.-

DEP ARTMEI''o'T OF TRANSPORTA nON

Federal Aviation Administration

14 eFR 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 of Transportation

(DOT).

ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of

comment period.

SUMMARY: The FAA is revising an earlier NPRM for an airworthiness directive (

that applies to all Boeing 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The original NPRM would have superseded an existing AD that currently requires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 on which

•

an engine has been removed, the existing AD also requires an inspection of the aft cngi~ O.rE

mount to determine if the center link assembly is correctly installed, and follow-on

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

airplanes on which the engine has not been previously removed. The original NPRM

. I

resulted from reports indicating that operators found that the center link assembly for the AOOITIMG'J'''1!I(lI,.

aft engine mount was reversed on several airplanes that had not had an engine removed

since delivery. This new action revises the originll NPRM by expanding the applicabilit ~..

to include Model 737-900ER airplanes. We are proposing this supplemental NPRM to

prevent increased structural loads on the aft engine mount, which could result in failure

of the aft engine mount and consequent separation of the engine from the airplane .

FAA Form 1360·14.1 (6·89) OFFICIAL FILE COT .

• U.S.GPO: 11190-O-181-0121201 0 1
[4910-13-PJ

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 of Transportation

(DOT).

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that applies to all Boeing Model 737-600, -700, -70DC, -800, and -900 series airplanes.

comment period.

ACTION: Supplemental notice of proposed rulernaking (NPRM); reopening of

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SUMMARY: The FAA is revising an earlier NPRM for an amvorthiness directive (AD OUI"'II Srn>boI

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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 on which

an engine has been removed, the existing AD allo requires an inspection of the aft engin

mount to determine if the center link assembly il correctly installed, and follow-on

actions if necessary. The original NPRM Proposbd to require 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 the center link assembly for th

aft engine mount was reversed on several airplanes that had not had an engine removed

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since delivery. This new action revises the original NPRM by expanding the applicabili

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to include airplanes flB which the engiR@ !:las 1'-10tbeeu previOt:lsl) rCli1ovea. We are

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proposing this supplemental NPRM to prevent increased structural loads on the aft engi NG SYMBOl.

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14910-13-P)

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

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-900, and -90GER Series Airplanes

[Docket No. FAA-2008-HI8; Directorate Identifier 2007·NM-318-AD)

RlN 2120-AA64

14 CFR Part 39

Airworthiness Directives; The Boeing Comparly Model 737-600, -700, -70De, -800,

I

AGENCY: Federal Aviation Administration (FAA), Department of Transportation

(DOT).

comment period.

ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of

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-s/ ~7. :tolD

SUMMARY: The FAA is revising an earlier NPRM for an airworthiness directive (AD s"-:

that applies to all Boeing Model 737-600, -700, -70De, -800, and -900 series airplanes.

The original NPRM would have superseded an existing AD that currently requires

reviewing the airplane maintenance records to detenrune whether an engine has been

removed from the airplane since the airplane was manufactured. For airplanes on which

an engine has been removed, the existing AD also requires an inspection of the aft engin

AlE:

mount to determine if the center link assembly is correctly installed, and follow-on

actions if necessary. The original NPRM proposed to require 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 the center link assembly for th

aft engine mount was reversed on several airplanes that had not had an engine removed

since delivery. This new action revises the original NPRM by expanding the applicabili

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to inc1ude"airplanes Oft'"which the engine .has-t:tstbeeR pn~ViglJ51y refflOVB8..We are

proposing this supplemental NPRM to prevent increased structural loads on the aft eng·

NmAI.SISIG
DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

[4910-13-P]

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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, w 70De, -800,

-900, and -900ER Series Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of Transportation

(DOT).

ACTION: Supplemental notice of proposed 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

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

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removed from the airplane since the airplane was manufactured. For airplanes on which I;l.\Lo\ 1D

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an engine has been removed, the existing AD also requires an inspection of the aft engin ANE·ltO

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mOlUltto determine if the center link assembly ij correctly installed, and follow-on • ;L

actions if necessary. The original NPRM proposed to require the same actions for A~1,...ll,.l\0

J . 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 of the engine from the airplane.