14 CFR Part 39

[4910-I3-Pj

DEPARTMENT OF TRANSPORTA nON

Federal Aviation Administration

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IDocket No. FAA-2010-*****; Directorate Identifier 2010-NM-155-ADJ

RlN 2120-AA64

Airworthiness Directives; Bombardier, Inc. Model CL-600-2ClO (Regional Jet Series

700, 701, & 702) Airplanes, Model CL-600-2D 15 (Regional Jet Series 705) Airplanes,

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

AGENCY: Federal Aviation Adminislration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the product

listed above. This proposed AD results from mandatory continuing airworthiness

information (MeAl) originated by an aviation authority of another country to identi fy INLTI~LSfSIG

and eOlTed an unsafe condition on an aviation product. The MeAl describes the unsafe 'lATE

condjtion as:

Rudder Travel Limiter (RTL) return spring, part number (PIN)

E0650-069-2750S, failed prior to completion of the required endurance

test. Lnaddition, the replacement RTL retum spring, PIN 670-93465-1

* * * was found to be susceptible to chafing on the primary achlator,

which could also result in eventual domlant spring failure. There are two

return springs in the RTL and ifboth springs failed, a subsequent

mechanical disconnect of the RTL components would result in an

unaIUlUllciated failure of the RTL. This, in [urn, would pennjt an increase

of rudder authority beyond nonnal structural limits and, in the event of a

strong rudder input, controllability of the aeroplane could be affected.

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[4910-13-1'1

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR Part 39

(Docket No. FAA-2010-***"'*; Directorate Identifier 2010-NM-155-AD]

RIN 2120-AA64

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

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700,701, & 702) Airplanes, Model CL-600-2DI5 (Regional Jet Series 705) Airplanes,

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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products

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listed above. This proposed AD results from mandatory continuing airworthiness

information (MeAJ) originated by an aviation authority of another country to identify

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and correct un unsafe condition on an aviation product. The MeAl describes the unsafe

condition as:

Rudder Travel Limiter (RTL) return spring, pal1 number (PIN)

E0650-069-2750S, failed prior to completion of the required endurance

test. In addition, the replacement RTL return spring, PIN 670-93465-1

.•.•.• was found to bc susceptible 10 chafing on the primary actuator,

which could also result in eventual dormant spring failure. There arc two

return springs in the RTL and if both springs failed, a subsequent

mechanical disconnect of the RTL componelits would result in an

unannunciated failure of the RTL. This, in turn, would permit an increase

of rudder authority beyond normal structural limits and, in the event of a

strong rudder input, controllability of the aeroplane could be affected .

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ANl:·170

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• • • • • • •
14910-13-1'1

DR]' ARTMENT OF TRANSPORTATION

J"cdcl"al Aviation Adminisfl-atioll

IDocl(C( No. FAA.2010-*****; Dircrturalc ltlcntificl' 2010.NM-15S-AOI

RIN 2120-AA64

Airworthincs.'1 Directives; Bombardier, Inc. Model CL-oOO-2Cl 0 (Regional .leI Serie"

700. 701, & 702) Airplanes, Model CL-600-2D! 5 (Regional Jet Scric:; 705) l\irplltllCS,

find Model CL-600-2D24 (Rcgionnl Jel Series (00) Airplnl1cs

AGgNCY; T,'txlcml Aviulion Aurninisln'lliorl (f-'At\), DOT.

ACTION: Nolie!.:of proposed nliemu!,ing (NPRM).

SUMMAH.V: We proJlose to udopl a new airwonhiness directive (AD) fl.)f the prodllcls

liswd above. This proposed AD results Ii'om mandatory continuing ain,\'orlhincss

inf'orrnalion (MeAl) original cd by an :lVifition authorit)' of another coLIntry to identify

and correct un unsafe condition un un uvintion pruduct. The MeAl describes lhe ullsafe

condition as:

Rudder Travel Limiter (RTf,) I'ClUm spring, part number (PIN)

E0650·069-2750S. failed priOJ' IQcompletion orlhe required endurance

test. In addition, lhe replacement RTL rc1um spring, PIN 670-934(i5~ I

.• '" ""was lbund to be suscq)[iblc (() elulling Oil the primary ,Iduutnr,

which CQuld also result in eventual dormant spring failure. There ar~ twn

rdurll springs in lhe RTL and irboth springs fililcd.l1 subsequent

l1lt.::cl1anic(l1<!i:sconnl:ct or the RTL components would result in all

unannllllcialcd failure of the RTL. This, in turn. would permit un increase

of rudder iIll1hority beyond nOrJlml slmelural1imits and. in the evenl or a

strong rudder inpl,t, controllability of the neropl"ne could be "ffeeled.

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