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DEPARTMENT OF TRANSPORTATION Nl"\JIlJl.E.~CE5 UT1!<GS'"MllOl • 14CFR ParI 39 Federal Aviation Administration



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# lOCO IDocket No. FAA-2010-*****j Directorate Identifier 2010-NM-151-ADj R1N 2120-AA64 Airworthiness Directivesj Bombardier, Inc. Model CL-215-1 A10 (eL-2IS), CL-2IS-6B II (CL-2IST Van ant), and CL-2IS1-6BII (CL-4IS Variant) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed mlemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) forthe product listed above. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated byan aviation authority of another country to identify .lfU.I-7 ",n"l..'<ISlG 

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* * A detailed analysis ofthe systems and stmcture in the potential line of trajectory of a failed screw cap/end cap for each accumulator has been conducted. Ithas identified that the worst-case scenarios would be impact damage to various components, potentially resulting in fuel spillage, unconunanded flap movement, or loss of aileron control [and consequent reduced controllability ofthe airplane]. Seven cases of on-ground hydraulic accumulator screw C<:lP or cod cap failure have been experienced 

### * * *, rdulting in loss ofthe associated hydraulic system and high-energy impJct damage to adjacent systems and structure. 

## * * * and con-eet an unsare condition on an aviation product. The MeAl describes the unsafe 'NI11~'..s,SH.i condition as:DEPARTM E.NTOF TRANSPORTATION Federal A\'iation Administration 14CFR Part 39 >.aU""'" '.,oa. ANt-17l (Docket No. FAA-2010~1c***",; Dircctoratc Idcntifier 2010-NM-1S1-AD) RIN 2120·AA64 'Nl'J,u., .• ,,," SAI(iu:.og c .f1J2.I'~ 

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condition as: listed above. 111isproposed AD results from mandatory continuing airv.·orthiness Airworthincss Directives; Bombardier, Inc. Model CL-215-1A10 (eL-2IS),

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## • • • • information (MeAl) originated by an aviation authority ofanother country to identify

A detailed analysis of the systems and structure in the potential line of trajectory of a failed screw cap/end cap foreach accumulator has been conducted. Ithas identilicd that theworst~¢ase scenarios would be impact damage to various components, potentiallYlresulting infuelspillagc, uncommanded Dapmovement, or loss ofaileron control [and consequent reduced controllability ofthc airplane] . Seven cases of on-ground hydraulic accun~ulatorscrew cap or end cap failure have been experienced >l< >jO >10, resultlng illJoss ofthe associated hydraulic system and high-energy impact damage to adjacent systems and structure. '"'" of< ACTION: Notice ofproposed rulemaking (NPRM).

and correct an unsafe condition on an aviation product. The MeAl describes the unsafe SUMMARY: We propose to adopt anew airworthiness directive (AD) for the products CL-215-6B 11 (CL-21ST Valiant), and CL·215-6B II (CL~415 Variant) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT.



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