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14 CFR Part 39

FAA Form 1360·14.1 (6-89)

DEPARTMENT OF TRANSPORT ATION

Federal Aviation Administration

OfbS5

(Docket No. FAA-2010-++++j Directorate Identifier 201O-NM-066-AD]

RlN 2120-AA64

Airworthiness Directives; The Boeing Company Model 737-300, -400, and -500 Serie

Airplanes

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

(DOT).

ACTION: NotIce of proposed rulemakllig (NPr)

SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD) OATE~

that applies to all Model 737-300, -400, and -501 series airplanes. The existing AD !.~:'"~

currently requires repetitive inspections for discrepancies of the fuse pins of the inboard 1~rw.t=IC~ATURE

and outboard midspar fittings of the nacelle stTUtl and corrective actions if necessary. 'J.'TE

This proposed AD would continue to require the[repetitive inspections required by the ~m.~""~.

existing AD and add replacing the midspar fuse pins with new, improved fuse pins, 'NfTl.£l-StS'GM'W~E

I

which would terminate the repetitive inspections!. This proposed AD results from a repo T"

of corrosion damage of the chrome runout on thJ head side found on all four midspar fus ~~,,,,,".ruM

pins of the nacelle strut. Additionally, a large p+ion of the chrome plate was missing ,"m,~,"""'"

from the corroded area of the shank. We are proposing this AD to prevent damage ofth DAle

fuse pins of the inboard and outboard midspar fi~ings of the nacelle strut, which could I roUTING sruBOC

result in reduced structural integrity of the fuse pins and consequent loss of the strut and

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separation of the engine from the airplane. DArt

DATES: We must receIVe comments on this pr posed AD by [INSERT DATE 45

I

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

ADDRESSES: You may send comments by an)]]I, of the following methods:

• U.S.GPO: 19\1O-O-lll8·0 1 2120 101

OFFIClAL FILE COpy
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DEPARTMENT OF TRANSPORTATION

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Airworthiness Directives; The Boeing Company Model 737-300, -400, and -500 Series ROUTINGSY"BOL

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RlN 2120-AA64

(Docket No. FAA-2010-++++j Directorate Identifier 201O-NM-066-AD]

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

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ACTION: NotIce of proposed rulemakmg (NPRM). [N~}mSISIC

SUMMARY Th FAA

: d I .. . rth· d· . (AD) t;; (l1-.M'~ . : e' proposes to superse e an eXlshng aIrwo mess lrectlve DA~E

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that applies to all Model 737·300, ADO, and -500 series airplanes. The existing AD G:2 '-I Ie- ·0" "'l $yo'llo)

currently requires repetitive inspections for discrbpancies of the fuse pins of the inboard I !. AI, iSIG

and outboard midspar fittings of the nacelle stru-d,and corrective actions if necessary. '

DAT~

10 n,is proposed AD would continue to require tbe repetitive inspections required by the .7

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existing AD and add replacing the midspar fuse pins with new, improved fuse pins, '5Er-t

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which would telminate the repetitive inspections'. This proposed AD results from a repo t i<:{)

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of corrosion damage of the chrome runout on the head side found on all four midspar fu ~

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pins of the nacelle strut" Additionally, a large portion of the chrome plate was missing Ht-..Jfh-"\OO:J

from the corroded area of the shank. We are pr+oSing this AD to prevent damage ofth

fuse pins oftbe inboard and outboard midspar fittings of the nacelle strut, which could °7/7)/'0

I aUnNG S~MOOL

result in reduced structural integrity of the fuse pins and consequent loss of the strut and

separation of the engine hom the airplane.

DATES: We must receive comments on this prrposed AD by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION IN ,HE FEDERAL REGISTER].

ADDRESSES: You may send comments by an); of the following methods:

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[4910-13-P]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration ~ONCLJ"'R£"CE$

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14 CFR Part 39

[Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-066-AD)

. RIN 2120-AA64 I

6>9.'310

Ainvorthincss Directives; The Boeing Company Model 737~300, -400, and -500 Series ROLJW<GS<MBOL

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Airplanes

AGENCY: Federal Aviation Administration (F!A.A), Department of Transportation

(DOT).

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ACTION: Notice of proposed rulemaking (NPj)' '?cl:L t.c" ..

SUMl\1ARY: The FAA proposes to supersede an existing airworthiness directive (AD) DATE

that applies to all Model 737-300, -400, and -506 series airplanes. The existing AD (,;:2 '/ j lecurrently requires repetitive inspections for disc)epancies of the fuse pins of the inboard

and outboard midspar fittings of the nacelle 5tmJ and corrective actions if necessary.

This proposed AD would continue to require the repetitive inspections required by the 7 1 10

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OUTING SYMBOL

existing AD and add replacing the midspar fuse pins with new, improved fuse pins,

which would terminate the repetitive inspectionSI This proposed AD results from a repo ,

of corrosion damage of the chrome runout on the head side found on all four midspar fu

I . OVTl~G SYM60~

pins of the nacelle strut. Additionally, a large portion of the chrome plate was missing f1t'JrY\--iOO~

I j~IllAI.s/SIG

from the corroded area of the shank. We are proposing this AD to prevent damage ofth

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fuse Pi.nsof the inboard and.outbO.ard midspar fitf.ings of the nacelle strut, which could

I. QJJTING SYMBO~

result III reduced structural mtegnty of the fuse pr'ns and consequent loss of the strut and NmJllSiS1G

separation of the engine from the airplane.

,

"~ DATES: We must receive comments of!-this prlposed AD by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION rN HE FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods: NmAl.5/S1G

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