[4910-13-PJ

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 (Docket No. FAA-2010-0643; Directorate Identifier 2010-NM-030-ADj Amendme 

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# 1--1-D2- 39-*****; AD 2010-**- *] RJN 2120-AA64 Airworthiness Directives; Bombardier, Inc. Model DHC~8 Airplanes AGENCY: Federal Aviation Administration (FAA). Department ofTransportation (DOT). ACTION: Final rule. SUMMARY: We are adopting anew airworthiness directive (AD) forthe products list above. This AD results from mandatory continuing airworthiness infomlation (MeAl) originated by an aviation authority ofanother country to identify and correct anunsafe condition on an aviation product. The MeAL describes the unsafe condition as: The landing gear-altemate extension SYStCtl1I11 the cockpit is accessible through an access panel located onthe bockpit floor. There have been reports offailure ofthe access panel latch assembly as aconsequence of repeated closure ofthe access panel involving the use ofexcessive force. Failure ofthe latch assembly can resultlin the access panel beingjammed inthe closed position, andrequire mecHanical prying to open. An undetected or uncorrected latch failure condition inthe access panel can prevent immediate access to the landing gear alternate extension system by the flight crew during an em~rgency. 

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## ** We are issuing this AD to require actions to correct the unsafe condition on these products. DATES: This AD becom" effective [INSERT DATE 35 DAYS AFTER DATE OF OlITl GS\'MIIOI.
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EN'T'Al.&SIG1491O-13-P) CONCURR1,~C", ROUT'NG SYM"OL ANIC-171 DEPARTMENT OF TRANSPORTATION Fedel"alAviation Administration 14eFR Part 39 ROUT' -SVMOOI toug nC~dl AEG (Docket No. FAA-2010-0643j Directorate Tdtmtifier 2010-NM·030-AD; Amendment 

### I 39-*****; AD 2010-**-**1 lNlT''''-'W"Nj'MI' {iWinn(,-.,'

.OUT'N" "M'«". ANI':-171 [UN 2120-AA64 Airworthiness Directives; Bombardier, Inc. Model DHC-8 Airplanes lNn'IAU,,"RNAME 

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'~()o-{",,,Ol> ,\NE:'17Q (DOT). ACTION: Finalrule.

above. This AD results from mandatory continuing airwOlthiness information (MeAl) originated by an aviation authority of another cbuntry to identify and caneel an unsafe AGENCY: Federal Aviation Administration (FAA), Department ofTransportation

I SUMMARY: We areadopting anew airwOlihiness directive (AD) fortheproducts listed

condition onanaviation product. The MeAl describes the unsafe condition as: The landing gear alternate extension system in the cockpit is accessible through an access panel located on the doekpit floor. There have been reports offailure ofthe access panellat~h assembly as a consequence of repeated closure ofthe access panel invplving the use of excessive force. Failure ofthe latch assembly can result in the access panel being jammed in the closed position, and require mechhnical prying to open. RO\JTIN()S~MltOl_

An undetected or uncorrected latch failure condition in the access panel can prevent immediate access to the lan~ing gear alternate extension system by the flight crew during an emdrgency. 

### * * * We are issuing this AD to require actions to eol-eet the unsafe condition on these lNII'IAL'IS'U products.