[4910-1 DEPARTMENT OF TRANSPORTATION

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# D703 [Docket No. FAA-2010-*****; Directorate I eotifier 2010-NM-040-AD} RIN 2120-AA64 

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Airworthiness Directives; Bombardier, 

### Inc. odel CL-600-2B19 (RegIOnal 

### JetSene :F'<><IT'''G • I 100 

### &440) Airplanes, CL-600-2ClO (Regional Jet Series 700, 701, 

### & 702) Airplanes I 

# 1~7'l7-/O CL-600-2D15 (Regional Jet Series 705) Airplanes, and CL-600-2D24 (Regional Jet

_ Series 900) Airplanes 14 CFR Part 39

AGENCY: Federal Aviation Administration (lAA), DOT ACTION: Notice of proposed rulemaking (NPr).

_ SUMMARY: We propose to adopt anew airworthiness directive (AD) for the product listed above. This proposed AD results from 

### mLdatory continuing 

### airw011hmess infonnation (MeAl) originated byan aviation 

### LthoritY of another country to identi fy

condltlon as. There have been fmlures of the hamess assembly (power feeder wires) connecting the Air-Driven Generator 

### (AnO) to the aeroplane electrical system, inthe area close to the ADO catmon plug. Several electrical wires were fmUld cut as acombined result oftolTosion and bending stress from the bamess mounting to the ADG. 

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The ADO electrical wires are insulated I ith a silver-plating for corrosion protection. It has been detennined that re silver-plating ofwire strands in the area of tight bend is highly susceptifule to breakdown. The plating layer may crack as aresult of mechanical str~ss, and consequently lead to the onset of corrosion on all, or amajority, bfthe wire strands.

FAA Form 1360-14.1 (6-89) OFFICIAL j::ILE COpy *U.S,GPO:l BIl().{)-766-012/20101DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 

### 14910-13-1' J ¢(JNW""""C" KOlfflNG5'",'10" IANE-l72

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### " 14CFR Part 39 

# I IDocket No. }'AA-2010-*****; Directorate ldf"tifier 2010-NM-040-AD] RJN 2120-AA64 Ain,"'orthiness Directives; Bombardier, Inc. Model CL-60Q-2B19 (Regional Jet Series 100&440) Airplanes, CL-600-2Cl Q(Regional Jet Series 700, 70I, & 702) Airplanes, CL-600-1D 15(Regional Jet Series 705) AirplanL. and CL-600-2D24 (Regional Jet 

# I Series 900) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTfON: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airw+hiness directive (AD) for the products listed above, This proposed AD results from mandatory continuing airworthiness information (MeAl) originated by anaviation authority of another country 10identify and correct an unsafe condition on anaviation pFOduct.The MeAl describes the unsafe condition as: There have been failures ofthe harness assembly (power reeder wires) connecting the Air-Driven Generator (ADG) to the aeroplane electrical system, inthe area close to the ADG cannon plug. Several electrical wires were found cut as acombined result ofcorrosion and bending stress from the harness mounting to the ADG. 

# J The ADG electrical wires are insulated \ <ith asilver-plating for corrosion protection. Ithas been detemlined that thb silver-plating ofwire strands in the area oftight bcnd ishighly susceptible tobreakdown. The plating layer may Cnl.ckas aresult of mechanical stress. and consequently lead to the onset ofcOlTosionon all, oramajority. 0 the wire strands. 

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