# 1+1 Transports Canada Transport Canada TP 7245E 

### 1 Of 

### 2 AD Number: CF-2014-42 Issue Date : 28 November 2014 

# AIRWORTHINESS DIRECTIVE
Th e tono• .v\n g airwo rth i nes s di rective CAO ) may be aQpl i cablc to an ai rcraft whl dl o ur reCOfdS ind i cate i s reg i ste red in yo u r name . ADs are iss.u ed pu rs . u ant to Canadian Aviation Regulation (CAR) 521 Divi si on X
. F'ursu a nt to CAR 605.84 an d th e fu rther details o f CAR Sta ndard 625, Appendix H
. the con bnui n g aitWO rthi n ess of a Canad i an reg i stered a i r

craft is con tingent u pon co mp l iance with all appl i cable AD s . Fail u re to comp l y v.1 th th e r eq ui reme n ts of an AD m ay i nval idate th e flig ht autho rizabon of the ai raaft Alte m a bve mea n s o f com plia nce sh a ll l>e appl ied fo r in accor d ance with CAR 605
. 84 and the above- reference d Standard
. Th i s AD has l>een i ssued l>y the Con ti nu i n g Ai 1 worth i ness Divi sion (AAR DG)
. National Ai r cra ft Ce rtifica ti o n Branch
. Transport Canada
. O ttawa . te l ephon e 6 1 3 952
-4357 . Number: CF-2014-42 Effective Date: 12 December 2014 ATA: 32 Type Certificate: A - 131 Subject: Landing Gear- Main Landing Gear Door Forward Member Cracking Applicability: Bombardier Inc. model CL-600-2C10 aeroplanes, serial number 10002 and subsequent , equipped with inboard Main Landing Gear (MLG) door part numbers included i n Section 1.A, Effectivity, of Bombardier Service Bulletin (SB) 670BA-32-042 , Revision 

### A. dated 2 July 2014
. Compliance: As indicated below, unless already accomplished. Background: Cases of inboard MLG doors with cracked door forward members were found
. A cracked inboard MLG door forward member could result in door departure from the aeroplane
. Loss of an MLG door during flight could result i n damage to the aeroplane and inju ry to persons on the ground. This AD mandates the repetitive inspect ion and replacement of the inboard MLG doors
. Corrective Actions: Part I - Repetitive Inspection Perform a detailed visual inspection of the inboard MLG doors, and rectify as required , in accordance with the Accomplishment Instructions of Bombardier SB 670BA-32-042 , Revision 

### A. dated 2 July 2014, or later revisions approved by the Chief , Continuing Airworthiness , Transport Canada , using the following schedule : A. Initially , within 660 hours air time or one year , whichever occurs first , from the effective date of this AD ; and B. Subsequently, at intervals not to exceed 660 hours air time or one year , whichever occurs first. Part I of this AD is not required if the MLG door has been removed. This alleviation is applicable only to the removed MLG door
. The repetitive i nspection in accordance with Part I of this AD resumes when the MLG door is reinstalled. If the compliance time of Part II of this AD is reached at the time of the MLG door reinstallat io n , complete Part I I of this AD
. Part II- Terminating Action Within 6600 hours air time or 3 years , whichever occurs first , from the effective date of this AD , replace the inboard MLG doors in accordance w ith the Accompl is hment Instructions of Bombardier SB 670BA-32-043 Revision A , dated 13 November 2014 , or later revisions approved by the Chief , Continu in g Airworthiness, Transport Canada
. If the MLG door has been removed at the compliance time of Part II of this AD , incorporation of the above-mentioned replacement can be delayed until the MLG door is reinstalled
. This alleviation is applicable only to the removed MLG door
. Pu rsua nt t o CA R 202.51 th e reg i ste red owner o f a Canadi an ai rcraft shal l. withi n seve n d ays . notify the Min i ste r 1 n wri ting o f an y ch an g e of hi s or h er n a me o r address . 

# Canad a For al l changes to yo ur m ailing address . con tact your TC Reg,onal Ai rcra ft Reg i Stratio n Office at t - 800
- 305
-2059. op ti o n 1 for E n gl iSh , 2 for Aircraft Reg l svati on an d th en seleCI the a ppropria te region
. 2 4
-!>022 (01
- 2005)CF-2014-42 2 of 2 Part II of this AD constitutes termina ting action to t his AD. Part I of this AD is no longer required after accomplishment of Part II of this AD. Note: Incorporation of Bombardier SB 670BA-32-040 is still required to meet the requirements of Part IV of AD CF-2010-36R1. Part Ill - Alternative Means of Compliance The following are acceptable options which meet the requirements of Part II of this AD: A. Incorporat ion of Bombardier SB 670BA-32-043 , Initial Issue , dated 2 July 2014, i n conjunction with ModSum 18670528200033; B
. Installation of inboard MLG door assembly with part numbers listed in the " Post-SB Part Number" column of Section M , Relationship Chart, of Bombardier SB 670BA-32-043, Initial Issue, dated 2 July 2014; C. Incorporation of Part C and Part D of the Accomplishment Instruct ions of Bombardier SB 670BA-32-040 , Revision E, dated 13 November 2014, or later revisions approved by the Chief , Continuing Airworthiness , Transport Canada ; or D. Incorporation of Part C and Pa rt D of the Accomplishment Instructions of Bombardier SB 670BA-32-040 , Revision D , dated 2 July 2014, in conjunction with ModS um IS670528200033
. Part IV- Spares Upon completion of Part II or Part Ill of this AD, it is prohibited for anyone to install inboard MLG door assemblies with part numbers listed in the " Pre-SB Part Number" column of Section M , Relationsh i p Chart, of Bombardier SB 670BA-32-043, Init ial Issue, dated 2 July 2014
. Authorization: For the Minister of Transport ,

Contact: ORIGINAL SIGNED BY Derek Ferguson Chief , Continuing Airworthiness Helen Tsai , Continuing Airworthiness , Ottawa, telephone 613-952-4357, facsimile 613- 996-9178 or e-mail AD-CN@tc
. gc .ca or any Transport Canada Centre
.