### 17492 Federal Register/Vol. 66, Nu. 63/Munday, April 2, ZOOI/Rules and Regulations

DEPARTMENT OFTRANSPORTATION

Federal Aviation Administration

14 CFR Part 39
[Docket No. 99-NM-127-AO: Amendment 39-12159; AD2001--06-12]

RIN2120-AA64

Airworthiness Directives; Boeing Model 767Series Airplanes Powered by General Electric Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule,

SUMMARY: This amendment adopts a flew airworthiness directive (AD), applicable to r.ortain Boeing Model 767 serios airplanes powered by General Electric engines, that mquires modification ofthe nacelle strut a,nil wing stnH.:ture. This ;lnumdmout is promplecl 

### by reports indicating that the ar.:hlal operational loads applied to the nacelle are higher than the analytical loads thai were used during the initial design. Sucb an increase in loading can lead lo fatigue crnckillg in the primary
strut structllr8 prior to an airplane reaching its design service objective. Tbe actiolls specified by tbis AD are intended 10prevent fatigue cracking in tbe primarv strut stmcture and consequellt reduced structmal integrity 

### ofthe stmt.

OATES: Effective MClY 7, 2001. The incorporation by rderence of certain publications listed in the regulations is approved by the Director oflbe Federal Register a~ofMay 7. 200l. The inr.orpOl"Ationby reference ofa certain othur ptlbtication, as tisled in the regulations. wns approved previously by lhe Director ofthe Federall\egister as of July 24. 2000 (65 F'R37t143,June 19, 2000). The incorporalion by rdere[][:e of certilin other publications, as listed in the reguJations, was ilpproved previously by the Director ofthe Federal Register as ofOctober 17, 2000 (65 FR 58641, October 2. 2000). The incorporation by reference of certain other ptlblications, as listed in the regulations, was approved previously by the Director ofthe Federal Register as 01March 5, 2001 (66 FR d085, januHry 29, :WOl].
ADDRESSES; Tbe servic{-!infonnRlion referenced in this AD mav be obtained from Boeing CommerCial-Airplane Group, P.O. Box ::170'1, Seattle, Wnsbington 98124-2207, This information mav be examined at the FederaL Aviatioil Administration (F1\A), Transport Airplane Directorate, Rules Docket. 1601 Lind Avenue, SW" Renton, W~shington: or at the Office of the Federal Register, 800 North Capitol Street, NW" suite 700, Washington, DC.
FOR FURTHER INFORMATiON CONTACT; John Craycraft, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue. SW" RentolL Washington 98055-4056: telephone (425) 227-2782: fax (425) 227-1181.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 ofthe Federal Aviation Regulations (14 CFR part 39) to include an airworthines~ directive (AD) that isapphcablp. to certain Boeing Model 767 series airplanes powered by General Electric engin<lswas published in the Federal Register on October 10, 2000 (65 FR60126). Tbat action proposed to require modification oftbe n~celle strut and wing struchlre.

Comments
Interested persons have heen afforded

an opportunity to partjr.ipate in the making ofthis amendmeDt. Due consideration has been given 10the
comments received. Request To Reference Revised Service Information
One commenter requests that. the FAA revise parilgrapb (L)to reference Boeing Service Bulletin 767-54-0069. Revision 2, dated AugUSI31. 2000, in addition to Boeing Service Bulletin 767-54-0069. Revision 1, dated January 29, 1998, as
an acceptable source ofse,vice information for the applicaule requirement ofthat par<igraph. The FAA concurs witli the

commenter's request. Since the issuance oftile propo~al, the FA,\ has reviewed and approved Boeing Service Bulletin 767-54-0069, Revision 2, in connection ,vab AD2001-02-07, amendment 39- 12091 (SE,FR 8085, Januarv 29, 2001), That AD, among other thin:gs, requires ar.comp1i~hment ofthe actions in Boelng Service Bulletin ;67-54-0069, Revision 1 or Revision 2, Accordingly, paragriJph (b) ofIhis AD ha~ been revised to reference both Revisions] and 2ortllat service bulletin liS appropri~te sources ofservice information. Also, anew Note 4 has been added to tllis final rule, ,md subsequent notes have been reordered accordingly, to reference AD 2001-02-
07. Request To Delay Issuance ofFinal Rule
One commentcr rcq)lesls that the FAA delay issuance ofthe final rule until the airplane manufacturer bas revised Boeing Service Bulletin 767-54-0081, dated July 29, 1999. The commenter states that. while 'lccomplishing the proposed requirements, tbe commellter found numerous deviations from Boeing Servir;e Bulletin 767-54-0081 and its associnlerl service b\llletill,~. The commente!" states that issuing the final rule before the service bnlletin is revised would force operalors 10request alternalive lllel.bods ofcomplianr;e (AMOC's) to <'lddressthese deviations. The FA./\finds that achallge 10the final ruJe is necessary in this regard. but

we do not concur with the cOl11l11enler's request to delay issuance oflhis final rule, Hoeing Service Bulletin 767-54- 0081 is not schedtlled to be revised UTItil June 2001. and the FAA finds that, in view ofthe urgency oftbe unsafe condition addressed by lhis 1\D, it would be inappropriate to delay issnance ofthe fi.nnlrule to wail fOl; such ar[lvisioll oflhe servit.:eblllletin to become available. However, to relieve any bmden on opBrations due to necessary deviation~ fr.om!be service bulletin, the FAA rinds that it is appl'OpJ'illte to allow aBoeing Company Designated Enginoering Repr!;sentative (DER) 10approve AMOC"s. Accordingly, p,]f(lgraph (d] as it appeared in the proposed rule hilS bEienrevised in this final rule to include s1.lbparagrilphs (d)(l) and (d)(2). with parRgraph (cl)(l) containing all inform'ltion included in paragraph (d] of the proposed rule, and paragraph (d)(2) containing the information nbout approval ofAMOC's by aBoeing Company DER. Request To Give Credit for AMOC's
One commenter reqnests that AMOC's approved for AD 200D-12-17, amendment 3(J-11 ;95 (65 PR 37843, June 19. 2000), and f\D 2000-07-05, arnenrlment39-11659 (65 FR 18883, April 10, 2000), also be approved for this AD. The COl11menteris referring to certain requirements ofparagraph (b), as c:larified by Notes 2and:1, orthe proposed rule, wllich state that service bulletins required by those AD's ilre acceptable for compliance with the applicable actions required uy paragraph (b) oftbig AD. The FAA concurs with Lhe commenter's request. AMOC's approved for AD 2000-12-17 and AD 200lH}7- 05, as well flSthose approved for AD 94-11-02, amendment 39-1l918 [59 FR 27229, May 26, lU94}, and t\D 2001-02- 07 (which was mentioned above). are considered approved for compliance with the applicable actions required by paragraph (b) oflhis AD. Accordingly, a
new paragrapb (d)(:'l)h~s been l1ddedto this final rule to ~tate thnt AMOC"s approved fortll0se AD's are considered

### Federal Register /Vol. 66, No. 63/ Monday, April 2, 2001/ Rules and Regulations 17493

acceptable [aI'compliance \Nith paragraph (b) ofthis AD. R~quest To Clarify Flight Cycle Threshold Formula
One commenter requests clarification ofcerta in conditions for the use ofthe flight cyds threshold formula listed in Figure 1 ofBoeing Service Bulletin 757- 54-00[J1, dated July 29, HH19.Condition 2ofthe formula lists nine servlce bulletill~ that mlJstbe accompli~hed if the formula is to be used. The commellter specifically requests clarification ofthe compliance thresholds to accompllsh Uleactions described in those service hullelins. The
commenter point~ out thDlIllany 01'the listed service bulletins specify initial inspection thresholds thal will h1l\'e already pas~ed for some airplanes. The
commenter requests that the FAA revise tbe requirement to state th"t "the inspections should be accomplished prior to reaching the servicu bullelin threshold or 20 yef\r.~,whichever occurs later." The FAA (;oncw-s that it i8necessary to clarify the threshold for doing the service bulletins lisled in Condition 2 of the night cycle tlueshold formula, though we do not concur with tlle commenter's suggested change. The FAA conc\Us that the action~ in the listed service bulletins IllU8tbe done no later"than 20 years ~ince the date of delivery ofthe airplane for the formula
to apply. However, UleFAA does not

concur that the threshold sbould be 20 years siuce date ofdelivery or prior to the threshold listed in the service bulletin, whichever OCClirslater, The FAA finds tbat deferring accomplishment ofthe service bulletins beyond 20 years would not provide an acceptilble level oj"safety. Therefore, paragraph (a)(l) ofthis ADhas been revised to clarify that, forthe formula to be used, the :;ctions in the service bulletins rofenmced in Figure 1 must be accomplished no later than 20years sin(;e date ofmanufadure ofthe airplane. Request To Revise Com.pliance Time in Paragraph (a)(lJ
One commellter I"equests that the FAA revise the compliunce time in (laff1.graph (il)(l) to remove the refcrellce to 37,500 total flight cycles. The commenter states thalthe compliance time should be, "Prior to the airphmc * • * accllmul:;ting :W calendar years from the airplane initial delivery date, orhaving reached the night cycle threshold as defined by the flight cycle threshold formula desr.ribed in Figure 1 ofthe ~ervicc bullutin, whichever occur~ first." The COllllnenteI' stateg that Ihis revision would make the ADmore consistent with the scndee bulletin, becallse the flight cycle threshold formula take~ into accountlhe greater fatigue damage resulting from longerduration flights, The commenter states that the flight cycle count resulting from this formula is never greater than 37,500 flight cycles. and may be significantly less. The FAA does not concur ,vilh the commenter's request to revise paragraph (a)(1) ofthe AD. We acknovvledge that the wording and logic ofthe compliance times in the AD differ from those in Ule service bulletin, but we have determined that the compliance tim(>gin this AD and in th~ service hulletin are roughly equivalent forairplaneo flying longer-duration flights, For example, an airplane that nics routes that ave:rage 8 hours would reach the 20-year threshold before itreached the 37,50-0flight cycle threshold. Once the airplane has reached the 20-year tlHeshold, ifthe operator does not choose to do the requirements ofthis AD at that Ume, the operator would then have the option to

use the flight cycle lhreshold formula to determine the alternative Uuashold (provided that the criteria in Fig-clre1

are met). No change to the tinal rule is
neccssax:y in this regard. Request To Identify This AD as a Superseuure ofAD 94--11-02
One commenter requests that the FAA revisc the proposed rule to stale that this AD isa sup8~sedurH ofAD 94-11- 02. The COnlmenter status that Boeing Servir:e Bulletin 757-54-0069 was approved as an alternative method of compliance (AMOC) for the requirements ofthat AD. The FAA does not concur with the commenter's I'equest. This AD does not supersede AD 94-11-02 However, the FAA acknowledges that accomplishment ofBoeing Service Bullelill 767-54-00G9 docs terminatB the inspections t'equired by AD 94-11- 02, No cJlange to the final rule is
necessary in this regard. Request Tn Revise Cost Impact Information
One commenter requests lbat the FAA revise the proposed rule to more accurately represent the cost impact of this AD. The commenter states that the
costs estimated in the proposed rule do
not accurately rellect the actual costs that will be incurred by operators. The
commenter states thaI the actual time required to do Boeing Service Bulletin 7ll7-54-0081 is between 2.000 and 3,000 vvorkhours, and the time forthe assor.iated service bulletins is betwesn :140and 550 work hours. The FAA does not concur witb the commenter's request to revioe the estimate ofcost impact. The number of work hours necBssary to accomplish the required actions, restated below, is based on the information provided by the airplane manufDcturer in its service bulletins. Tllis number represents the time necessary to perform only the actions actually required by this ADth~ "direct" costs. The FAA recognizes that, in accomplishing the requircments ofany AD, operators may incur "incidental" costs ill Clddition to the "direct" costs. The cost analysis in AD rulemaking o.ctions. however, typically does not inch,de incidental cosls, 5u(;h

as planning time ortime necessitated by other administrative actions. Because incidental costs may vary significantly from operator to operator. they are almost impossible to calculate. No change to the final rule is necessary in tJlis regard. Request To Address Warranty and Reimbursement Issues

One commenter addresses its
comment to both Boeing and the FAA. The commenter makes several requests pertaining to warranty and cost reimbur8ement issues. The FAA finds that an airworthineos directive is not an appropriate vehicle to resolve these specific comments. The FAA does not involve itscHin contracnlOl issues between the airplanB (orparts) manufacturer end its cListomers. No change to the j\D can be made in this regard.

Conclusion
After cal'&flllreview oftllf!available data. including the comments noted above, the FAA has determined that air safety und the public interest require t11e adoptioll orthe rule with the changes pnwiously described The FAA has determined that these changes will neither illcrense the economic burden

on "ny operator !lor increase the scope ofthe AD.

Cas! Impact

Therc are approximately 381 Modei 7117series airplanes ofthe affected design ill the worldwide fleet. The FAA estimates that 159 airplanes ofU.S, regisl'ry will be affected by this AD, that itwill take approximately 1,006 work hours per airplane, including lime for gaining access "nd closing up, to accomplish the required modifications per Boeing Service Bulletin 767-54- 0081, and that the avenlge L'lborrate is $60 per work hour. Based on Ulese figures, the cost impact ofthis requirmnent. all U,S. operators is

### 17494 Federal Register! Vol. 66, No. ("i3 /Monday, April 2, 2001! Rules and Regulations

estimated to be $9,597,240, or S60,360
per air\,lane. It wi I take approximately 16 work hours per airplane to accomplish the required actions uescribed in Boeing Survice Bulletin 767-29-0057, iltan average lahor rate of560 per work hour. Required pmts will be provided ilt no cost by the <lirplane manufacturer. Based on Ihese figures, Ihe cost imp<lct ofthese actions on U.S. operators is estimated tohe $152.640, or $960 per airplane. Itwill take (lpproxim(ltely 106 work hours per airplane to accomplish the actions described in Boeing Service Bulletin 767-:53-00G9, fitalllJverage labor rate of$60 pel' work hour. Required parts wilJ be provided at no cost by Ihe airplane manufat..1urer. Based 011 these figures, the cost impact ofthe~e actions on U.S, operators is estimated tu be $1,011,240, or $6,350
per airplane. Because the actions described in this service bulletin are already required hy another [\Daction, lhis requiremeJlt adds no new COgtsfor flffected operators. It will take approximately 1 work hour per airplane to accompligh the actions dllscribed in Boeing Service Bulletin 7li7-54-008j, illan average labor rate of$60 per work llOLlr. Reqllired parts will be provided al no cost by the airplane manufactllHlr, SMell on these figures, the cost impact ofthese IJCtiOllSon U,S. operators is estimated to be $9,540, or $60 per airplilne. Itwill t<ih: approximately 4 work hourg per airplane to ilccomp1ish the actions described in Boeing Service Bulletin 71)7-54-00H8. Revision 1, at an average labor rate or S60 per work hour. Required parts win be provided at no cost by the airplane manufacturer, Based on these figures, the cOotimpact ofthese actions on U,S. operators is estimated to be $38,160, or $240 per airplane. It will take approximately 20 work hours per airplane to accomplish the actions described in Boeing Service Bulletin 767-54A0094, Revision 1, st all
average labor rate of$60 per work hour. Required parts will be p~ovided at no cost by the nirplane manufacturer. l3ascd on these Figures, the cost imp>lct ofthese actions on U.S. operators is ()stimateJ to u()S190,!JOO. or $1.200 per airplane. Beclluse the actions described in this service bulletin are already required by another AD action, this ['eqllirement adds no new costs fo! affer.ted oper;llors. Itwill t,lke approximately:5 work hOLliSper nirplane to accomplish the actiollo described in Boeing Service Bulletin 767-57-0033, Revision 2, <Itan average labor rate of $60 per work hour, Ba~ed on these figures, the cost impact ofthe,e actions on U.S. operators is estimated tobe $47,700, or $300 per airplane. Because the actions described in tbis service bulletin are already required by another AD action, this requirement adds no new costs for affected operi:ltors, Some operators may have ~ccolllpHsbed certain lllodit'icat.ions on

some or all ofthe airplanes in their fleets. while other operators may not have accomplished any ofthe modificatiom on any of the airplanes in their f1eets. The future cost impact of this AD may be reduced uelow the estimates provided ilbove if some airplanes have already been modified, The cost impact figures discussed above are based on assumptions that no operator has yet accomplished any oj' the requirements oftbis AD action, and thalno operulor would accomplish those actions in the future ifthis AD ',,'ere not adopted. The cost impact figures discussed in AD rulemaking actions represent only the Ume necessary to perform the specific actions actually required by the AD. These figures typically do not include incidental costs, such as the time required to gain Rccess and close up, planning time, or time necessitated by othe1 administrative actions. Regulatory Impact
The regulstions adopted herein will
not have asuustantial direct effect on the Stales. on the relationship between the national Government and the States.

or on the distribution 

### ofpower and responsibilities among the various levels ofgovernment. Therefore, it is determined that this final rule does not have federalism impLications'under Executive Order 13132, For the reasons discussed above. I certifv that tbis action (1) is no1 a "sigl11ficant regulatory action" under Executive Order 12!J6(i; (2) is not a "significant rule" under DOT Regulatory Policies and Procedures (44 FR 11034. February 26,1979); and (3) will !lot have a significant economic impact, positive or negative, 011fl substantiill number of small entities under the criteria of the Regulatory Flexibility Ar.t. Afinal evaiu(ltion ha, been prepilred for this action and it is contained in the Rules Docket. Acopy ofil may be obtained from the Rules Docket at the locat ion provided unoer the caption ADDRESSES.

List ofSubjucts in 14 CFR Pari 39 i\ir tnmsportation. Aircraft., Aviation safelv. Incorporation by reference, Safety. Adoption ofthe Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Auministration runends pa.rt 3D oft]1e Federal Avifltion Regulations (14 CFR pert 39) <IS follow~:

PART 39-AIRWORTHINESS DIRECTIVES

1. Tbe authority citation for part :19 continues to read ilSfol1ows:

I\uthority: 48 U.S.c. 106(g1. '101t:J, 44701.

§39.13 [Amended} 2. Section 39,13 is amenned by adding the following I1f;1W airworthiness direc;tive:

2001-06-12 Hoeing:Amendment, ~9-121 !;9. DockeL9S-NM-l27-AO. li.pplicilbility: 1',.'jodel 767 serie, airplanes powered byGenerllll:!ectric engines. linp, numbers 1through 663 incllJ.\iv~,c~l'li[icated inany c<,.legory.
Nole 1:This ADOIpplie~ toeach airptane identified inthe precedillg applicabilily provision, regardless ofwhether ilh"s been modIfied, altered, orrepaired intJ,,~ ill'"'' subject 10tho mquiremenLs of LhlsAIJ For ail'planas LhaL

have be~all1odil'ied,altered, or repaired so thatlhe porformance ofLhl! requimments ofthis AD is aHected, the ()wnerIOp~ralOrJllllstrequest approvul forall alternative method ofcomplianCB in accordance with paraljfoph (dJ(l) ofLhisAIJ. The request ~hould include an nssessmenlol the erfecLofthe modification, allel"ulion,or repair Ollthe uasafe condition addressed by thl~ AD~and, iflh" unsafo condiLionhas not been eliminated, the requesl should include ~FecifiGpropos"d adions toaddres~ iL. Compliance: Required asindicated, unl('S5 accomplishod previously. Toprevent f"tigu" ~rad-.ingin Lh"primary slrut structuro and con~equent reduGed struc:Luralintegrity ofthe ,trllt. accolllplish the following:
Modification [a)Modify the nacelle st.ruL Hndwing struclure onboLhthelell and righl sido~of theEirplan", in a~cord"nco wilh !:lor-ing Sel'viceBulletin 7G7-54-00ll1 dated Jllly 19, 1999, aLthe IHterofLho(imes specifi~d in paragraphs {al[l) ;:lIle!

(a)(2)ofIh;" Atl (1)Prior 10thom~CllmlllnLion of37.500 total !light cycles. orwithin 20years since dale ofmanufaclure, whichev«r occurs first. U3eoUlle optionHlthreshold formula d"scribAd inFigure lon page54ofllle servic;oll\dletin isHna(ceptuhl" alternative lO the 20-year Lhre,hold provided thallhe conditions spocifiod ioFigur« 1 ofLheservice bulletin are met. Fortbe oplional thre"hold fonnuia inFigure 'ltobe us~d. aClionsin Lh;, service bulletins lj"led il1ltem 2ofFigur" 1 lllustue ~ccomplislled nolafer tJlan20years since the airplane',; d8te ofmanUf8dure, (2)Within 3,lI(10

night cycles aftorIhe affective dale ofthis AD. (b)Prior toorcotlGuneIltly Wilhthe accomplishnwnl ofth" modification oftho

### Federal Regi.ster /VoL 66, No. 63/ Monday, April 2, 20011 

### Rules and Regulations ]7495

nacelle stnll and wing structure required by jlaragraph (a) oflhis AD; as specified in paragraph 1.D., T8ble 2. "Prior tirConcurrent Service B\,lle\ins," on pagp,8 ofIJoeing Service Bulletin 767-54-(J081. dated JL11y 2,J, 1UD\l;occomplish the actions speciJied iJl Boeing Service Bulletill 757-29-0057, daled Decomber Hi, H193: lloeing Service Bulletin 767-54-(JOG8, Re"ision 1, dated January 29, 1988, OrRBvisiCm2, d~IH<1 August oj, 2000; [toeing Service Bulleli,ll 767-54-0083, dated September 17, 1898; Boeing Service Bul10tin 757-54-0088, Revision 1, datsd July 28, 1990; Boeing Service fluiletin 767-54A0094, Revision 1,daled Soptember 16, 1989: alld Bo~ing ServiGil Bulletin 767~57-00S3, Revision 2. dated September 23, 1999; as appliL3ble, ill accorrLmce with lhose service blilletins.
Not" 2: AD 200D-1~-17, ?mendmenl39- 11795, require, accomplishment ofBooing Service Bulletin 767-,'j7-(JOS3, RevisioD 2, dated September 23, 19\19.f-iowm'8r, inspections ~Tldrework accomplished in 8ccurdanLe with Boeing Service Bullelin 7G7-:,7-(JOS3, Revision '1,dated Octob~r 31, 1996, ~rf!flcceptnb1u forcompliance with tbe "pplicable action, re(juired by pal'ligr~pb (b] ofthis AD
Note 3: i\U 2000-07-03, mnendment 39- 11659, requires ar:complishmeut ofHoeing Service !JtJllelin 757-54/\0084, daleu M~v 22, ]998,lllspections and rswork ' accompli,hsd in accordance with Boeing SSfvics Bullelin 7G7-54,\0094, dated May 22, 19\J8. are aCCf)plahle for compliance with the applicable RGtionsre'lll;wd by paragrepll (b) ofthis AD,

Note 4: 1\0 2001-02-07. amendment 39- 120U1, rCl)\Iirf'Sncromplishrnenl ofBoeing Servicn H"L1elin7G7~54-0009, Revision I. uated January 29, 1998, OrRevision 2, dalod Allgllsl 31, 2000, Inspections amI r~work accomp1i~hed in acr;ordance wilh those service bulletins ar" ar.c•• ptable fur compliance with L"te applicable actions reqllired by pawg,"ph (h) ofthis !\D.
Repairs (c)Ifuny damage to the airplane stru~ture i~found during lhe HccolHpl1shrnont ofthe lllDdificHtiofJ reqllired by pMagnlph (oj ofthis i\D, ,md tlw survke blliletin specifies to contact Booing for appropriate <,ction: 'Prior
to further night, I'op"il' in Jccol'dance will] a mdhod approved by the Manager, Seattle Ail'cra!'l C~rlifi(:ation Office (ACO), FA!\, or C1 Boeing Company Designated Engineering Represenlalive (DE:R)who has been authorized by the ICAAtumake such findings, FDrarepair method tobe approved by Ihe M'mager, Sen!tle ACO, as reqlli.red by tilis pnms"'ph, Ih[llvJ?nager's "ppwv"lleltpr rllUStspecifiedl)' ,ef",ence this AD,

Allemative Method .•llfCompliance (dJ(l) MI allernative m•• thod ofcomplianr.e 'oradjustment ofthe cOll1pliRnce lime I.h~t provides an acceplable level of s~fety mijYbo uosd ifapproved by I.hflManager. Seattle ACO, OpHrator, shall sllbmit their r~qlle~ls through an appropriate 1'I\A Principrd Maintenance !n'pector, who may add comments and thell ,end il \()the lvlanager, Seattle ACO. (2) An allernativs method ofcomplianr;e Ih~1pwvide5 ~11acceptable Ievol ofsafety may be med 1'01'

paragraph (a] ofthis AD, if itis approvud by

~Boeing Compijny DER who has been ~ul.hori~ed by thll FAA 10make such findings, (3) Alternative methods ofcompliance, approved previously ill accordance with :\D 2000-12-17, :unendmenl 39-11 7Q5:AI) 2000-07-05, amendmenl 39-11G59; 1\0 2001-[12-07, amendmenl 39-12091; and AD 94-11-02, amendment 39-89'l8; am Jpprov~d as allernaliv" methous of compliance with the applicable actions in paragraph (b) ofthis AO_
Note 5: in[llrm~tilln concerning the existencu of~pproved alter.native methods of compliance with th.isAD, ifany, may be oblainecl from LheSe~tl1e i\CO.
Special Flight Permits (e] SpBcial fiighl p"rmiL<;ffi"Yb~ is'll •• din accord<!IlC8with ~oCtiOllS21.197 amI 21.1D9 ofthe ['edsral Avialion Reglilations (1~ CFR 21.197 and 21.199J to oper<ltethe airplanr; to

a lo~alion where the requirement5 oflhis AD

can be accompLisbed, Incorporatioll by Referf!ll[;e (I)Except as required by paragr'lph [c) of this Pill, the aclion> shall be done in accordance with Boeing Sel'ViCB Bulletin 767-54-0031, dal~d July 29, 1999; 80Aing Selvic() Bulletin 767-28-0057. dated December 16. 188:): 130eingService Bulletin fo7-S4-t)lj!j9, Hevision 1, dated )alluarv 2(J, 199B. or Revision 2, dalecl /\ugllsl 31, iOOD: Boeing Service Bulletin 767-54-0083, dated SlIptember 17, 1988; B(ming Snrvico Bulletin 767-54-U088, Revision J. dated July 28, 1999: Boeing Service Bulletin 767-54A0094. Revisiolll, dated SeptemlJol' 16, 1988; and Boeing Service Bulletin 767-57-(J053, Revision 2, d~ted Septumber 23, 1999: 85 applkable, (1) The incorporation by reference of Boeing Service Bulletin 767-54-0081, dU1.ed July 29, 1999, is a],!pl'oved by the Dir~ctor of the Foderal Regist~r, in accordnnce with 5 lJ,S.G. 552(a) nnd 1 CFR part 51 (21The incorporation by refllrence of Boeing Service Bililetin 7G7-57-D053, J\evisioll 2, dated September 23. t999, WriS appwv"d previously by the Director ofth~ Federal Regi,ter as ofJuly 21, 2000 (65 FR 37843, June19, 2000), {31The incorporation by reference of Boeing Service Bulletin 767-29-0057, dated Dncember 16. 1993: Bo[)ing SlIrvice Bulletin 767-5~-0069, Revision 1, dated January 28, 1998; Iloeing Ssrvice illlilelin 767-54-0083, dated .':;eptember 17, 1986: ~nd Boeing Service BullNin 7fi7-54-0088, Revision 1, datlld July 29, 1998: WRSapproved previously by the Director ofthe Federal Register as of Oclober 17, 2000 (55 I'R 581';41.October 2. 2000), [1}The incorporation by reference of Boeing Service Bulletin 757~54---0069, Revision 2. dnted August :n, 2000; and lloeirtg Service Bnllelin 767-34A0094, Revision 1, dated September 16. 1999, was npprov\!<1previously by the Director ofthe Federal J{~gisler a~ofMarcb 5, 2001 (66 FR 8085. Ioflllary ZS,200'l). (5) Copies may be obtBineu lram Boeing Commercial Airplane Group, P,O, Box 3707, Seaule. Washington 91n24-2207. Copies nwy be inspe~led at the FI\A, Transporl Airpl~J1e Oire~torate, 1601 Lind Avonue, SW

.. R\!nlOll. Washi.ngton; or altho Office ofthe federal Register. 800 North Capitol Slro)e!,NW., suite 700, Wa,hinglon, DC.

Effective Daie (g) This amBndmenl bHcomes eff~dive lln May 7, 2001 jssued In J\entOl!. Washington, on MHrch 22,2U01. Donald L.Riggin, AcIiJlgMan(jg~r. ]'rrm>pDrl/lirpJrm" DilBclDrale, ;lircrafl Cel'Uficolioli 5<:11'1(;0, [FRDoe, 01-77Ul Fi.led :1-30-01, 8:45 ~ml

BllltNG CODE491o-tJ_P

DEPARTMENT OFTRANSPORTATION

Federal Aviation Administration

14CFR Part 39
[Docket No, 2000-NM-316-AD: Amendment 39-~2158; AD 2001-06-111

RIN2120-AA64

Airworthiness Directives; Airbus Model A330~301,-321, -322, -341, and ~342 Series Airplanes

AGENCY:Federal Aviation Administration, DOT.
ACTION:Final rule: request for comments,

SliMMARY:This amendment adopts a

new ainvort1Jiness directive (AD) that is applir.able to certain Airbus Model A330-301, -321, -322, -341, and -342 series ai.rplanes, This action re!']uires replacemetll of the eXisting fasteners on the vertical web of stringers 13 and 20 of both wings with inlerferenre f()stencrs. Tills action is necessary to pre\'ent faligue cracking of the wing bottom skin and vertical webs, which could result in reduced structural integrity of the wing, This action is intended to addre,ss the identified unsafe condition,
DATES: Effective April 17, 20m, The Incorporation by reference of Gertain publkations listed in the regulations is approved by the Director of the Federal Register as of April 17, 2001. Comments for inclusion in the Rules Docket must be received on DI'before May 2,2001.
ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA). Transport Alrplane Directorate, ANM-114. Attention: Rules Docket No. 2000-NM31o-AD, 1501 Lind Avenue, SVV

.. Renton, Washington 98055-4056, Comments may be inspected at llJis