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DEPARTMENT OF TRANSPORTATION

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Federal Aviation Administration

D703

[Docket No. FAA-2010-*****; Directorate I eotifier 2010-NM-040-AD}

RIN 2120-AA64 J

Airworthiness Directives; Bombardier, Inc. odel CL-600-2B19 (RegIOnal Jet Sene :F'<><IT'''G •

I

100 & 440) Airplanes, CL-600-2ClO (Regional Jet Series 700, 701, & 702) Airplanes

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

Series 900) Airplanes

14 CFR Part 39

AGENCY: Federal Aviation Administration (lAA), DOT

ACTION: Notice of proposed rulemaking (NPr). _

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the product

listed above. This proposed AD results from mLdatory continuing airw011hmess

infonnation (MeAl) originated by an 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, in the area close to the ADO catmon plug. Several electrical wires

were fmUld cut as a combined result oftolTosion and bending stress from

the bamess mounting to the ADG. l

The ADO electrical wires are insulated I ith a silver-plating for corrosion

protection. It has been detennined that re silver-plating of wire strands in

the area of tight bend is highly susceptifule to breakdown. The plating layer

may crack as a result of mechanical str~ss, and consequently lead to the

onset of corrosion on all, or a majority, bfthe wire strands.

FAA Form 1360-14.1 (6-89) OFFICIAL j::ILE COpy

* U.S,GPO:l BIl().{)-766-012/20101
DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14910-13-1' J ¢(JNW""""C"

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14 CFR 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, 70 I, & 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 of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airw+hiness directive (AD) for the products

listed above, This proposed AD results from mandatory continuing airworthiness

information (MeAl) originated by an aviation authority of another country 10 identify

and correct an unsafe condition on an aviation pFOduct. The MeAl describes the unsafe

condition as:

There have been failures of the harness assembly (power reeder wires)

connecting the Air-Driven Generator (ADG) to the aeroplane electrical

system, in the area close to the ADG cannon plug. Several electrical wires

were found cut as a combined result of corrosion and bending stress from

the harness mounting to the ADG. J

The ADG electrical wires are insulated \ <itha silver-plating for corrosion

protection. It has been detemlined that thb silver-plating of wire strands in

the area of tight bcnd is highly susceptible to breakdown. The plating layer

may Cnl.ckas a result of mechanical stress. and consequently lead to the

onset of cOlTosion on all, or a majority. 0 the wire strands.

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