[4910-13-P)

DEPARTMENT OF TRANSPORT AnON 

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above. This ADresults from mandatory continuing airworthiness information (MeAl) SUMMARY: We are adopting anew airworthiness directive (AD) forthe products lisle ACTION: Final rule; requestror comments. (DOT). AGENCY: Federal Aviation Administration (FAA), Department ofTransportation Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes



# ot.f~6- [Docket No. FAA-2010-****r; Directorate Identifier 2010-NM"-084-AD;



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# -0'1 Amendment 39-*****; AD 2010-**-**] R1N 2120-AA64 Federal Aviation Administration 14 CFR Part 39

originated byan aviation authority ofanother country to identify and correct an unsafe condition on an aviation product. The MeAl describes the unsafe condition as: Operators ofDHC-8 4iOO Series aeroplanes have been reporting chafing ofwires inthe AC wire harnesses locatedlalong the lower wing shroud on eitherring resulting in a loss of"arious system services. Chafed wire~may lead to arcing, local overheating and AC generator failure. The iAC generators provide power to the anti-icing beaters, including pitot Istatic heater, engine adapter heater, and propeller heater. Failure ofboth AC generators would result inthe loss ofthese systems and poses asafety concern. 'lOUTING SYM!lOl

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OCrm:C SY1IIIIOl Loss ofboth AC generators CfUldlead to unaonunclated loss ofheatto both engine inlet, m=,<o which could lead to loss ofpower inboth engines during icing conditions. This AD 'AT~[4910-13- "CUR"""CES ROUnNG SYMBOl. DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 

### 14CFR Part 39 ANE-171



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'N'l'~LSIS, ROU1'''''' SYMUOl. RIN 2120-AA64

ACTION: Final rule; request for comments. {e SUMMARY: We are adopting anew airworthiness directive (AD) for the products listet;;;7o above. This AD results from mandatory continuing airworthiness information (MeAl) jA~ originated by an aviation authority of another country to 

### ldentifY and correct anunsafe , I condition on an aviation product. The MeAl 

### describes the unsafe condition as: Operators ofDHC-8 

# 4bo Series aeroplanes have Jeen reporting chafing ofwires in

### thelAC wire harnesses 

### locatedl along the lower wing shroud on either ;wingresulting in a loss ofiarious system services. Chafed wires may lead to arcing, local 0rerheating and AC generator failure. The

## f'.C generators provide po"'[er to the anti-icing heaters, including pitot 

### Istatic heater, engine adanter heater, and propeller heater. Failure ofboth AC generators wbuld result inthe loss ofthese systems and poses a safety concern. Airworthiness Directivesj Bombardier, Inc. Model DHC-8-400 Series Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). Amendment 39-*"'***; AD 2010-**-**) [Docket No. FAA-2010-****"'; Diredorate Identifier 201O-NM-084-AD;



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Loss ofbotb AC generators could lead to unannunciated loss ofheat to both engine inlets • 

## , which could lead to loss ofpower inboth engines during icing conditions. This AD 

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