### 25970 Federal Register/VoL 73, No, gO/Thursday, May n, 200H/Rules fwd RegulaLions

by Ihis AD. w"lu~stile AD sp',eiries otbtJrwistJ. (1)TI1(l Dir~ctor ofU'OF\ld~l'<ll I{l,gis\or approvl!d lh!!il1l.:DrpOI·"lion hy l'of~rellccof Suow EngiJlep.ringCo. Servkll Le\ler 1t253. RI."'.C. dated '\]Jri! 17. 2008: Snuw Engin!>Cring

Co, Sen'ice Lclter #253. Hev. 1:1. dated November 30.2007: aud Suow Engineering Co. Snrvit.:l:! I.t!(l(lr #253 KIl".A. dated Octuber 15. 2007. unutlr 5 U.S.c. :i:';2Ia) and 1 eFR part 51. (2) On August 10, 2007 (n FR 36863, July 6. 2007). the Directur ofthe FedcT'~1 Kegister approved the incorpOT',llioll by mference of Snow Engin!!t'ring Co. Servicc Leiter 1t253, rl:!visedJanuary 22. 2007. (3)For service information identifit!d in this AD. contact AirTr,l(:tor Inc

.. P.O. Hox 485. Oloey. Texas 76374; telephone: (9•• 0) 564-5616: fax: (940) 564-5612. (4) You may review copies at the FAA. Central Region. Omce of lhe Regional Counsel. 901 Locust. Kansas City. Missouri 6~106; or at the National Archives and Records Administration INt\RA). For information on the availability ofthis materia! at NARA. (;<111202-741-6030.or go to hitp:! /www.orchives.gov/fcdf.lroCregiSler/ code_ofJL'!IcroCrcgu/o/ions/ ibr _Iocol/ulls./llm/.
Issued in Kansas City. Missouri. on April 30.2006. Palrick R. Mullen, Acting Managcr. Small Airplane Direclorote. Aircraft Certification Service. WI{Doc. £8-9925 Filnd 5-7-08; 8:'ili amI

BILUNG COOE 491ll--13-P

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39
[Dockel No. FAA-2007-28363; Directorate Identifier 2006-NM-180-AD; Amendment 39-15515; AD2008-10-09]

RIN2120-AA64

Airworthiness Directives; Boeing Model 737-100, -200, -200C, -300, --400, and -500 Series Airplanes

AGENCY:

Federal Aviutioll Administration (FAA). DOT,
ACTION:

Final rllln.

SUMMARY:

We are adopting a new airworthiness directive (AD) for all Boeing Model 737-100. -200, -20UC, -300. -400. and -500 series airplanes. This AD requires revising the FAAapproved maintenance program to incorporate new airworthiness limitations (AWLsl for fuel lank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. This AD also requires the initial inspection of

a certain repetitive AWL inspection to phase in that inspectiun. and repair if
necessary. This AD results from a design review ufthe fuel tank sy~tem, We ~re issuing this AD to prevent the potenti~l for ignition sources inside fuel hlllks caused by latent failures. alterations, repairs, or maintenance actions, which, in combination with flammable fuel
vapors, could result in a fuel tank explosion and consequent loss of the airplane.

DATES:This AD is effective June 12. 2008. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD

as of June 12. 2008.
ADDRESSES:

For service information identified in this AD, contact Boeing Commercial Airplanes. P.D. Box 3707, Seattle, Washington 98124-2207. Examining the AD Docket

You may examine the AD docket on the Internet at http:// www.regu/ations.gol/;orin perSOn at the Docket Managemenl Facility between 9

a.m. and S p.m .• Monday through Friday. except Federal holidays. The AD docket contains this AD, Ihe regulatory evaluation, any comments received. and other information. The address for the Docket Office [telephone 800-647-5527) is the Document Management Facility. U.S. Department of Transportation. Docket Operations, M-30. West Building Ground Floor. Room W12-140. 1200 New Jersey Avenue, SE., Washington, DC 20590.

FORFURTHER

INFORMATION

CONTACT;

Sue Lucier, Aerospace Engineer, Propulsion Branch, ANM-140S, FAA, Seattle Aircraft-Certification Office, 1601 Lind Avenue,·SW. Renton, Washington 88057-3356; telephone (425) 917-1WI8; fax (425) 917-6590.
SUPPLEMENTARY

INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 erR part 39 to include an airworthiness directive (AD) that would apply to all Boeiug Model 737-100, -200, -zooe. -300, -400. and -500 series airplanes. That NPRM was published in the Federal Register on July 6, 2007(72 FR 36907). That NPRM proposed to require revising the FAA-approved maintenance
program to incorporate new airworthiness limitations (AWLs) for fuel tank syslems to satisfy Special Federal Aviation Regulation No. 88 requirements_ That f\1J>RM also proposed
to require the initial inspection of a certain repetitive AWL inspection to phase in that inspection. and repair if necessary. A\:1ions Since NPRM Was Issued
Since we issuod the NI-'l\M, Boeing has issued Revision March 21108of the 737-100/Z00/Z00C/300/400/S00 Airworthiness Limitations (AWLs) and Certification Mainten(lnr:e Requirements (CMRs), D6-38278-CMR (hereafter referred to as "Revision March 2008 of Document 06-3827B-el\1R"). The NPRM referred to Revision May 2006 of Document D6-38278-el'vlR as the appropriate source of service information for accomplishing the proposed actions. Revision March 2008 uf Document D6-38278-CMR. among olher actions. includes the following changes:

• Removes the repetitive task interval of 36.000 flight cycles from AWLs No. 28-AWL-ol and No. 28-A WL--03.

• Revises the task description for AWl. No. 28-AWL-01to harmonize it with AWL No. 28-AWL-02 by removing references 10 certain station munbers.

• Revises AWL No. 28-AWL-03to reflect the uew maximum loop resistance values associated \,,-ilh the lightning protection of the unpressurized fuel quantity indicating system (fQ!Sl wire bundle installations. Accordingly. we have revised paragraphs (fl. (gl. and (h) ofthis AD to refer to Revision March 200<1of Document Do-38278-CMR. We also have added a new paragraph (j) to this AD specifying that actions done bdore the effective date ofthis AD in accordance with Revisions May 2006 through November 2007 of Document DG-38278-CMR are acceptable for compliance with the corresponding requirements of paragraphs (g) and (h) of this AD. We also have removed reference to 3['i,OUO total flight hours from pamgmph (h)(1) of this AD and revised the inilial tlueBhold for accomplishing AWL No. 28-A WL-03 to within J 20 monlhs since the dille of issuance of the original standard airworthiness certificate OJ'the di:lte of issuance of thB original export certificale of airworthiness. Opemtors should note that paragmph (g) of this AD requires only incorpor(lting AWLs No. 28-A WL-Ol Ihrough No. 28-A WL-20 inclusive for Model 737-100, -200, and -200C series airplanes, and AWLs No. 2B-A WL-01 through No. 28-A WL-19 inclusive for Model 737-300. -400. and -500 series airplanes, Revision September 2006 of Document D6-38278-CMR added AWL inspections of the fuel boosl pump auto shutoff system for the cenler aod auxiliary fuel tanks (specified as AWLs No. 28-A\'\'L-20 and No. 28-AWL-21 for Model 737-300, -400. and -SOD series airplanes. and AWLs No_ 28-

### Federal Register/Vol. 73, No. gO/Thursday, May 8, 200B/Rules and Regulations 25971

AWL-21 and No. 28-AWL-22 For Model n7-100. -WO, and -200G serie~ airplanes). Revision November 2007 of Document D6-38278-CMR added <In AWLinspection ofthe boost pump ground fault interrupter (specified as AWLNo. 28-AWL-22 forModel 737- 300. --400, and ··500 series airplanes, and AWLNo. 28-AWL-23 for Model 737-100. -200. and -ZOOC series airplanes). We might issue additional rulemaking to require the incorporation ofthose AWLs. I-Iowevor,as an optional Ilttion, operators may incorporate those AWLs as specified in paragraph (glof this AD.

Other Changes Made to This AD

For standardization purposes, we have revised this AD in the following ways:

• We have added a new paragraph lil
to this ADto specify that no alternative inspections, inspection intervals, or critical design configuralion contra! limitations (CDCCLs)may be used unless they arc part ofa later approved revision ofRevision March 2008 of Document D6-38278---CMR,or unless they are approved as an alternative method ofcomplinnce (AMOC). Inclusion ofthis paragraph in the AD is intended to ensure that the AUmandated airworthiness limitations changes are trealed the same as the airworthiness limitations issued with the original type certificate.

<> We have revised Note 1 ofthis AD to clarify that an operator must request approval for an AMOC ifthe operator cannot accomplish the required inspections because an airplane has bermprroviollslymodified, altered, or repaired in the areas addressed by the required inspeclions.

• We have revised paragraph (hl of this ADto specify that accomplishing AWLNo. 2B-AWL-03 as part ofan FAA-approved maintenance program before the applicable compliance time constitutes compliance with the applicable requirements ofthat paragraph.

<> We: have deleted Appendix 1 and Appendix 2 from LhisAD. sillce Revision March 2008 ofDocument 06- 38278-CMR already contains most of the updated information that is listed ill those appendices ofthe NPRM.

Commenls

Wegave the public the opportunity to participate in developing this AD. We considered the comments rel..'eivedfrom the Fivecommenters. Request To Revise the Loop Resistance Values for AWLNo. 28-AWL-03 Uoeing, KLMRoyal Dulch Airlines {KJ.M}, and Lufthansa state thaI the loop resistance values for AWLNo. 28- AWL-03 specified in Revision May 2006 ofDocumenl OG-38278--CMf{ are going to be revised, since those values

are relevant forproduction airplanes. The commenters also slate that the revised valucs will be more representativc oftne expected values for in-service I,lirplanes. Boeing points out thal, according to paragrilph (h) orthe NPRM,the revised values should be able to be used in accordance with a later revision ofthe CMRifthe revision is approved by the Seattle Aircraft Certification Office (ACO),FAA. We agree that operators may use the revised loop resistance values forAWL No. 28-AWL-D3 in accordance with Revision March 2008 ofDocument D6- 38278-CMR. As stated previously, we have revised this AD accordingly. Ruquesl To Revise intervals for Certain AWL Inspections KLM, on behalf of several operators, requests that we review a 45-page proposal to align certain airworthiness limit<ltion item (ALl)intervals wHh tbe applicahle maintenance significant item (MSl) and enhanced zomll analysis procedure (EZAPl intervals forModel 737,747,757,757. and 777 airplanes. The recommendations in that proposal

ensure that the ALl intervals align with the maintellance schedllles ofthe operators. Among other changes, the proposal recommends extending certain AWLinspection intervals from ]0 yearsl 36,000 flight cydes to 12 years for Model 737-100,-200,-300,-400. and -500 series airplllncs. Lufthansa and the Air Transport Association [ATAl, on behalf ofits member U.S. Airways, both note an inconsistency between the inspection interval specified in Revision May 2005

orDocLUTIent

1J6-3B2 78-CMR ilnd the wmpliance threshold specified in paragraph (b){l) ofthe NPRM. The NPRM specifics accomplishing the initial inspection within 36,000 !otal f1ighthours or 120months since the date of issuance ofthe original standard airworthiness ctlrtificate or the date of issuance ofthe original exporl certificate ofairworthiness, whichever

occurs first. However, Revision May 2006 ofDocument D6~38278-eMR specifies fl repetiti ve interval of36,000 lotall1ighl cycles Of120 months. whichever occurs firs!. U.S. Airways requests we verify whether the initial inspection interval should be in units of f1ightcydes or flight hours_ We disagree with KLtvrsrequest to extend cerlain AWLinspection intervab
to 12 years. However. as stated previously, we have deleted the 36.000- total-flighi-houf parameter from paragraph (h)(1) ofthis ADto correspond with the task interval for AWLNo. 28-AWL-03 as specified in Revision Miuch 2008 ofDocument D6- 3-8278-CMR.In developing an appropriate compliance time forthis «cUon. we considered the urgency associated with the subject unsafe condition and the practical (lspeet or accomplishing the required actions within a period oftime that corresponds to the normal scheduled maintenance for mas! affected operators. However, according 10the provisions ofparagraph (kl ofthis AD, we might-approve requests to adjust the compliance time ifthe request includes datil that prove that the new compliance time would provide an acceptable level ofsafety. Request To Revise Note 1 Boeing requests LIlat

we revise Note 1 ofIhe NPRM to clarify the Ileed rOf im AMOC. Booing stales that the current wording is difficult to follow, and that the note is meant to inform operators that an AMOC to the required AWLs might be required if all operfltor has previously modified, altered, or repuired the areas addressed by the limitations. Boeing requests that we revise Note 1 as follows:

• Add the words "according to paragraph {gr' at the end ofthe first sentence.

<> Replace the words "revision to" with "deviation from" in the last senhmce.

•• Delete the words "(g) or" und "as applicable" from the last sentence. As stnted previously, we have clarified the language in Note 1 ofthis AD for standardization with other similar ADs. The language the commenter requests' that we change does lIot appear in the revised notc. Therefore. no additional change 10this AD is necessary in this regard. Request To Extend the Grace Period for AWL No. 28-A WL-03
KLMexpects to have problems accomplishing the initial inspection of AWLNo. 28-AWL-03 wit.hinthe 24- month grace period. The commenter states that ifit docs the check and does not reach the specified values, then tank entry ontside ofheavy maintenance would be neceSS<lrv,

The commenter aiso slates that it \~ould be helpful Lo plan 10do this inspection during all overhaul. We infer that KLMrequests that we extend the grace period forAWLNo.

### 25972 Federal Register/Vol. 73, No. 90/ Thursday, May 8, 2008/Rules and Hegulations

28-AWL-03 in paragraph [h) ofthis AU to allow accomplishing the initial inspection during 11 regularly scheduled "0" check [about 6 years). We disagree with extending the grace period to 6 years. In developing an appropriate complillnCe time forthis actioll, we considered the safety implications, the rate oflightning strikes in the !"leel,and the average age ofthe Deet. In consideration ofthese ilems, we have determined that ao initial compliaoce time of 120 months (as discussed previously) with a grace period of24 months will ensure an acceplable level of safety. We have oot changed the grace period for A\II'LNo_28-A WL-Q3 in this regard. Request To Add Applicability 10 Paragraph [g) Lufthansa slates that the applicability ofthe AWLtasks should be included in the AWLtable ofthe AD. We infer the Gommenter requests that

we indude the app!icability forAWL No. 28-A Wr.-0::1in paragraph [g) ofthis AD_[The comm(;ot~r mad(; the same request for a similar NPRM,which contained an "AWL table.") We agree to add the airplane applicability to paragraph (g)oflhis ADbecause AWL No. 28-AWL-03 only <lppliesto airplan8s on wbich cfJrtaindesign changes have been incorporated. We have revised paragraph [g)ofthis AD accordingly. Request To Clarify Need for AMOCs The ATA, on bahaH 01' its member U.S. Airways, requests that we clarify whether operators must obtain AMOCs forAWls that are not applicable to their airplanes. U.S. Airways also requests that we clarify that some ofthe items idenlitled in Appendix 2 ofthe NPKM might not be flpplicflble to flllModel 737-300. -400. and -500 series airplanes. U.S. Airways states that it will not be able to comply with certain AWLinspections or CDCCLsbecause it has nol incorporated the relevant service bulletins identified in Revision May 2006 ofDocument D6-38278-CMR

on several ofits airplanes. Document D6-38278-CMR contains

an applicability column that identifies the airplaoc configuration to which the AWLapplies. The AWL is required only fOf those airplanes that have that configuration_ Ifthe applicability column identifies a service buHetio. then the operator would not need to adhere to the AWL until the airplane is modified in accordance WiUlthat service bulletin. There is no need to obtain an AMOC fOfairplanes that have not been modified. We agree that some ofthe items identifiod in Appendix 2 of thl:\NPRMmight not b~ Rpplicable to all Model 737-300. --400, and -500 series airplanes. However, no change to this AD is necessary in this regard, since we have deleted Appendix 2 from this AD. RilquestTo Clarify ifLatest Revision uf Ilucumcnl D6-38278-CMR is Required
The ATA, on behalf ofits member U.S. Airw<tys,requests that we clarify whether the latest revision ofDocument O£-38278-CMR will be incorponlted into lho final rule. The commenters note that Boeing has published a later revision ofDocument 06-38278-cMR than the one referenced in the NPR.\1. Wehave revised tbis ADto refer to the latest revision ofDocument Dfi3B278-CMR because paragraphs (g)and [h) ofthis AD allow the use oflaler approved revisions ofthat document. That document has been revised since then to include additional AWLs IIssociated with the incorporation of Gertaindesign changes. As stated previously, we might require those design changes and associated AWLs with separate rulemaking actions, but

ESTIMATED COSTS operators may choose to incorp0ri1tethe

new AWLs beForethon. Request To Clarify Revision Date of Document D6-38278--CMR
The ATA, on behalf ofits member U.S. Airways, notes that the "Changes to Fuel Tank System AWLs" and "Exceptional Shorl-Term Extensions" sections ofthe NPRMrefer to Revision M,;!fch2006 ofDocument 06-38278- CMR. U.S. Ainvavs believes that the correct revision date should be May 2006 to match the rtlst ofthe NPRM, We infer the commenters request that

we change the revision date to May 2006. We agree that the NPRM should have referred to Revision May 2006 of Document Oij-38278---CMR because that revision, and other later approved revisioos, are the subjact orthis AD. Revision March 2005 ofDocument 06- 38278-CMR was originally included in the NPRMbecause the AWLs for fuel tank systems were first incorpordted in that document. However. we have not changed this AD since the paragraphs that lhe commenters refer to are not retained in the final rule_
Conclusion
We reviewed the relevant data, cOllsidered the comments received. and dettlrmined Lhat~ir safety aod the public interest require adopting the AD with the changes described previously. We also determined that these changes will not increase the economic burden

on any operntOl'or increase the scope of the AD.
Costs ofCompliance
There are about 2,::137 airplanes ofthe affected design in the worldwide Ileel. The following table provides the estimated costs. ol an avernge labor fatc ofS80 per work hour, for U.S. operators to comply with this AD_

Costperair· Number of Action Work hours Parts U.S.-registered Fleetcost plane airplanes

Maintenance

programrevision

------- ....-_. ... ._-------_ ..... B None

........... 5640 672 $430,080 Inspection

- --.- ......- ...... .....

_..... B None

........... 6'0 672 430,080

Authority for This Rulemaking

Title 49 ofthe United States Code specifics the FAA·s authority to issue rules on ,lviation safety. Subtitle I. section 106. describes the authority of the FAA Adminjstrator. "Subtitle VII: Aviation Programs"· describes in more detail the scope ofthe AgenGY's fluthority. We are issuing this rulernaking under the authority described in "Subtitle VII, Part i\, Subpart III. SeGtion 44701: General requirements." Under that ~eclion, Congress charges the [o'AA with promoting safe night orcivil aircraft in air commerce by prescribing regulations forpractices. methods. aud procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope ofthaI authority because it addresses an unsafe condition that is likely to exist or develop 011 products identified in this rulcmakiog action. Regulatory Findings This AD will not have federalism implications under Executive Order

### Federal Register I

### Vol. 73, No. 90 I

### Thursday, May 8, 20081 

### Rules and Regulations 25973

1::1132.This AD will not have a Sllbstantiai direl:! effect on the Slales, on the relationship between the national government and 1he Stales, or on the distribution of power and responsibililies among the various levels of government. For the reasons discussed above, I certify that this AD: (Ills not a "significant regulatory action" under Executive Order 12866, (2) Is not a "significant rule" under DOT Regulatory Policil;!s and Procedures (44 FR 11034, February 26, 1978), and (3) Will not have a significant economic impact. positive or negati've,

on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. You can find our regulatory liWaluatioll and the estimated cus!s of compliance in the AD Docket.

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incurporalion by reference, Safety. Adoption ofthe Amendment

I'll Accordingly, underlhe authority delegated 10 me by Ihe Administrator. the Fi\A amends 14 CFRpart 39 as j'ollov\i~:

PART 39-AIRWORTHINESS DIRECTIVES

.1. The authority citation for part 39 continues to read as follows: Autbority: 49 U,S.c. 106[g),40113, 44701.
§39.13 [Amended] .2. The FAA amends § 39.13 by adding the following now AD: 2008-10_mt Uo~in:::; AmsndmenI3g-1~51S. OocketNo. I'AA-2007-283i!3: Directorate Identifier ZOO6-NM-180-AD_
F.ff~ctiveDate {a)This airworthiness directive (AD)is errective June 12. Z008.
Affected Ails (bJ NOIll.!. Applicability (c}This ADapplies to all HoeingModel 737-100, -zOO, -200C, -300, -400, and -500 series airplanes, cnrtificalcd in allYcategory. Note 1: This AD rtlquirtls revisions to certain operalor maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(cj. For airplanes that have been previously modified, altel'lJd.or repilired in tile IJre,IH

uddre~~cd by these inslJllcllons, the operator may nol be abl~ 10accomplish lh~ inspections described in lhe revisions. In this situation. 10cumply wilh 14CFI{91.403{c). lhe operator must request approval for an alternative method ofeompliance (AMOC) according to parilgraph (k)ofthis AD.The reqlle~t should include a description of ch<ll1ges lo Llie reqllil'ed inspections Lhillwill

ensure the contillued operational safeLyor the airplane.

Unsafe Condition (d) This AD results froUla design review ofthe fuellallk systmus, We are issuing this ADLo prevonl the pOlential forignition

sources inside fuel Lankscaused bv latent failures. alterations. repairs, or maintenance aclions. which, in combination with flammable fuel vapors, could resulLin a fuel tank l:lxplosiolland consequent loss ofthe airplane. Compliance (e) You are responsible for having the actions required by this AD perfonned within the compliance Limesspecified, unless the actions have alniildy been done.
Service Infilrmation Reference [I)The Larm"Revision March 2008 of Document D6-38278-GMR." as used in this AD, means !Joeing 737-tOO/200/200Cf3001 400/500 Airworthiness Limitations IAWLs) and Certification MaIntenance Requirements (CMKs),D6-38278-{;MK ROl"ision March 2001l.
Maintenancll Prollram Revision 19} Before December 16, 2008, revise the FAA.approved mai/ltenancl:lprogram 10 im;orporate the information specified in )l:u'agrflph(g)(l) or (gI(2)ofthis AD, as applicable: excepl thal the initial inspElction required by paragraph [hl of\JlisAD must be done allhe applicable compliance time specified in that paragraph.hccomplishing the revision in accordance with a later revision ofDocument D6-38278-GMR is an acceptable method ofcompliance ifthe revision is approvad by the Manilger, SeajJle Aircraft Certification Office IACO),FA,\. {l} For Model 737-100. -200, and -zOOC series airplanes: Section C. "FUEL SYSTEMS AIRWORTHINESSUMITATIONS," induding AWLs No. 28-AWL-Ql through No, ZfI-AWL-20 inclusive, ofRcvisioll March 2006 ofOoCliment D(l-3827S-eMK As an optional action. A\'VLsNo. 28-AWL21 through No. z8-AWL-23 inclnsive. as idllntified in Section C ofRc\'ision March 2008 ofDocuwenLl)6-38276-G."lli., also may bEl incorporated into the FAA-approvtld mainlenanCl:lprogram. (2) For Model 737-300, -400, and -500 series airplanes: Section C, "FUEL SYSTEMS AlRWORTI1LNESS

Llli1rrATIONS,'· including AWLs No. 28-AWL-01 through No. 28-AWL-19 inclusive, Revision March 2008 ofDocument D6-38278-GMR, As an optional iKlion, ,\WL~No. 28-AWL-ZQ through No. 28-AWL-22 inclusive. as identified ill Section CofRevision March 2008 ofDocumenl D6-38278-CMR, also may be incorporated into the FAA,appro\'cd maintenance program.
Iniliall"~IH~ction and Rel'air ifN"cus~ary (It)For the airplunes identified in tbe "Appli<.'ability·· column ofAWLNo. 28- AWL-Q3 ofSection C ofRevision March 2008 ofDocumentlJ6-38276-CMR: Atthe later ofthe compliance times specified in paragraphs (h)(l} and ihl[2) ofthis /\0, du a special detailed inspHclion oftile lightninl\ 5hield lo ground l<ll1lJin.\tion on Lhe[Jut-ut'- lauk fuel quantil)' indil;ution syslem (l'QISJ wiring to verify functional integrity. in accordance with AWLNo. 28-.'\WL-Q3of Soction C ofRevision March 20011 of Document D6-38278-CM.R Ifany dlscrepancy is found during the inspection, repair the dis~repan~y hefore furllWrnighI in accordance with AWLNo. 28-AWL-Q3of Section C ofRevi~ion March J,001l of Documeot D6-38278-CMR. Accomplishing the actions required by this paragraph in accordauce with a later revision ofUoe-limen! UG-38278-CMl{ i~an ut:ceptable method of compliance ifthe revi.sinn is <lppro\'edby the Manager, Seattle ACO.iAccomplishing AWL No. 28-A\VL-Q3as-part ofan FAA-<lpproved maintenance program btlfofethe applicable compliance time specified in panlgraph (h)[ll

or (hJ(2) ofLhisADconstitutes compliance with the requirements ofthis pU.mgraph. Noh~2: For Ihe purpOSIl~ ofthis AD,
~ special detailed inspection is: "An intensive examination ofa specific item, installation,

or assembly Lodetect damage, faHure,or irregularity. The examination is likely 10 make extensive us",ofspeciali:.:ed insp()t:tion techniqu~s and/or equipment. Intricate cleaning and ~ubshmtiJlJaccess Dr disassemhly procedure may berequired." (t} Within 120 months sinca the date of issuance ofthe original standard airworthiness certification or the dale of i~suancfl oftho origi!lill flxporll:ertiuc,lte of airwtll'l.hiness, (2) \I.,'ithin24 months after the effective date ofIhis AD.

No Alternative Inspections, Inspection Intervals, or Critical Design Configuration Conlrol Limitations [CUCCLs) [i)After acr.omplisbing the actions specified in paragraphs [g)and lh) ofthis AD.

no alternative inspections, inspection 1. intervals, or CDCCLsmav be used unlllSSthe inspections, intervals, or·CDCCLsare parTOf

a later reVision ofRevision March 2008 of Document D6-38278-CMR thlll is apPJ,oved by the Manuger, Seattle ACO: ur llOlus~' the inspections, intervals, or CDCCLsareappro\'ed. as an AMOC in accordam:e with the procedlltl:ls specified in pardgrnph [k)of this AD.
Crudit for Actions Done Accurding to PrevIous Re\'biorls ofthe Service Information 

### OJ Actions done before the eff<!CIivll date of this ADin accordance with the Boeing 737- 1001200/200C/JOO/400/500 Airworthiness Limitations (AWLs] ilnd Certification Maintenance Hequil'elllents (CMRs).06- 38270-GMR, \{evisiun May 2006: Revision September 2006; or Revision November Z007;

are acceptable foreompliance with the corresponding requirements ofparagraphs (g) 2nd (11) ofthis AD.
Allernative Metbods ofComl'liance (AMOCsJ [k)(l} The M,wager. Seallie ACO. has the anthority to approvtl AMOCsforthis AU, if requested in accordance with the proc"dllres found in 1'1CI'R 39.19.25974 

### Federal Register/Vol. 73, No. gO/Thursday, May B, 200B/Rules and Regulations

(2)To request ~difforolltlllethud of compHance oradifferentcompliance time forthis AD. folluwthe procedures in 14CI'K J9.1~. Bo'!fort:

using any approved AMOCon any airplane Lo

whi(;hthe .•

\MOC applies. notlfyyour appropriate principal inspoclur {I'llillthe FA!\.FlightStandards Distrid Offi(;e[FSOU).or la(;kingaPLyour local F$DO.
MateriaLtn(;orporah~dbyR'lference
(I) You llJlI~l

use !:loeing 737-100/200/ ZIJOC!300/400/500

Airwmthinoss Limitations (AWLs)findCl~flmCil\iol\ Moinl~mlllC(l I{(~'!llil'em •• nts (CM1{s).

DG-3!l278-CMR, RuvisiollMarch 20GB,

to do tlll:! ~CIiOllS r~qllil"(ld bythis AD. 1I111

•• ss thflADspflcifies otherwiMl. (1)Th••Directoroftll(!FcrieralRl:!'tiister C1pproved

the incorporation byrefewnce of this service information under 5 U.S.C. 552(a)aud 1 CFRpart 51. (21Forservice information identified in this I\D. r.ontactBoeingCummcrcial Airplanes. 1'.0. Box3707. Seattle. Washington 981H-2207. (3) Youmayreview copies ofthe service information im:urporntedbyreferE3nce at the FAA,Tramport Airplane Directorate, 1601 Lind :\venue, $W

.. !{I)nton, Washington;orat the N~lionalAI'l.:hi"f:!s

~Lllrl Records ArJministralioli (NAKAI.Forioformalion on lIlt)aVHihlbility

ufthis IllaleriiuatNARA,rull 20Z-741-[)(J30. or golO: http:// www.(Jn·h.v[ls.gov!ft!dr.roIJegis/er ! code J'fJedeml J~&uJ(J/jons! ibr jucal iuns .h/m/. issued iu Renton. Washington, allApril 29. 2008. AliBahrami, Manager. Trollsport Airplane Direclamte, .~;rr;mf/ Certification Service. 1Ft{ Doc.E8-9922 Filed5-7-oB; 6:45amI

BILUJIlG CODE 491D-l3-P

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39 [Docket No.FAA-2006-26710; Directorate Identifier2006-NM-147-ADj Amendmenl 39-15517; AD2006-1D-11]

RIN 2t20-AA64

Airworthiness Directives; Boeing Model 757 Airplanes AGENCY; Federal Aviation Administr<ltion (fAA), Department of Transportation (DOT). ACTION: Final rule.
SUMMARY;

Tile FAA is adopling a new airworthiness directivp. (AD) fOl'all Boeing Model 757 airplanes. This AD rcquirp.s re\'isillg the Airworthiness Limitations fA\'IlLs) section of the Instructions for Continued Airworthiness by incorporating new limitations fur fUl:l!

tank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. This AD also requires the initial inspection of certain repetitive AWL inspections to phase-in those inspections. and repair if necessary. This AD results from a design review of the fuel tank systems. We are issuing LhisAD to prevent the potential for ignition sources inside fuel tanks caused bv latent failures. alterations, repairs, O"r

maintenance actions, which, ill comhinaliull with flammable fuel vapors, could l'as\l1tin a fuel tallk explosion and conseqlleot loss ofthe llirplane. DATES: This AD becomes effective June 12.2008. The Director ofthe Federal Register approved the incorporation by reference of a certain publication listed in the AD

as offune 12, 2008. ADDRESSES:

For service information identified ill this AD, contact Boeing Commercial Airplanes, P.O. !:lox3707, Seattle, Washington 98124-2207. Examining the AD Docket
You may examine the AD docket on Ilw Internet at http:// wlVlV.l'egulorions.gov; or in person at the Docket Management facility 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 address for the Docket Office (telephone 800-647-5527) is the Document Management Facility, U.S. Department ofTransportation. Docket Operations. M-30, West Building Ground Floor, Room W12-140. 1200 New Jersey Avenue, SE., Washington, DC 20590. FORFURTHER

INFORMATION

CONTACT;

Judy Coyle, Aerospace Engineer, Propulsion Branch, ANM-140S, 

## rAA, Seattle Aircraft Certification Office. 1601 Lind Avenue, SW" Renton, Washington 98057-3356: telephone (425)917-5497: fax (425) 917-6590. SUPPLEMENTARY

INFORMATION:
Discussion The FAA issued a supplemental notice of proposed rulemakillg (NPRM) to amend 14 CFR part 39 to include an AD that would apply to all Roeing Model 757 airplanes. That supplemental NPR.i\ll was published in the Federal Register on August 1, 2007 [72 FR 41963). That supplemental NPRM proposed to requirl:J['evising the Airworthiness Limitations (AWL~) section of the Instructions for Continued Airworthiness (lCA) by incorporating

new limitations for fuel tank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. That supplemental NPRM also proposHd to require the initial inspection ofcertain repetitive inspections specified in the AWLs to phase-in those inspections. and repair if necessary. That supplemental NPRM also proposed 10 revise the original NPRf'..'1 by aligning the compliance time for revising the AWLs section with the complian(;e date of the special maintenance program requirements, updating the Iisling of applicable <lirptanc maintenance manuals in Appendix 1. (lud clurifying certuin ar.;tiOllS
Actions SinCll Supplemental NPRM Was Issued
Since we issued the supplemental NPRM, Boeing has issued Temporary Revision (TR) 09--008, dated M(lrch 2008. Bo{:illgTR 09-008 is published as Section 9 of the Boeing 757 Maintenance Planning Document (MPD) Document. D622NOOl-9, Revision March 2008 (hereafter referred 10as "Revision March 2008 ofthe MPO·'J. The supplemental NPRM referred 10 Revision Mill'ch 2006 of the MPD us the appropriale source of service informatioll for accomplishing tlw proposed "cliom. l\evision M:lI'I.:h 200S ofthe MPD. among other a(;tions, includes the following changes:

• Removes t.he repelitive task inlerval of 36,000 night cycles from AWLs No. 28-AWL--01, No. 28-AWL--03, and No. 28-A1NL-14.

• Revises the task description for l\WL No. 28-AWL--01 to harmonize it with AWL No. 28-AWL--02 by removing references to certain station numbers.

• Revises AWL No. 28-AWL-03 to reflect the new maximum loop resistance values associated with the lightning proLection of the unpresslll'i:wd fuel quantity indicating system (FQIS) wire bundle installations. Accordingly, we have revised paragraphs (fl, {gl, and (hl ofthis AD to refer \0 Revision March 2008 ofthe t\1PD.We also have added a new paragraph (j) to this AD specifying that actinns done before the llffective date of this AD in accordance with Revisions March 2006 through November 2007 of the MPD are acceptable for compliance with the corresponding requirements of paragraphs 

### (gl <lnd(11) of this AD. !;Ve also have removed refernn(;t! to 36.000 Lotalflight cycles from Table 1 of this AD and revised the initial threshold for acr:omplisl1ing AWLs No. 28·-I\WL01, No. 28-AWL-D3, and No. 28··I\WL14 to wilhin120 month~ since the d,lle of issuance ofthe original stlllldllrd airworthiness certificate or lhe datu of issuance ofthe original export certificate of airworthiness.