Transport Transports Canada Canada TP 7245E



# AIRWORTHINESS DIRECTIVE

The follow i ng air w orthiness dir e ctive ( A D ) m a y be applicable to an air c r a ft w h ich our r e cor d s indicate is r egister ed in your na m e . AD s ar e issued pur suant to C a nadian Aviation R egulation (CA R ) 5 9 3 . Pur s uant to C A R 605.84 and the furt her details of C A R Standar d 625, Appendix H

, the continuing air w orthiness of a C anadian r egister ed air c r a ft is contingent upon com p liance w i th all applicable AD s. Failur e to com p ly w i th the r equir e m e nts of an AD m a y invalidate the flight author ization of the air c r a ft. Alter n ative m eans of
com p liance shall be applied for in accor dance w i th CA R 6 0 5

. 8 4 and the above- r e fer enced Standar d

. This AD has been issued by the C ontinuing Air w orthiness D i vision ( AAR D G )

, Air c r a ft C e r t ification Br anch, Tr ansport C a nada, Otta w a , telephone 613 952- 4 357.

Pur s uant to C A R 202.51 the r egister ed ow ner of a C a nadian air c r a ft shall, w i thin seven days, notify the M i nister in w r iting of any change of his or her nam e or addr e ss.

To r equest a change of addr ess, contact the C i vil Aviation C o m m unications C e ntr e ( AAR C ) at Place de Ville, Ottawa, Ontar i o K1A 0N8 , or 1- 800- 305- 2059

, or w w

w .tc.gc.ca/civilaviation/com m unications/centr e/ addr e ss.asp

24- 0022 ( 01- 2005) 1/2 No

. CF-2005-34R1

Issue Date 15 August 2007

Number: CF-2005-34R1

Subj ect: Cockpi tDoor Hi nge Attachment Modi fi cati on

Effec t iv e:

Revi si on: 7 September 2007

Supersedes Ai rworthi ness Di recti v e CF-2005-34 i ssued on 29 August 2005.

Ap p lic a b ility : Bombardi er Inc. DHC-8 Model s 102, 103, 106, 201, 202, 301, 311, 314 and 315 ai rcraft, Seri al Numbers 003 throu g h 557, equi pped wi th cockpi tdoor i n stal l a ti on, Part Numbers 82510074-(*), 82510294-(*), 82510310-001, 8Z4597-001, H85250010-(*), 82510700- ( * )

, or 82510704-(*), except 82510704-502 and 82510704-503.

Note: (*) denotes al l dash numbers.

Compl i ance: Compl i ance i s requi red as i ndi cated bel ow, unl ess al ready accompl i s hed.

Background: Duri ng structural testi n g of the cockpi t door, i twas observed that the door l o wer hi n g e bl ock rotated whi c h resul t ed i n di sen g a g ement of the mati n g hi n g e pi n and excessi ve door defl e cti on. The l o wer hi n g e bl ock rotated because i twas attached to i t s support structure wi th onl y one attachment bol t, whi c h prevented i tfrom reacti n g to an y moment force. Thi s condi ti on, i f not corrected, coul d resul t i n breaka g e and uncontrol l ed rel ease of the cockpi tdoor under certai n decompressi on si tuati ons.

After i n corporati on of Modsum 8Q900267 requi red b y Part B of thi s di recti v e, an operator reported a fai l u re to compl e te the cockpi tdoor removal functi on test. Thi s condi ti on, i f not

c o r r e c t e d

, c o u l d r e s u lt in th e in a b ilit y to remove the cockpi tdoor for emer g enc y e g ress. Therefore, Revi si on 1 of thi s di recti v e i s i ssued to requi re rework of the cockpi t door stri ker pl ate and repl acement of the l a tch bl ock for the affected ai rcraft seri al numbers. In addi ti on, thi s revi si on al so cl ari f i e s the Mods ums requi red pri o r to the i n corporati on of Part B.

Correcti v e Acti on: A. A ppl i c abl e to ai rcraft Seri al Numbers 003 throu g h 451, 453 throu g h 463, 465 through 489, 491 through 505, and 507.

Wi thi n 24 months after 29 September 2005 ( the effecti v e date of the ori g i nal i ssue of thi s di recti v e), unl ess al ready accompl i s hed:

Modi fy the cockpi tdoor si ngl e-poi nt hi nge attachment to a two-poi nt hi n g e attachment b y i n corporati n g Modsum 8Q100859. Bombardi er Servi c e Bul l e ti n ( SB ) 8-52-54, Ini t i a l Issue, dated 12 May 2004, Revi si on A, dated 5 November 2004, or l a ter revi si ons approved b y the Chi e f, Conti nui n g Ai rworthi ness, Transport Canada, provi des approved i n structi ons for i n corporati ng Modsum 8Q100859.

Note: Instal l a ti on of Modi fi cati ons 8/2337 and 8/3339 are requi red for ai rcraft Seri al Numbers 003 throu g h 407, 409 throu g h 412, and 414 throu g h 433, pri o r to the i n stal l a ti on of Modsum 8Q100859.No. N ° CF-2005-34R1 2/2

B. Appl i c abl e to ai rcraft Seri al Numbers 452, 464, 490, 506, and 508 through 557.

Wi thi n 24 months after 29 September 2005 (the effecti v e date of the ori g i nal i ssue of thi s di recti v e), unl ess al ready accompl i s hed:

Modi fy the cockpi tdoor si ngl e-poi nt hi nge attachment to a two-poi nt hi n g e attachment by i n corporati ng Modsum 8Q900267. Bombardi er SB 8-52-58, Ini t i a l Issue, dated 12 May 2004, or l a ter revi si ons approved b y the Chi e f, Conti nui n g A i rworthi ness, Transport Canada, provi des approved i n structi ons for i n corporati n g Modsum 8Q900267.

Note: Instal l a ti on of Modsums 8Q200015 i s requi red pri o r to the i n stal l a ti on of Modsum 8Q900267.

C. Appl i c abl e to ai rcraft Seri al Numbers 452, 464, 490, 506, and 508 through 557.

1. For ai rcraft that have al ready accompl i s hed Part B above as of the effecti v e date of thi s di recti v e:

Wi thi n 12 months from the effecti v e date of thi s di recti v e, rework the cockpi tdoor stri ker pl ate and repl ace the l a tch bl ock b y i n corporati n g Modsum 8Q902145. Bombardi er SB 8-52-61, Ori g i nal Issue, dated 20 October 2006 or l a ter revi si ons approved by the Chi e f, Conti nui ng Ai rwor thi ness, Transport Canada, provi des approved i n structi ons for i n corporati ng Modsum 8Q902145.

2. For ai rcraft that have not al ready acco mpl i s hed Part B above as of the effecti v e date of thi s di recti v e:

Carry out the requi rements of Part C, paragraph 1 above, concurrent wi th the Part B requi rements of thi s di recti v e.

Authori z ati on: For Mi ni ster of Transport, In frastructure and Communi ti es

Philip Tang Acti ng Chi e f, Conti nui ng Ai rworthi ness

Contact: Mr . Philip Tang, C ontinuing Airw or thines s , Ottaw a , telephone 613 952- 4365, fac s i mile 613 996-9178 or e-mai l tangp@tc.gc.ca or any Transport Canada Centre.