[4910-1 DEPARTMENT OF TRANSPORTA nON Federal Aviation Administration 14CFR Pa•.' 39 

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# 7'I'3 ID~c4et No. FAA-20**-++++; Directorate Identifier 2010-NM-174-AD; Amendm 

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# q R1N 2120-AA64 

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# .r-.-iU Airworthiness Directives; The Boeing Company Model 737-600, -700, -70De, -800, -900, and -900ER Series Airplanes AGENCY: Federal Aviatiol1 Administration (FAA), Department ofTransportation (DOT), ACTION: Final rule; request forcomments. SUi\'lMARY: The FAA is superseding an existing ainvorthiness directive (AD) that - I~

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applies to allModel 737-600, -700, -700C, -800, -900, and'-900ER senes airplanes, Th existing AD currently requires, forcertain airplanes, aone~time detailed inspection of t inboard and outboard aft attach lugs ofthe leftand right elevator control tab mechanisl fordiscrepancies, and replacement ofany discTpant elevator tab control mechanism. F certain other airplanes, the existing AD requires that the inspections be done repetitivel Replacing the elevator control tab mechanism lith anew Boeing-built mechanism tenninates the repetitive inspections inthe eXiS~ing AD. This new AD requires that modified repetitive inspections be done on all airplanes, regardless of accomplishment the temlinating action specified inthe existing AD. This AD results from reports of 

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failure ofthe aft attach lugs on the leftelevator tab control mechanism, which resulted il 'N"",""'OC;NA,lJf<f severe elevator vibration. This AD also results from reports ofgaps in elevator control OAf~ tab mechanisms and ill13lySiS that additional e+ator control tab mechanisms might hay bearings that will come loose. We are issuing trs AD to detect and CQITect discrepancies inthe aft attach lug ofthe elevator tab control mechanism, which could result in
FAA Form '360-14_' (6-89) OFFICIAL FILE COPY(4910-13-PJ

DEPARTMENT OFTRANSPORTATION Federal Aviation Administration ONCURR£"~(S ROUTING SYMaOL 

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ACTION: Final rule; request forcomments.

certain other airplanes, the existing AD requires that the inspections be done repetitively 

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# Nm;66 &b existing AD cun-ently requires, forcertain airp+es, a one-time detailed inspection ofth m inboard and outboard aft attach lugs ofthe left and right elevator control tab mec.banism 

# ovn;::fJ"'-4ct!3 for discrepanc.ies, and replacement ofany discrepant elevator tab control mechanism. Fo fS'it_ u"" Replacing the elevator control tab mechanism with anew Boeing-built mechanism AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). Ainvorthiness Directives; The Boeing Company Model 737-600, -700, -700e, -800, -900, and -900ER Series Airplanes 14CFR Part 39 39_H; AD 

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SUMMARY: The FAA is superseding an existing ainvorthiness directive (AD) that [Docket No. FAA-20**-++++; Directorate Identifier 201O-NM-174-AD; Amendme

. h ... . . I .. AD Th' AD . h A0/lL-Ioo5 termmates t erepetitIve inspectIOns 10tlCeXIstmg . ISnew reqUIrest at Nl modified repetitive inspeetions be done on all aJ]Jlanes, regardless ofaeeomplishment 0

# "e,iJ~'~ the terminating action specified inthe existing

# AD. This AD results from reports of OUTINGSY>tIl(ll. failure ofthe aft attach lugs on the leftelevator tab control mechanism, which resulted i severe elevator vibration. This AD also results fLm reports of gaps inelevator control I 

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INmAlS/S1G tab mechanisms and analysis that additional elevator control tab mechanisms might have ovnl"GsYHI\Ol. bearings that will come loose. We are issuing this AD to detect and correct discrepancie inthe aft attach lug oftl1e elevator tab control mLhanism, which could result in[4910-13-P)

DEPARTMENT OF TRANSPORTATION .~ederalAviation Administration ONCURltENCES OUTING$YMWl 14 CFR ParI 39 [Docket No. FAA-20**-++++; Directorate Identifier2010-NM-t74-AOj Amendme 

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R1N 2120-AA64 39-**; AD 

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~r)IlO fordiscrepancies, and replacement ofany discrepant elevator tab control mechanism. Fo NmAL5l5lG Airworthiness Directives; The Boeing Company Model 737-600, -700, -70DC, -800, -900, and -900ER Series Airplanes I AGENCY: Federal Aviation Administration (FAA), Department ofTransportation

inboard and outboard aft attach lugs ofthe leftand right elevator control tab mechanism existing AD currently requires, for certain airplanes, aone-time detailed inspection ofth } ACTION: Final rule; request for comments. SUMMARY: The FAA is superseding an existihg airworthiness directive (AD) that 9Uljn~Sytn applies to all Model 737-600, -700, -700C, -SOO) -900, and -900ER series airplanes. The

certain other airplanes, the existing AD requires that the inspections be done repetitively ATE' I Replacing the elevator control tab mechanism with anew Boeing-built mechanism ounNG SVMw.. terminates the repetitive inspections inthe existing AD. This new AD requires that modified repetitive inspections be done on all airplanes, regardless of accomplishment 0 An theternlinating action specified in the existing AD. This AD results from reports of OIfflWG sYMBOl. failure ofthe aft attach lugs on the left elevator tlb control mechanism, which resulted i NmAl.SISIG severe elevator vibration. This AD also results fr~m reports ofgaps inelevator control ATE tab mechanisms and analysis that additiC:nalelevator control tab mechanisms might have
~~~ bearings that will corne loose. We are issuinB this AD to detect and correct discrepancie inthe aft attach lug ofthe elevator tab control mechanism, which could result in