### Airworthiness Directives; Bombardier, Inc. Model CL-600-2B 19(Regional Jet Series

14 CFR Part 39 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration



# 11I3 IDocket No. FAA-2010-*****; Directorate Identifier 20IO-NM-I2I-ADJ RIN 2120-AA64

100 & 

### 440) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). 14910-13-r

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### SUMMARY: We propose to adopt anew airworthiness directive (AD) for the products ..Dr:JJ,fJI.- -1C6 

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

### originated by

### an aviation authority of another country to identify and COlTeel 

### an unsafe condition on an aviation product. The MeAl describes the unsafe condition as: During flight-testing ofawing anti-ice piccolo tube containing a deliberate small breach, itjwas determined that the wing leading edge thermal switches PartNumber (PIN) 601R59320-1 were not detecting the consequent bleed leak atthe design threshold. As aresult, Airworthiness Limitation (AWL) tasks, ¢onsisting ofafunctional check ofthe wing leading edge thermal swit~hes (PIN 601R59320-1) and an inspection of the wing anti-ice duct piccolo tubes on aeroplanes with these switches installed, have been introduced. These tasks will limit exposure to dormant failure ofthe wing leading edge thermal switches inthe event ofpiccolo tube failure, which could potentially compromise the structural integrity of the wing leading edge and the effectiveness ofthe wing anti-ice system. 00 lNG:;'M~OL

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## * * * * * Theproposed AD would require actions that are intended to address the unsafe conditionL

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### DEPARTMENT OF TRANSPORTATION Federal AviationAdministration 14eFR 

### Part 39 (Docket No. FAA-2010-"""***j Directorate Identifier 2010~NM-12I-AD) RIN 2120-AA64 Ainvorthiness Directives; Bombardier, Inc. Model CL·600·2B 19 (Regional Jet Series 

### 100&

### 440) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. I 

### ACTION: Notice ofproposed rulemaking (NPRM). I SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed ahove. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated byan aviation authority of another country to identify and correct an unsafe condition on an aviation product. The 

### MeAl describes the unsafe condition as: 

### During flighHesling ofawing anti-ice piccolo tube containing a deliberate small breach, it was determined that the wing leading edge thermal switches Part Number 

### (PIN) 601 R59320-1 were not detecting the consequent bleed leak at the design tlweshold. As a result, Airworthiness Limitation (AWL) tasks, consisting ofa functional check of the wing leading edge thermal switches 

### (PrN 601 R59320-1) and an inspection of the wing anti-ice duct piccolo tubes on aeroplanes with these switches installed, have been introduced. These tasks wi1l1imil exposure to donnanl failure ofthe wing leading edge thermal switches in the event of piccolo tube failure, which could potenti£llly compromise the structural integrity of the wing leading edge and the effectiveness ofthe wing anti-ice system. I >I< * *1 * * * >I' NITIALSlSfG C G ez

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The proposed AD would require actions that are intended to address the unsafe condition14IJ /U-IJ·l'j IlEI'i\RTMENT OF TRANSI'OHTATION ! Federal Aviatioll Admillistnltinn ,'J,,""""""U.;:--· 

### ,Wi""'''''''','''' 1\1-;1',1'1'\ ---_ ,,' ..,.., ""-""",'." ,\)1\jIN ,14CFH. Part39 I IDoc!{e1' No. FAA-20III-if""""""; Diredurate Identifier 2010~NI\1.121~AJ)1 I H1N2120-AAC,<.. 

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. . . . . AlI'worthmcss Dln'lCI1VCs; BOIll1JI1l'l!ICt·, Inc. Model C.1.-600~2Bl ()(Rt:gJonul Jcl ~encs 100 & 440) Airpltlll(':c; AGENCY: r:CdCl'lll Aviulioll l\.(liiillisl]"ll[iOn (FAA), DOT. ACTION: Notice ofpmposed l"lllbnaking (NPRtv.l). I SUMMAH.Y; We propose to adopt <1 new llil'wonhiness direclive (.'\OJ 101'thL'pr()c1u<:l" listed above. This propose-cll\D ,'cLulls (i·om 1I1and810l"Y continuing ,ljnv()l'thinc~s ! \llro]"lll<ltioll (MeAl) l1rigimllcd b~all ,lvi;\tion llnLllorily l1fnnoiher calm!!'y to idcniify HndL'OITce[an unsnfc condition or] an tlvialion proc!ut:1. 'The. MC!\l ul.':>erib(~s lIw \lll:';:-lic l:onuj(iOll ,I.';]: DtIl'ing flight-tesLing of n ~·ing <lnll-ice piccolo tLlbccOl1tail1lJ1g n delibcrntu small breach, i[ wns dctormineclthal the wing kiltJill[i 

### tuge thennill switches Pflrt Number (PIN) 601R59J20-1 w~~ren01 d(!lecling lhe l:on:-\~qucl1l bleed ic,l1c al tHe design Lhreshold i\S a result, /\irwonhine.';~: Lilllihltioll (/\ WL) til.sk:;, wn:;isling or a fum: [jolwl cheek ()

## rthe wing lending edge lhcrmal switches (PiN 60 IRS9J20-1) ~mdan in~pec!ioll 01' the wing anti-ice duct piccolo tubes on acrophmc~ wilh \llC's0 .';wj[ch,~~ in<ilUlJcd,have been intrm.luccd. These 'L,)~k::;will limil exposure ltl dormant J11iILll"C oethe wing knding-edge thcrtnal switches inlhc CV(~I1[oi·piecolo lube fllilun:, whio.:h could potentially COmpl"Olll:SC [he siruclurnlllllegri\y ul" Lhewing lending edge <lndIt he ellcc:tivclless of' the wing nnli~icu sy::;lt:fll_ '<iWi';;;C~- ,,\~E"i?1



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The prnpo.'lc(l I\D would require ndions Ihm Hn.~ inlclldcd 10address the lJnsalu Go])dillUrJ