 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 follow

s: Authority:

49 U.S.C. 106 (g), 40113,44701. § 39.13 [Amended) 2. The FAA amends

§ 39.13 by adding the following new airworthiness directive (AD):

5CFM International S.A.: Docket No. F AA-2014-0521; Directorate Identifier 2014-NE11-AD. (a) Comments Due Date We must receive comments

by [INSERT DATE 60 DAYS AFTER DATE OF PUBLICATION

IN THE Federal Register]. (b) Affected ADs None. (c) Applicability This AD applies
to all CFM International (CFM) S.A. CFM56-7B

ser ies turbofan engmes. (d) Unsafe Condition This AD was prompted

by a dual engine thrust instability event that resulted

in the overspeed and in -fl ight shutdown (IFSD) of one engine

. We are is su in g this AD to prevent

a thrust instability event

, which could lead to overspeed and IFSD of one or more engines, loss of thru st control, damage

to the engine, and damage

to the airplane. (e) Compliance (1) Comply with this AD within the compliance times specified, unless already done. (2) Within

6 months after the effective date ofthis AD, modify

th e engine by removing full authority digital engine control
(F ADEC) software,

ve r sio n 7BV
4 or earlier

, in stalled

in the electronic engine controls. (f) Alternative Methods

of Compliance (AMOCs) The Manag

e r , Engine Certification Office, FAA, may approve AMOCs

to this AD. Use the procedures found
in 14 CFR 39.19
to make your request. 6(g) Related Information (1) For more information about this AD, contact Barbara Ca ufield, Aerospace Engineer, Engine Certification Office

, FAA, Engine

& Propeller Directorate,

12 New England Executive Park, Burlington

, MA

, 0 1803; phone: 781-238-7751

; fax: 781-238- 7199

; email: barbara.caufield @faa .go v. (2) CFM Service Bulletin (SB) No. CFM56-7B
SIB 73-0203

, dated June

9 , 2014, and CFM No. SB CFM56-7B
SIB 73-0204, dated June

9 , 2014, which are not incorporated

by reference

in this proposed AD, can be obtained from CFM using the contact information

in paragraph (g)(3) of this proposed AD. (3) For serv ice information identified

in this proposed AD, contact CFM International
Inc.

, Aviation Operations Center,

1 Neumann Way

, MID Room 285, Cincinnati, OH 45125; phone: 877-432-3272

; fax: 877-432-3329

; email: geae.aoc@ge.com.

( 4) You may view this service information

at the FAA, Engine

& Propeller Directorate

, 12 New England Executive Park, Burlington, MA. For information

on the availability

of thi
s material

at the FAA, call 781-238-7125. Issued
in Burlington

, Massachusetts

, on September
25, 2014. Ann C. Mollica, Acting Directorate Manager, Engine

& Propeller Directorate

, Aircraft Certification Service.

7