[4910-13-F

14 CFR Part 39 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration



# 1\(:,\ IDocket No. FAA-2010-*****; Directorate Identifier 201O-NM-152-AD] RIN 212Q-AA64 Ainvorthiness Directives; Ernpresa Brasileira de Aeronautica S.A. (EMBRAER) """"'_ •... - el '.1..Ii - i\[

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Ithas been found occurrence ofscrew units manufactured with metallographic non-conf0nnity that may increase their susceptibiLity to brittle fracture. The screw failure may result in loss ofthe related balance washer causing a possible ram air turbine (RAT) imbalance event, which may result in RAT structural failure, which associated with an electrical emergency situation, could result in loss ofpower to airplane flight 

# liT\ controls hydraulic back-up system. information (MCAI) originated by an aviation authority of another country to ident 

### ~" and correct an unsafe condition on an aviation product. The.MCAT describes the un 

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### ,,""'- listed above. This proposed AD results from mandatory continuing airworthiness

condition as: AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). ERJ 170and ERJ 190Airplanes

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### C·G-<.-- SUMMARY: We propose to adopt anew airworthiness directive (AD) for the pro( "m 

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## * n Loss ofpower to the hydraulic back-up system for airplane flight controls could red the ability of the flightcrew to maintain the safe flight and landing ofthe airplane. 1

'1!I'l5·71;9·211j491D-IJ-PI DEPARTMENT OF TRANSPORTATION Federal Aviation AdmioistTatiOD 14CFR Port 39 (Docket No. FAA-201U-***'**;'Directorate Identifier 201O-NM-I 52-AD) KIN 212D-AA64 _:: .. -,"-.; I::;.

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AirwortbineS5 Directives; Empresa Brasileira de AeronautiC<! S.A. (EMBRAER) Mo ERJ 170and ERJ 190 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed. rulemaking (NPRM). 

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-- SUMMARY: We propose [0 adopt anew aiTWorthiness directive (AD) for the product •.• " lisled above. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority of another couOlry to identify andcorrect an unsafe condition onan aviation product. The MeAl describes the unsa£ condition as: 

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"1T>oOU<OI-''''''' Ithas been found occurrence ofscrew units manufaclUred with metallographic non-.eonfonnilY that may increase their susceptibility to brittle frd.Cture. The screw failure may result in loss ofthe related balance washer causing apossible ram airtwbine (RAT) imbalance event. which may resuh in RAT structural failure, which associated with an electrical emergency situation, could result in loss ofpower to airplane flight controls hydraulic back~up system. 

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# --~ -,- The proposed AD would require actions that are intended to address the unsafe conditi n 

### ••• described inthe MeAl. DATES: We must receivc comments on this proposed AD by [INSERT DATE 45

FAA Form 1360014.1 (6-89) OFFICIAL FILE copy -4u_s. GOIIeFlNo.EmPIllNTI"IG OFfice"t9$· 111I-2"