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 TP 7245E

 

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) 521 Division X. 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), National 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)

1/2 No.

CF-2010-25

Issue Date 

 3 August 2010 

Number: CF- 2010-25 

Subject: AC Electrical Load Distribution 

Effective: 24 August 2010 

Applicability: Bombardier Inc. CL-600-2B16 Serial Numbers 5701 through 5752, 5754 through 

5775, 5777, 5779 through 5781, 5783 through 5790, 5792, 5794 through 5796, 5798, 

5801, and 5804

Compliance: As indicated below unless already accomplished 

Background: During pre-delivery inspections and test flights, several short circuit events were 

reported, one of which resulted in smoke in the cockpit. There were no in-service 

incidents. 

Investigations have identified three conditions affecting the wiring of Circuit Breaker 

Panels 1, 2, 3 and 4 (CBP-1, CBP-2, CBP-3, and CBP-4) and Junction Boxes 17 and 18

(JB17 and JB18), which would lead to short circuiting: 

1. In CBP-1, there may be low clearance between specific bus bars and the circuit 

breaker panel structure. 

2. Some nickel-plated terminal lugs, size number 22-20 with a green insulating sleeve, 

may not have been manufactured to applicable standards. These terminal lugs may 

have been installed in CBP-1, CBP-2, CBP-3, CBP-4, JB17 and JB18. This 

manufacturing defect affects the mechanical hold of the wire in the crimped lug barrel.

3. In JB17, JB18 and the above-mentioned CBPs, foreign object debris (FOD) may be 

found. 

If not corrected, these conditions could result in arcing, damage to adjacent structure, 

smoke in the cockpit, or loss of system redundancies. 

This directive is issued to mandate the replacement or relocation of the specific CBP-1 

bus bars, the inspection, and rework if necessary, of any loose or improperly crimped 

lugs in CBP-1, CBP-2, CBP-3, CBP-4, JB17 and JB18, and to ensure there is no FOD in 

the affected areas. 
No.

 N° CF-2010-25 2/2 

Corrective 

Actions: 

A. Inspection of Loose and Improperly Crimped Terminal Lug Connections and for

FOD in CBP-1 and Replacement or Relocation of Bus Bars: - Applicable to

Serial Numbers 5701 through 5752, 5754 through 5775, 5777, 5780 through 

5781, 5783 through 5790, 5792, 5794 through 5796, 5798, 5801, and 5804 

Within 800 hours air time after the effective date of this directive, inspect for FOD, 

replace any loose or badly crimped lugs, and relocate or replace the CBP-1 bus bars 

in accordance with the Accomplishment Instructions of the Bombardier Service 

Bulletin (SB) 605-24-004, dated 18 January 2010, or later revisions approved by the 

Chief, Continuing Airworthiness, Transport Canada. 

B. Inspection of Loose and Improperly Crimped Terminal Lug Connections and for 

FOD in CBP-2, CBP-3, CBP-4, JB17 and JB18: - Applicable to Serial Numbers 

5701 through 5752, 5754 through 5756, 5758 through 5775, 5779, 5781, 5788, 

5789, 5792, 5795, 5798, 5801 and 5804 

Within 800 hours air time after the effective date of this directive, inspect for FOD and 

replace any loose or badly crimped lugs in CBP-2, CBP-3, CBP-4, JB17 and JB18 in 

accordance with the Accomplishment Instructions of the Bombardier SB 605-24-002, 

dated 07 December 2009, or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada. 

Authorization: For Minister of Transport, Infrastructure and Communities 

ORIGINAL SIGNED BY

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: Miss Helen Tsai, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

613-996-9178 or e-mail CAWWEBFeedback@tc.gc.ca or any Transport Canada Centre.