# .+. Transport Canada Transports

Canada No CF-2010-20 IssueOale 19July 2010TP 7245E 

# I 1/2 

# AIRWORTHINESS DIRECTIVE ~~!";;~'~'Il~u~~g::1~lW)



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## g,'.'.~~~ registered ain;rafi i.a;mllnQenl upon CQmpi<ance WlUl 311applicable AO•. Failure 10<:omlly with the requi<ements ofanAgg ma~ Invalldale Ine fifg~1 '"Ill>olit"~on of II'>e.;,c",11 Aliemaliwmean.ofcompllanceSllollbe •• pplisdforinaccor!J.nce\lOlnCARGO~.1l4 an 1Ma"","·,e1erenced St.<>dOfd. This AD has beM i"ued ")'t"" Continuing Airworthiness []vis<oo IAARDGI. National Aircrafl Cenlficalion Branch, T",n'po,t Canada, Ottawa, teleptlone 613 952.4357_ Number: Subject:

Effective: Applicability: Compliance: Background:



### Corrective Actions; Horizontal Stabilizer Trim Actuator (HSTA)

- Assembly of Discrepant Load Bearing

Balls in the HSTA 4August 2010 All Bombardier Inc. Models CL-600-2C10, CL-600-2D15 and CL·600~2D24 aeroplanes equipped with HSTA part number 8489·7 or 8489·7R. As indicated below, unless already accomplished. During maintenance at the vendor's facility, some HSTAs were assembled with the incorrect load bearing balls. The material of these discrepant balls has lower wear characteristics and as such, has a shorter expected life. If not corrected, this condition can result inthe HSTAjam leading to diffidulties in controlling the aircraft. This directive mandates incorporation ofthe HSTAwith the correct load bearing balls. Within 500 flight cycles from the effective date of this directive, verify the serial numbers (SIN) of the HSTA part number (PIN) 8489-7 and 8489~7R in accordance with paragraph 1A of Bombardier Service Bulletin (58) 670BA-27~057, dated 28 April 2010 or later revisions approved by the Chief. Continuing Airworthiness, Transport Canada. Verification ofthe SIN and PIN of the HSTA may be accomplished by visual check ofthe HSTA SIN and PIN on the aeroplane or by reviewing the maintenance records. A. If the SIN is not listed in paragraph 1.A. of the above-mentioned S8 or it's later approved revisions, no further action is required other than compliance with paragraph C ofthis directive. B. Ifthe SIN is listed in paragraph 1.A. ofthe above mentioned S8 or its later approved revisions, accomplish thefollowing: 1. Forthe aircraft with HSTAthat have accumulated less than or equal to 8000 flight cycles on the effective date of this directive, replace the HSTA before it reaches 10 000 flight cycles in accordance with paragraph 2 of the above mentioned SB or its later approved revisions; 2. For the aircraft with HSTA that have accumulated more than 8000 flight cycles, but not more than 10 000 flight !cycles on the effective date of this directive, replace the HSTAwithin the next 2000 flight cycles, but no later than 11 000 flight cycles in accordance with paragraph 2 of the above mentioned S8 or its later approved revisions;

Porsu.nllO CAR'Q2,51 the reqislemdownerofa Canadianaircraftsh.II, wlll,ln seven ~'yS.

nolilyIheMlnlsle, In"""ing oh"~ chnnge orhi. Of her Mme oradclre« 

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