# 1+1 Transport Canada Transports

Canada CF-2010-12 Issue Date 6 May 2010 TP 7245E

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# AIRWORTHINESS DIRECTIVE ~~7a~~'~~~';I~~1g't:f)

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### Kgmal' ,nvalid.,e I!lefb;;g,ou!hCII,"i,on of,he Mcraft illt.mat'VIO mean, ofcompliance sMI Deappl'ed fm ," accorcla~ce with CAR 605.84 ~nd tOE'bo",,_mt.'enced Stanoord n,i, AD has been ",ued by the CCOi1nUII'9Ai""o~nine" Dil'lsion tAARDG), N.llonnal AIr<l"anCermica""n Branch, T,an'pon C",ada. Qn~wa. t.lepnorw61J 852-'1357 Number: Subject:

Effective: Applicability Compliance: Background:

Corrective Actions: CF-2010-12

Wing Leading Edge Thermal Switches and Wing Anti·lce Duct Piccolo Tubes

- Airworthiness Limitation Tasks 26 May2010 Bombardier Inc. Model: CL-600-2B19, Serial Numbers 7003 and subsequent As indicated below, unless already accomplished. During flighHesting ofawing anti-ice piccolo lube containing adeliberate small breach, it was determined that the wing leading edge thermal switches Part Number (PIN) 601 R59320-1 were not detecting the consequent bleed leak at the design threshold, As a result, Airworthiness Liinitation (AWL) tasks, consisting of a functional check of the wing leading edge thermal switches (PIN 601R59320-1) and an inspection ofthe wing anti-ice duct piccolo tubes on aeroplanes with these switches installed, have been introduced. These tasks will limit exposure to dormant failure ofthe wing leading edge thermal switches inthe event of piccolo tube failure, which eouid potentially compromise the structural integrity ofthe wing leading edge and the effectiveness ofthewing anti-ice system. This directive mandales revision of the approved maintenance schedule to include the above referenced tasks, including phase-in schedules that supersede the phase-in schedules specified intheAWLtasks, Note: Thermal switches, PIN 601R59320-1, were installed in production on aircrafi Serial Numbers (SIN) 7213 and subsequent. Service Bulletin 601R-30-()22 covered in-service installation of these switches on aircraft SINs 7003 through 7212. A. Revision of Maintenance Schedule Within 30days afterthe effective dateofthis directive: Revise the Transport Canada approved maintenance schedule by incorporating the thermal switch functional check and piccolo tube inspection requirements (task number:; identified below) contained in the applicable Temporary Revision (TR) to the Maintenance Requirements Manuai (MRM), CSP A-053, Part 2, Appendix A, Certification Maintenance Requirements, asfollows:

• MRMTR 2A-SO,dated 17November 2009: Task Number C36-20-133-03

• MRMTR 2A-49, dated 17November 2009: Task Number C30-10-133-01 B. Phase-In Schedule The phase-in schedules for the initial functional check ofthe thermal switches <lnd the initial inspection of the piccolo tubes, as detailed below, supersede those specified in Paragraphs 1 and2 of MRMTRs 2A-50 and 2A-49:

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### ~ I 1) Functional Check oftheThermal Switches (Task Number C36-20-133-03) (a) For aeroplanes thai have 15 000 Flight Hours (FH) or less at the effective dale ofthis directive, dothe initial functional check ofthe lhermai switches by 15 000 FHor by 31 December 2010, whichever occurs last, (b) For aeroplanes that have more than 15 000 FH at the effective date of this directive. do the initial functional check of the thermal switches by 31 December 201 D. 2) Inspection ofthe PiccoloTubes (Task Number C30-10-133-01) (a) For piccolo tubes that have 15 000 FH or less at the effective dale of this directive, do the initial inspection by 15 000 FH or by 31 December 2010, whichever occurs last. (b) For piccolo lubes that have more than 15 000 FH at the effective date of this directive, do the initial inspection by 31 December 201 D. Notes: Noles 1. and 2. in MRM TR 2A-49 remain applicable,

2. Compliance with superseding TRs or later revisions of the MRM, approved by Transport Canada, also satisfies the requirements of this directive. Authorization: For Minister ofTransport, Infrastructure and Communities

OR1G1N:\L SIGNED BY Derek Ferguson Chief, Continuing Airworthiness 

### Contact Mr. Richard Topham, Continuing Airworthiness, Ottawa, telephone 613-952-4357,

facsimile 613-996-9178 or e-mail CAVVWEBFeedback@lcgc.ca or any Transport Canada Centre

.