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DEPARTMENT OF TRANSPORTA nON NClJRRENCES

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

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Airworthiness Directives; Bombardier, Inc. Model CL¥600·2CIO (Regional Jet Series 0un:"JSYMOOL

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700 & 701) Airplanes, Model CL·600·2DI5 (Regional Jet Series 705) Airplanes, and ,t

RIN 2120-AA64

Model CL·600·2D24 (Regional Jet Series 900) Airplanes

[Docket No. FAA-2009-0995; Directorate Identifier 2009-NM-123-AD; Amcodme

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Federal Aviation Administration

14 CFR Part 39

ACTION: Final rule. C- (0 ('oJOUHN(i SThlBOL

SUMMARY: We are adopting a new ain:vorthiness directive (AD) for the products list IALSI"lG

above. This AD results from mandatory continuing airworthiness information (MeAl) DATE

originated by an aviation authority of another country to identify and correct an unsafe WlITTN(i SYMIlOL

condition on an aviation product. The MeAl describes the unsafe condition as:

INlTlAUilSIG

Investigation into a landing gear retraction problem on a production test

flight revealed that, during aircraft pressurization and depressurization

cycles, the pressure floor in the main landing gear bay deflects to a small

extent. This causes relative misaligmnent between the [alternate-extension

system] AES bypass valve, the dOlNIllockassist valve and the summing

lever which, in turn, can result in damage to and potential failure of the

respective clevis attached to one or both of the valves. Such a clevis

failure could remain dormant and, in the subsequent event that use of the

AES was required, full landing gear extension may not be achievable.

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* * * * * * *
14910-I3-Pj

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0995j Directorate Identifier' 2009-NM·123-AD; Amendment

39-*****; AD ::<-***-**-**]

RIN 2120-AA64

Ainvorthiness Directives; Bombardier, Inc. Model CL-600-2CIO (Regional Jet Series

700 & 701) Airplanes, Model CL-600-2D15 (Regional Jet Series 705) Airplanes, and

Model CL-600-2D24 (Regional Jet Series 900) Airplanes

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

(DOT).

ACTION: Final rule.

SUMMARY: We arc adopting a new airworthiness directive (AD) for the products listed

above. This AD results from mandatory continuing airworthiness information (MeAl)

originated by an aviation authority of another country to identify and Corrcct an unsafe

condition on an aviation product. The MeAl describes the unsafe condition as:

lnvestigation into a landing gear retraction problem on a production test

flight revealed that, during aircraft pressurization and depressurization

cycles, the pressure Ooor in the main landing gear bay deflects to a small

extent. This causes relative misalignment between the [alternate-extension

system] AES bypass valve, the downlock assist valve and the summing

lever which, in turn, can result in damage to and potentia} failure of the

respective clevis attached to one or both of the valves. Such a clevis

failure could remain dormant and, in the subsequent event that use of the

AES was required, full landing gear extension may not be achievable.

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14 CFR Part 39

[Dockct No. FAA-2009w0995j Dil'ectorate Idcntilicr 2009-NM-123-AD; Amendment

39-"'***"'; All  -** -**)

RIN 2120-AA64

Ainvol"thincss nif"(~ctives; Bombardier, Inc. Mode] CL-600-2ClO (Regional Jet Series

700 & 701) Airplanes, Model CL-600-2DI5 (Regional kt Series 70S) Airplntlc~, llJ1d

Model CLw600-2D24 (Regional Jet Series 900) Airplanc:-i

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ACTlON: Final rule.

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originated by an IIvi<ltioll authority of another l,;ountry [0 identify ami COITcct<Illunsarc

AGENCY; Federal Aviation Administration (FAA), Department ofTnmsportuliol1

condition OIlI.IIl aviation product. The MeAl describes rite unsufe c()ndilion us:

Investigation into nlanding gear retraction problem on a production lest

flight revC<"l.ledthat, during aircraft pres!:iurization and dcpn:ssurii'll1ion

cycles, the pressure -floor in the main landing gear bilY deOee!s 111a SIll<lJl

ex[ent.. This cnuses rclalivl:: misalignment between the [alternate-extension

system.l AES bypass valve, the downlock USSlslvalve 1\mlthc slHllmiflg

lever which., in turn, can reSU11in damage to und potential fniltll'c orlhe

respective clevis attachcd to one or both of the vulves, Such II ckvis

lhillln; could remain dormant und, in the subsequcnt t.:vcnt Ibal LIseof the

AES was required, full landing geur extension 1ll,IY 1101 be achicvublc .

above, This AD rc.'>llitsfrom mandatory continuing airwOrlhiness informn[ion (MeAl)

SUMMARY: We arc adopting a new nilworlhiness din:ctiv~ (AD) fhf the products li::;ted