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DEPARTMEI''o'T OF TRANSPORTA nON 

### Federal Aviation Administration 14eFR Part 39 [Docket No. FAA-200S-lllS; Directorate Identifier 2007-NM-3IS-AD) RlN 2120-AA64 

# I Airworthiness Directives; The Boeing Company Model 737-600. -700, -700C, -800, -900, and -900ER Series Airplanes I AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). ACTION: Supplemental notice ofproposed rulemaking (NPRM); reopening of comment period. SUMMARY: The FAA isrevising an earlier NPRM for an airworthiness directive ( that applies to allBoeing Model 737-600, -700:J700C, -800, and -900 series airplanes. The original NPRM would have superseded an existing AD that currently requires reviewing the airplane maintenance records to de~ermine whether an engine has been removed from the airplane since the airplane was manufactured. For airplanes onwhich •

an engine has been removed, the existing AD also requires aninspection ofthe aft cngi~ O.rE mount to determine ifthe center link assembly is correctly installed, and follow-on actions ifnecessary. The original NPRM proposed torequire the same actions for airplanes onwhich the engine has notbeen previously removed. The original NPRM

. I resulted from reports indicating that operators found thatthe center link assembly for the AOOITIMG'J'''1!I(lI,. aftengine mount was reversed on several airplanes that had nothad anengine removed since delivery. This new action revises the originll NPRM byexpanding the applicabilit
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# .. to include Model 737-900ER airplanes. We areproposing this supplemental NPRM to prevent increased structural loads onthe aft engine mount, which could result infailure ofthe aftengine mount and consequent separation ofthe engine from the airplane
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FAAForm 1360·14.1 (6·89) OFFICIAL FILE

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DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14 CFR Part 39 [Docket No, FAA-200S-lllS; Directorate Identifier 2007-NM-3IS-AD] RIN 2120-AA64 Airworthiness Directivesj The Boeing Company Model 737-600, -700, -70De, -800, -900, and -900ER Series Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). OUTl"G SYM~Ol 

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that applies to all Boeing Model 737-600, -700, -70DC, -800, and -900 series airplanes. comment period. ACTION: Supplemental notice ofproposed rulernaking (NPRM); reopening of 

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# / 5"/~7 ;l.OID SUMMARY: The FAA isrevising an earlier NPRM foran amvorthiness directive (AD OUI"'II Srn>boI 

## ~RE' The original NPRM would have superseded an existing AD that currently requires reviewing the airplane maintenance records to determine whether an engine has been removed from the airplane since the airplane was manufactured. For airplanes onwhich
an engine has been removed, the existing AD allo requires an inspection ofthe aftengin mount to determine ifthe center linkassembly il correctly installed, and follow-on actions ifnecessary. The original NPRM Proposbd torequire the same actions for airplanes on which the engine has notbeen previously removed. The original NPRM resulted from reports indicating that operators found that the center linkassembly forth aftengine mount was reversed on several airplanes that had not had an engine removed 0\ITl GSYM Ol

since delivery. This new action revises theoriginal NPRM by expanding the applicabili .il,dd

## f51-~pR ' to include airplanes flB which theengiR@ !:las 1'-10t beeu previOt:lsl) rCli1ovea. We are II ' proposing this supplemental NPRM toprevent increased structural loads onthe aft engi NG SYMBOl.


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INlTlA<,S,lSlG NlbV -900, and -90GERSeries Airplanes [Docket No. FAA-2008-HI8; Directorate Identifier 2007·NM-318-AD) RlN 2120-AA64 14CFR Part 39

Airworthiness Directives; The Boeing 

### Comparly Model 737-600, -700, -70De, -800, I AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT).

comment period. ACTION: Supplemental notice ofproposed rulemaking (NPRM); reopening of



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# ~~ I -s/~7. :tolD SUMMARY: The FAA isrevising an earlier NPRM foranairworthiness directive (AD s"-: that applies toallBoeing Model 737-600, -700, -70De, -800, and -900 series airplanes. The original NPRM would have superseded anexisting AD that currently requires reviewing the airplane maintenance records todetenrune whether an engine has been removed from the airplane since the airplane was manufactured. For airplanes on which
anengine has been removed, the existing AD also requires an inspection ofthe aftengin AlE: mount to determine ifthe center link assembly iscorrectly installed, and follow-on actions ifnecessary. The original NPRM proposed torequire the same actions for airplanes on which the engine has not been previously removed. The original NPRM resulted from reports indicating that operators found that thecenter link assembly forth aft engine mount was reversed on several airplanes thathad nothad an engine removed since delivery. This new action revises theoriginal NPRM by expanding the applicabili

j'rhJ« 11)·'iO(lt~ .- to inc1ude"airplanes Oft'"which theengine .has-t:tstbeeRpn~ViglJ51yrefflOVB8..We are proposing this supplemental NPRM toprevent increased structural loads on the aft eng·
NmAI.SISIGDEPARTMENT OF TRANSPORTATION Federal Aviation Administration [4910-13-P]
Nee; NeES llTINQ SYMilOL ANI,:'110 PD 14 CFR Part 39 [Docket No. FAA-200S-11IS; Directorate Identifier 2007-NM.3IS-ADJ RlN 2120-AA64 Airworthiness Directives; The Boeing Company Model 737·600, -700, w70De, -800, -900, and -900ER Series Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). ACTION: Supplemental notice ofproposed rulemaking (NPRM); reopening of comment period. SUMMARY: The FAA is revising an earlier NPRM for an airworthiness directive (AD that applies to all Boeing Model 737-600, -700, 

# r700C, -800, and ·900 series airplanes. The original NPRM would have superseded an existing AD that currently requires ounNG SYMl>Ol ANE-141

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OUTING SYMIlOL ANE-I40

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N1TW15lJl\NAME reviewing the airplane maintenance records to determine whether an engine has been 1"~Jv.I 

# I m removed from the airplane since the airplane was manufactured. For airplanes on which I;l.\Lo\ 1D I OUTINGSv"lllOl an engine has been removed, the existing AD also requires an inspection of the aft engin ANE·ltO I WI NI mOlUltto determine ifthe center link assembly 

# ij correctly installed, and follow-on •

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actions ifnecessary. The original NPRM proposed to require the same actions for 

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. 1 RM <.mNG SYMBOL airplanes on which the engine has not been preVIOusly removed. The arigma NP ANE-Ill resulted from reports indicating that operators f+nd that the center link assembly for the ""'~"~~ aft engine mOIDl! was reversed on several airplanes that had not had an engine removed ATE. 

## :1/ since delivery. This new action revises the OrigJal NPRM by expanding the applicabilit I. i":;;.::' to include Model 737~900ER airplanes. We are proposing this supplemental NPRM to prevent increased structural loads on the aft engihe mount, which could result in failure of the aft engine mount and consequent separatidn ofthe engine from the airplane.