.+. Transport

Canada

Transports

Canada No

CF-2010-20

IssueOale

19 July 2010

TP 7245E

I 1/2

AIRWORTHINESS DIRECTIVE

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registered ain;rafi i.a;mllnQenl upon CQmpi<ance WlUl 311applicable AO •. Failure 10 <:omlly with the requi<ements of anAgg ma~ Invalldale Ine fifg~1 '"Ill>olit"~on of II'>e .;,c",11

Aliemaliwmean.ofcompllanceSllollbe ••pplisdforinaccor!J.nce\lOlnCARGO~.1l4an 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

4 August 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 in the HSTAjam leading to diffidulties 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) 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 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 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 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 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 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;

Porsu.nllO CAR 'Q2,51 the reqislemd owner of a Canadian aircraft sh.II, wlll,lnseven ~'yS.nolilyIhe Mlnlsle,

In"""ing oh"~ chnnge or hi. Ofher Mme or adclre«

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24--0022101_20051

Canada