# .+. Transport Canada Transports

Canada CF·2009-46 TP 7245E 1/2 

# AIRWORTHINESS DIR Issue Date 14 December 2009

The following airworthiness di'''''li"" lAD) may be aprlicabl~la an ai"""n whicl1 our records indicate i. registered in YOUfname. AD. are i.sued pursuant to ca"ad:an Avi."ti""R~g~lalio" (CAR)521 Djyision X. Purs,uan 10Cil.1l605.84 ""d lhe f"rther details ofCARSt;>nd.rd 625, "'pp~nd; •.H, lhe C<l~tinuing

a;rworthioe.ss ofa Ca~adian '"illS"''''" alfcraft ISoont,ngent upon compl,ance wLlh allaPl'llcable AOs, FOllur. 10oomplyWith the reqUirements Df an AI;)ma1 ,"valldal~ 'ne ft;ghtaUlho".allon ofthe aIrcraft Altema,"e means of compliance shall be applied for in accordance wllh CAR 605,84and lhe aiO<lYl'-retereneed S",nd.rd, This AD nas bo@nissued by the ContiMlng AirMJrthiness D1"i;.;on (AARDG), National Aircraft Certification Branch, Transport Can.Oa. Ottawa. telephone 613 S52..•• 357. Number: CF- 2009-46 Subject: Landing Gear Alternate Extensior:'lAccess Panel - Potential Failure to

Open Effective: 7January 2010 Applicability: Bombardier Inc. Model DHC-8 Aeroplanes, asfollows:

DHC-8 Series 100, 200, and 300, wit~ serial numbers 003through 658 DHC-8 Series 400, with serial numbers 4001, 4003, 4004, 4006, 4008 through 4187 Compliance: Within 6 000 hours airtime or three years, whichever comes first, from the

effective date ofthis Directive, unless'already accomplished. Note: The compliance times in this Directive differ from the recommended compliance times mentioned in the Bombardier Service Bulletins (S8) Background: The landing gear alternate extension system in the cockpit isaccessible through

an access panel located on the cockpit floor. There have been reports offailure ofthe access panel latch assembly as a consequence of repeated closure ofthe access panel involving the use of excessive force. Failure ofthe latch assembly can result in the access panel being iammed in the closed position, and require mechanical prying to open 

# I
An undetected or uncorrected latch ~ailure condition in the access panel can prevent immediate access to the landing gear alternate extension system bythe flight crew during an emergency_ This Directive requires the replacement ofthe existing latch assembly with astronger modified latch assembly. Corrective Actions: Within the compliance times specified in this Directive, replace the latch

assembly ofthe access panel forthe landing gear alternate extension system as follows:



# Canada

I 

## J~ ~f."cw:~~av~n~~~~~a:'dQ';,r;~:ri",,"'It;'~' ~~e8C~~i\~~~~~sS~s~wnicationS Cont", jAARC) or WW'W,lC.go.oolci"; I,v"'tion/c<>mmunicaijans!contnli adcltl'SS.asp

1. For Model DHC-8 Series 100, 200, and 300 aeroplanes, in accordance with Bombardier Service Bulletin 8-32(166 Revision A, dated January 29, 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada Civil Aviation.

# I Compliance with the Initial Issue of this Service Bulletin dated April 14, 2008 fulfills the requirement ofthis Directive and no add,t,onal action is reqUi"r

Po","a"t toCAR 202.51 the registe",c owne, ofaC~n.di." ~irc",ft ,hall. withins""en "ay., noti~ tileMinister inwritingofany chanse ofni. Orhe' name ora""reSS_ '

2"-00:<2 (01-2005)I No, CF~2009-46 w 2. For Model DHC-8 Series 400 ae~oplanes, in accordance with Bombardier Service Bulletin 84-32-57 Revision A, dated June 15, 2009, or later revisions approved by the ehler, Continuing Airworthiness, Transport CanadaCivil Aviation. complia~ce with the Initial Issue of this Service Bulletin dated April 30, 2008 fulfills the requirement ofthis Directive and no additional action is required. Authorization: For Minister ofTransport, Infrastructure and Communities

ORIGINAL SIGNED BY



### Contact: Derek Ferguson

Chief, Continuing Airworthiness Mr. Eric S. Lucas, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 613-996-9178 or e-mail 

### fJ:,AW WEB Feedback@tc.Qc.ca or any Transport Canada Centre.