.+. Transport

Canada

Transports

Canada No.

CF~2009·35

Issue Dale

TP 7245E

I 1/3

AIRWORTHINESS

31 August 2009

DIRECTIVE

Number:

Subject:

Effective:

Applicability:

Compliance:

Background:

Corrective

Actions:

CF· 2009-35

Angle of Attack Transducer - Heating Element Degradation and Inaccurate

Calibration

16 September 2009

All Bombardier Inc. Model CL-BOO-2C10, CL..£OO-2D15and CL-600-2D24 aircraft

equipped with Thales Angle of Attack (ADA) transducers, Part Number (PIN)

C16258AA.

As indicated unless already accomplished,

The healing capability of several ADA transducer heating elements removed from

in-service aircraft has been found to be below the minimum requirement. Also, jt was

discovered that a large number of AOA transducers repaired in an approved

maintenance facility were not calibrated accurately.

Inaccurate calibration of the ADA transducer andlor degraded AOA transducer heating

elements can result in early or late activation of the stall warning, stick shaker and stick

pusher by the Stall Protection Computer (SPC),

This directive mandales a periodic inspection of the inrush current to verify the ADA

heating capability and replacement of the inaccurately calibrated AOA transducers,

1. Angle of Attack Transducers Calibration Part Number (PIN) C16258AA

1.1 Within 6 000 hours air time from the effective date of this directive, perform the

following in accordance with the Accomplishment Instructions of Bombardier

Service Bulletin (S8) 670BA-27-053, dated 14 May 2009 or later revisions

approved by the Chief, Continuing Airworthiness, Transport Canada:

Inspect the part number and the serial number (SIN) of each of the ADA

transducers PIN C16258AA installed on the aircraft.

111 If the SIN is not listed in paragraph 1 A.(1} of SB 670BA-27-053,

dated 14 May 2009 or later revisions approved by the Chief.

Continuing Airworthiness, Transport Canada, or if a different part

number is installed, no further action is required.

1.1.2 If the PIN and the SIN are listed in paragraph 1.A.(1) of

S8 670BA-27-053, dated 14 May 2009 or later revisions approved

by the Chief, Continuing Airworthiness, Transport Canada, and the

serial number has a suffix "A" (reference: Thales S8

C16258A-27-002), no further action is required.

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I~. CF·2009·35

1.1.3 If the PIN and the SIN are listed in paragraph 1.A.(1) of the

SB 670BA·27..Q53,dated 14 May 2009 or later revisions approved

by the Chief, Continuing Airworthiness. Transport canada. replace

the AOA transducer in accordance with the Accomplishment

Instructions, Part 2 Paragraph 8.(2) of the above mentioned S8 or

its later revisions approved by the Chief, Continuing Airworthiness,

Transport Canada.

1.2 As of the effective date of this directive, no person shall install a replacement

ADA Transducer PIN C16258AA with a SIN listed in paragraph 1.A(1) of

Bombardier SB 670BA-27-0s3, dated 14 May 2009 or later revisions approved

by the Chief, Continuing Airworthiness. Transport Canada, unless the serial

number has the suffix "A" (reference: Thales S8 C16258A-27-002).

2. Angle of Attack Transducers Heating Element Degradation PIN C16258AA

2.1 Inspection for Inrush Current

In accordance with the schedule in Table 1 below, measure the inrush current

of the installed AOA transducers in accordance with the Accomplishment

Instructions, Part A, of Bombardier SB 670BA-27-0s1, dated 14 May 2009 or

later revisions approved by the Chief, Continuing Airworthiness, Transport

Canada.

Table 1

Accumulated Angle of Attack Compliance Schedule for Initial Inrush

transducer Hours Air Time on the Current Inspection

Effective Date of this directive.

Less than 6 500 hours air time Before the ADA transducer has 7 500 hours

air time

More than or equal to 6 500 but not Within 500 hours air time from the effective

greater than 7 500 hours air time date of this directive but no later than 8 000

hours air time

More than or equal to 7 500 hours air Within 250 hours air time from the effective

time date of this directive

2.2 Replacement and Repeat Inspection Requirements:

2.2.1 If the installed ADA transducers inspected as per Table 1 have an inrush

current less than 1.60 Amps, before further flight, replace them in

accordance with the Accomplishment Instructions, Paragraph 2. Part C,

of Bombardier SB 670BA-27-051. dated 14 May 2009 or later revisions

approved by the Chief, Continuing Airworthiness, Transport Canada.

Repeat the inspection of the newly installed transducers in accordance

with the schedule in Table 2 of this directive.

2.2.2 If the ADA transducers inspected as per Table 1 have an inrush current

more than or equal to 1.60 Amps, repeat the inspection of the

transducers in accordance with the schedule in Table 2 of this directive
I~·CF-2009-35 I~

Authorization;

Contact:

Table 2

last Angle of Attack Inrush Current Compliance Schedule 1o, Repeat

Measurement (Amps) Inspection

More than or equal to 1.90 Within 2 000 hours air lime after the last

measurement.

More than or equal to 1.80 but less than Within 1 500 hours air time after the last

1.90 measurement.

More than or equal to 1.70 bulless than Within 1 000 hours air time after the last

1.80 measurement.

More than or equal to 1.60 bul less than Within 500 hours air time after the lasl

1.70 measurement.

New ADA Transducer Within 2 000 hours air time after the

installation date.

For Minister of Transport, Infrastructure and Communities

Derek Ferguson

Chief, Continuing Airworthiness

Mr. Gordanko Jeremic, Continuing Airworthiness, Ottawa, telephone 613-952-4357,

facsimile 613-996-9178 or e-mail CAW WEB Feedback@tc.gc.ca or any Transport

Canada Centre.