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AIRWORTHINESS DIRECTIVE

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your name. ADs are issued pursuant to Canadian 

Aviation Regulation (CAR) 593. Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H, the continuing airworthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD may invalidate the flight authorization of the aircraft. Alternative means of compliance shall be applied for in accordance with CAR 605.84 and the above-referenced Standard. 

This AD has been issued by the Continuing Airworthiness Division (AARDG), Nationnal Aircraft Certification Branch, Transport Canada, Ottawa, telephone 613 952-4357.

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall, within seven days, notify the Minister in writing of any change of his or her name or address. 

To request a change of address, contact the Civil Aviation Communications Centre (AARC) at Place de Ville, Ottawa, Ontario K1A 0N8, or 1-800-305-2059, or www.tc.gc.ca/civilaviation/communications/centre/ address.asp 

24-0022 (01-2005)

1/3 No.

CF-2009-37

Issue Date 

 30 September 2009 

Number: CF-2009-37 

Subject: Wing Anti-Ice System – Outboard Low-Heat Detection Switches

Effective: 16 October 2009 

Applicability: Bombardier Inc. Model CL-600-2B19, Serial Numbers 7003 through 8101 

Compliance: As indicated below, unless already accomplished. 

Background: At present, the Wing Anti-Ice System (WAIS) sufficient heat switches/sensors on 

CL-600-2B19 aircraft are located at the inboard end of each wing and require a 

simultaneous low-pressure signal to generate a L or R WING A/ICE amber caution. 

However, there have recently been several in-service occurrences that have highlighted 

the inability of the existing system to detect a low-heat condition in the wing leading edge 

at all times, with the potential consequence of unannunciated asymmetric ice build-up on 

the wing. These have included partial failure of several piccolo ducts [ref: Airworthiness 

Directive (AD) CF-2008-30] and partial (not fully closed or open) failure of a modulating 

and shut-off valve, the latter resulting in unannunciated asymmetric ice build-up on the 

wing leading edge. Such a condition, in combination with maneuvers close to stick 

shaker activation, could possibly result in reduced controllability of the aircraft. 

This directive mandates: 

a) Revision of the Airplane Flight Manual (AFM) to notify the flight crew that, following 

installation and activation of the low-heat detection switches, certain WAIS mode 

selection changes may result in a two-minute inhibition of the wing anti-ice message, 

if posted; 

b) Revision of the approved maintenance schedule to include one revised and three 

new functional checks that are required following activation of the low-heat detection 

switches; 

c) Replacement of the Data Concentrator Units (DCUs) with DCUs incorporating a 

software update that caters for the new outboard low-heat detection switches and 

generates the appropriate anti-ice message for the flight crew when a low-heat 

condition is detected; 

Note: Although not related to this directive, the software update also corrects the 

sampling rate of two previously non-compliant Flight Data Recorder (FDR) 

parameters, normal acceleration and pitch attitude. 

d) Installation of the low-heat detection switches in the wing outboard leading edges, 

the wing A/ICE box assembly and associated wires; and 

e) Activation of the low-heat detection switches. 
No.

 N° CF-2009-37 2/3 

Note: Within the constraints of the compliance times specified below, each Part of this 

directive may be accomplished separately from the other Parts. 

Corrective 

Actions: 

Part I: Airplane Flight Manual (AFM) Revision: Applicable to CL-600-2B19 Aircraft, 

Serial Numbers 7003 through 8101 

Within 30 days after the effective date of this directive: 

A. Amend the AFM, CSP A-012, by inserting Temporary Revision (TR) No. RJ/164-2, 

dated 12 May 2009, or later approved changes to this TR; and 

B. Advise all flight crews of the changes introduced in the AFM TR. 

Part II: Maintenance Schedule Revision: Applicable to CL-600-2B19 Aircraft, Serial 

Numbers 7003 through 8101 

Within 30 days after the effective date of this directive: 

Revise the Transport Canada approved maintenance schedule by incorporating the 

inspection requirements contained in TR 2A-46, dated 24 July 2009, of the Maintenance 

Requirements Manual, CSP A-053, Part 2, Appendix A, Certification Maintenance 

Requirements. 

Part III: Replacement of the Data Concentrator Units (DCUs) - Applicable to 

CL-600-2B19 Aircraft, Serial Numbers 7003 through 8095 

Prior to accomplishment of Part V of this directive but no later than 1 November 2010: 

Replace the existing DCUs (Part Numbers (P/N) 622-9820-007 and/or –008 and/or -009) 

with modified DCUs (P/N 622-9820-010) and also, if applicable, modify the Configuration 

Strapping Units (CSUs), in accordance with the Accomplishment Instructions in 

Bombardier Service Bulletin (SB) 601R-31-034, Revision A, dated 10 April 2008, or later 

revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 

Notes: 1. The modified DCUs have been installed in production on CL-600-2B19 aircraft, 

serial numbers 8096 and subsequent. 

 2. Accomplishment in accordance with the original issue of Bombardier SB 

601R-31-034, dated 19 November 2007, also meets the intent of Part III of this 

directive. 

Part IV: Installation of Low-Heat Detection Switches in the Wing Outboard 

Leading Edges, Wing A/ICE Box Assembly and Associated Wires - 

Applicable to CL-600-2B19 Aircraft, Serial Numbers 7003 through 8101 

Prior to accomplishment of Part V of this directive but no later than 1 November 2010: 

Install the outboard low-heat detection switches, wing A/ICE box assembly and 

associated wires in accordance with the Accomplishment Instructions in Parts A, C, D 

and E of Bombardier SB 601R-30-031, Revision A, dated 8 September 2009, or later 

revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 

Notes: 1. Accomplishment of Parts A, C, D and E of Bombardier SB 601R-30-031, 

Revision A, dated 8 September 2009, or later revisions approved by the 

Chief, Continuing Airworthiness, Transport Canada, may be performed 

separately from each other. 
No.

 N° CF-2009-37 3/3 

2. Accomplishment in accordance with Part A of the original issue of Bombardier 

SB 601R-30-031, dated 15 May 2009, also meets the intent of Part IV of this 

directive. 

 

 3. There have been a small number of cases reported in which piccolo ducts 

were found to have been installed in the opposite wing, resulting in the 

incorrect orientation of the bleed holes. During reinstallation of the piccolo 

ducts and leading edge assemblies after installation of the low-heat detection 

switches, particular attention should be paid to the correct alignment of the 

piccolo ducts [Ref: Aircraft Maintenance Manual Task 30-11-41-820-801]. 

Part V: Activation of the Low-Heat Detection Switches in the Wing Outboard 

Leading Edges - Applicable to CL-600-2B19 Aircraft, Serial Numbers 7003 

through 8101 

Following accomplishment of Parts III and IV of this directive but no later than 1 

November 2010: 

Activate the outboard low-heat detection switches in accordance with the 

Accomplishment Instructions in Part F of Bombardier SB 601R-30-031, Revision A, 

dated 8 September 2009, or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada. 

Note: Accomplishment in accordance with Part B of the original issue of Bombardier SB 

601R-30-031, dated 15 May 2009, also meets the intent of Part V of this directive.

 

Authorization: For Minister of Transport, Infrastructure and Communities 

Derek Ferguson, 

Chief, Continuing Airworthiness 

Contact: Mr. Richard Topham, 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.