14910-13-PI

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

(DOT).

Airplanes

RlN 2120-AA64

ACTION: Notice of proposed ruJemaking (NPRM).

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. //4 ""1·'l Airworthiness Directives; The Boeing Company Model 737-300, -400, and -500 Series tj'l&vJt."----

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3/25/10

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

14 CFR Part 39 J-orc-0370

IDocket No. FAA-~-I t 1I Ij Directorate Identifier 2009-NM-210-AD)

SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD) - I C'-c

that applies to all Model 737-300, -400, and -500 series airplanes. The existing AD :>If$;hnt~

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currently requires inspecting to determine if certain carriage spindles are installed, Lf It lO

repetitive inspections for corrosion and indications of corrosion on affected carnage

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spindles, and if necessary, related investigative and corrective actions. The existing AD

also provides optional terminating action. This proposed AD would mandate the optiona I>AH

terminating action, which would eliminate the need for the repetitive inspections. The

existing AD results from reports of corrosion found on carriage spindles that are located

on the outboard trailing edge flaps. We are proposing this AD to detect and correct

corrosion of the carriage spindle, which could result in fracture. Fracture of both the

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inboard and outboard carriage spindles, in the forward ends through the large diameters,

on a flap, could adversely affect the airplane's continued safe flight and landing.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

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date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

• Federal eRulemaking Portal: Go to http://wwvv.regulations.gov. Follow the
14910-13-P)

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR Part 39

IDocket No. FAA-2009-1 I I I I; Directorate Identifier 2009-NM-210-AD)

RlN 2120-AA64

ROUnNG SYMBOL

Airworthiness Directives; The Boeing Company Model 737-300, -400, and -500 Series AtXfH2'.t6/t\iH

INITIALS/SIG

Airplanes

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

(DOT).

ACTION: Notice ofpropo~ed rulemaking (NPRM).

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

that applies to all Model 737-300, -400, and -500 series airplanes. The existing AD

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currently requires inspecting to determine if certain camage spindles are installed,

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spindles, and if necessary, related investigative and corrective actions. The existing AD 0 HGSYMIlOL

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also provides optional terminating action. This proposed AD would mandate the optiona zP'.)iL,.\1 eo

terminating action, which would eliminate the need for the repetitive inspections. The ATE'

repetitive inspections for corrosion and indications of corrosion on affected carriage

existing AD results from reports of corrosion found on carriage spindles that are located

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on the outboard trailing edge flaps. We are proposing this AD to detect and correct

corrosion of the carriage spindle, which could result in fracture. Fracture of both the

inboard and outboard carriage spindles, in the forward ends through the large diameters,

on a flap, could adversely affect the airplane's continued safe flight and landing.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the

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[4910-13-PJ

DEPARTMENT OF TRANSPORTA nON

Federal Aviation Administration -O'>(VRRENCES

OI)T!NG SYMBOL

14 CFR Part 39 1\1-0'- it)

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[Docket No. FAA-2009-+++++; Directorate Identifier 2009-NM-210-AD)

.RIN 2120-AA64

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

ROUTI'IG SYMBOl

Ainvorthiness Directivesj The Boeing Company Model 737-300, -400, and -500 Series Aum-Il.t,-sltJM

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Airplanes

(DOT).

ACTION: Notice of proposed rulemaking (NPRM).

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

that applies to all Model 737·300, -400, and ~500 series airplanes. The existing AD

OUTING sy OL

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currently requires inspecting to detennine if certain carriage spindles are installed,

repetitive inspections for corrosion and indications of corrosion on affected carriage

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spindles, and if necessary, related investigative and corrective actions. The existing AD 0 NGSYMBOL

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also provides optional terminating action. Ibis proposed AD would mandate the optiona z;lf)-zGVL.{) e

terminating action, which would eliminate the need for the repetitive inspections. The ATE

existing AD results from reports of corrosion found on carriage spindles that are located

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on the outboard trailing edge flaps. We are proposing this AD to detect and correct :')t"A --1'tEq

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corrosion of the carriage spindle, which could result in fracture. Fracture of both the

inboard and outboard carriage spindles, in the forward ends through the large diameters, :'J..lr//d

OUTING sYMBOL

on a flap, could adversely affect the airplane's continued safe flight and landing.

DATES: We must receive comments on this proposed AD by {insert date 45 days after

date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

I'tWrn 1 tv ';:>

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• Federal eRulemaking Portal: Go to http://www.regulations.gov.Followthe

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