Transport Transports

Canada Canada

 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.

1/2 No.

CF-2014-03R1

Issue Date

24 July 2014

Number: CF-2014-03R1

ATA: 24 Type Certificate: A-142

Subject: Direct Current Starter/Generator – Terminal-Block Missing Insulating Sleeves

Effective Date: 7 August 2014

Revision: Supersedes AD CF-2014-03, issued 10 January 2014.

Applicability: Bombardier Inc. model DHC-8-102, -103, -106, -201, -202, -301, -311, -314 and -315

aeroplanes, serial numbers 003 through 672, with Terminal Block part number 

82450075-001 installed. 

Compliance: Within 2500 flight cycles or 14 months, whichever occurs first, from the effective 

date of this AD, unless already accomplished.

Background: There has been one in-service report of heat damage on a nacelle firewall found after an 

unsuccessful engine ground start. There have also been several reports of heat damage 

found on Direct Current Starter/Generator terminal block assemblies, part 

number (P/N) 82450075-001. 

The investigation determined that in all cases, the heat damage was caused by arcing 

between the firewall and terminal blocks with missing insulating sleeves on the conductive 

bushings. The insulating sleeves may have been inadvertently omitted during the 

incorporation of Modsum 8/1926, or during the installation of terminal 

blocks P/N 82450075-001.

Arcing with the firewall becomes an ignition source, creating a potential fire hazard when 

combined with a fuel or hydraulic fluid leak.

The original issue of this AD mandated the inspection and rectification, as required, of the 

nacelle firewall and terminal block assembly P/N 82450075-001 installed with 

Modsum 8/1926.

Revision 1 of this AD is issued to revise the Applicability to ensure that the terminal blocks 

have the insulating sleeves installed.

Corrective 

Actions:

A. Perform a detailed visual inspection of the right hand side and left hand side nacelle 

firewalls and terminal block assemblies in accordance with the Accomplishment 

Instructions in Bombardier Service Bulletin (SB) 8-24-92, Revision A, dated 

11 April 2014 or later revisions approved by the Chief, Continuing Airworthiness, 

Transport Canada.

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)
No.

N° CF-2014-03R1 2/2

B. If no damage is found on the engine firewalls and the terminal blocks, and the 

insulating sleeves are installed on both terminal blocks, no further action is required; 

compliance with this AD is complete.

C. If no insulating sleeves are installed, or the existing sleeves are damaged, and there 

is no damage to the nacelle firewall and terminal block, before further flight, install the 

replacement insulating sleeves in accordance with the Accomplishment Instructions 

of the above-mentioned SB. Compliance with this AD is complete.

D. If no insulating sleeves are installed and there is no damage to the nacelle firewall, 

but there is damage to the terminal block, before further flight, replace the terminal 

block assembly in accordance with the Accomplishment Instructions of the 

above-mentioned SB. Compliance with this AD is complete.

Note: The replacement terminal block assembly already includes insulating sleeves.

E. If no insulating sleeves are installed and there is damage to the nacelle firewall and 

the terminal block, contact the Bombardier Technical Help Desk for an approved 

repair and incorporate the repair before further flight. The approved repair must 

specifically reference this AD.

Inspection and rectification of the nacelle firewalls and terminal blocks, as required, in 

accordance with Bombardier SB 8-24-92, Initial Issue, dated 25 September 2013, prior to 

the effective date of this AD, also meets the requirements of this AD.

Authorization: For the Minister of Transport,

ORIGINAL SIGNED BY

Robin Lau

Acting Chief, Continuing Airworthiness

Contact: Robert Farinas, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

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