14CFR Part 39 [4910-I3-Pj DEPARTMENT OF TRANSPORTA nON Federal Aviation Administration



# /lOq 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 ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) for the product listed above. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority ofanother country to identi fy INLTI~LSfSIG and eOlTedan 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 ofthe 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 ofthe RTL components would result in an unaIUlUllciatedfailure of the RTL. This, in [urn, would pennjt an increase ofrudder authority beyond nonnal structural limits and, in the event ofa strong rudder input, controllability of the aeroplane could be affected. ROUTI~G '''"M''QI"
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### * '"[4910-13-1'1 DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14CFR 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 ONCU~~"Nn~ OUTINGsY""Ol. ANE-I73



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. €2- .rr If/Z"611O QVf\....:;sY •••••••. LGB/AEG 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 ofproposed rulemaking (NPRM). SUMMARY: Wepropose to adopt anew airworthiness directive (AD) forthe products ""TIlALSlSlG Co.. 

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# :",.fJ.4fo listed above. This proposed AD results from mandatory continuing airworthiness information (MeAJ) originated by an aviation authority of another country to identify JUllNGSyMl10l ANE- 171

and correct ununsafe condition on anaviation product. The MeAl describes theunsafe condition as: Rudder Travel Limiter (RTL) return spring, pal1number (PIN) E0650-069-2750S, failed prior tocompletion oftherequired endurance test. In addition, the replacement RTL return spring, PIN 670-93465-1 .•.•.• was found to bc susceptible 10chafing on the primary actuator, which could also result ineventual dormant spring failure. There arc two return springs inthe RTL and ifboth springs failed, a subsequent mechanical disconnect ofthe RTLcomponelits would result inan unannunciated failure ofthe RTL. This, inturn, would permit an increase ofrudder authority beyond normal structural limits and, inthe event ofa strong rudder input, controllability oftheaeroplane could be affected. .:::.&.2- . i) OU IlN~"·""U,. 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!.:ofproposed 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'ommandatory continuing ain,\'orlhincss inf'orrnalion (MeAl) original cd byan :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 

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