# ••• Transport Canada Transports



### Canada No.
Issue Dale 19July 2010TP 7245E 

# I 1/2 

# AIRWORTHINESS DIRECTIVE ~ia~~'~~~:'=~;2:~)

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### ""AgS m.y in,elida'. 1M fiigR, aulhon"tion of !he o;,crall Allernahw me3ns of oompli3r>ceShall baappl",~ fO'm accordance •••!h CAR 605.B4 and Itlfl al:>ov.~rer.nc.d Sta"da,d, ThisADh.s b@.ni••uedoytMContinulng Airworthiness ~viSlon (AAROGI. Nalio",,1M"."f( Certification aranch, Tran'port C'mada, Ottaw8. telephone 513 952-4357. 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-600-2D1S and CL-600-2D24 aeroplanes equipped with HSTA part number 8489·7 o'r8489-7R. 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 difficulties incontrolling 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) ofthe HSTA part number (PIN) B489'~7and 8489-7R in accordance with paragraph 1.A. of Bombardier Service Bulletin (S8) 670BA-27-DS?, dated 28 April 2010 or later revisions approved by the Chief, Continuing AilWorthiness, Transport Canada. Verification ofthe SIN and PIN ofthe HSTA may be accomplished by visual check ofthe HSTA SIN and PIN on the aeroplane orbyIreviewingthe 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 Cofthis directive. B. Ifthe SIN is listed in paragraph 1.A. ofthe above mentioned S8 or its later approved revisions, accomplish the following: 1. Forthe aircraft with HSTAthat have accumulated less than orequal 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 S8 or its laterapproved 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 next2000 flight cycles, but no laterthan 11 000 flight cycles in accordance with paragraph 2 of the above mentioned S8 or its later approved revisions;

Pursuant 10CAR 102.51 Ine regiSlar<>downer 013 C"n.~i3n aircraft """II, wiUlln seven d8YS. notify irJ, Mi,,;sler ,nwrll'09 of any en8nge of Misor her name cr ad~ress. 

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# Canada

# I No. 

### CF·2010·20 N>

Authorization:

Contact: 3. Forthe aircraft with HSTAthat have accumulated more than 10 000 flight cycles. but not more than 12 000 flight cycles on the effective date of this directive, replace the HSTA within next 1000 flight cycles, but no later than 12 500 flight cycles in accordance with paragrC:1ph 2 of the above mentioned S8 or its later approved revisions; 4. Forthe aircraft with HSTAthat have accumulated more than 12 000 flight cycles on the effective date of this directive, replace the HSTA within next 500 flight cycles in accordance with paragraph 2 of the above mentioned S8 or its later approved revisions. C. As ofthe effective date of this directive, no person shall install a replacement HSTA PIN 8489·7 or 8489·7R with a SIN listed in paragraph 1.A. of Bombardier SB 670BA· 27·057, dated 28 April 2010 or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. For Minister ofTransport, Infrastructure and Communities OR1G1N

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\.L~IGNED BY Robin Laufor Derek Ferguson Chief, Continuing Airworthiness Mr. Gordanko Jeremic, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 613-996·9178 or e-mail CAWWEBFeedback@tc.gc.ca or any Transport Canada Centre.