••• Transport

Canada

Transports

Canada No.

Issue Dale

19 July 2010

TP 7245E

I 1/2

AIRWORTHINESS DIRECTIVE

~ia~~'~~~:'=~;2:~) ~~i'i:);i;i~~1 rtu~.:.,:~r::;"'J'!ik'~o~~S~;,cn~~~i~h:rd~~~dgf ~~R~"t.:~J:~~·~i5,d inV~~~,iH~'li.e ~~ti~~"i·~~~o~~r~~:~=\~~ regi.ler.O .ircran OSoonllnQenl upon co,npl,an.ce wilt> 311appllca~le AD •. Failure to comply WIIh thei,aqui",ment. of ""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,

This AD h.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

4 August 2010

All Bombardier Inc. Models CL-600-2C10, CL-600-2D1S and CL-600-2D24 aeroplanes

equipped with HSTA part number 8489·7 o'r 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 in the HSTA jam leading to difficulties in controlling the aircraft.

This directive mandates incorporation of the HSTA with 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) B489'~7 and 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 of the SIN and PIN of the HSTA may be accomplished by visual check of the

HSTA SIN and PIN on the aeroplane or by Ireviewing 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 of this directive.

B. If the SIN is listed in paragraph 1.A. of the above mentioned S8 or its later approved

revisions, accomplish the following:

1. For the aircraft with HSTA that 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 S8

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 HSTA within 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;

Pursuant 10CAR 102.51 Ine regiSlar<>d owner 013 C"n.~i3n aircraft """II, wiUlln seven d8YS. notify irJ, Mi,,;sler

,n wrll'09 of any en8nge of Mis or her name cr ad~ress. I

~ip(.'ree~~avlil:~~~db""S~'ri';;'~t~ 6~8~~~I\!i~~:i~~.ig~~un;<3tions cenlTe(AARC)

or www.t<:.g<:.<iII<:ivil.vi.~oru<ommunl ••••~OI1$I<erweJ add"'U.asp

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Authorization:

Contact:

3. For the aircraft with HSTA that 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:1ph2 of the above mentioned S8 or its later

approved revisions;

4. For the aircraft with HSTA that 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 of the 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 of Transport, Infrastructure and Communities

OR1G1N..\.L~IGNED BY

Robin Lau for

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.