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.

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-2010-30R1

Issue Date 

 21 September 2010 

Number: CF- 2010-30R1 

Subject: Cracking of the Nacelle Attachment Fitting(s) 

Effective: 28 September 2010 

Revision: Supersedes Airworthiness Directive (AD) CF-2010-30, dated 27 August 2010. 

Applicability: Bombardier Inc. DHC-8 Aeroplanes, Model 400, 401 and 402, serial numbers 

4001 and subsequent. 

Compliance: As indicated below, unless already accomplished. 

Background: Several reports have been received of cracked nacelle attachment fittings. The 

preliminary investigation determined the cause to be stress corrosion. Stress corrosion 

cracking could compromise the structural integrity of the nacelle attachment fitting and 

could adversely affect the safe landing of the aeroplane. 

This directive, in the interim, mandates a detailed visual inspection and conductivity 

check of each of the four (4) nacelle attachment fittings. 

Revision 1 of this directive is issued to update the aircraft serial number (S/N) 

applicability based on the latest crack findings and also to revise the acceptable 

conductivity values in Part I. A. In addition, Part II. has been added to provide instructions 

for newly affected aircraft and aircraft that have replaced nacelle attachment fittings.

Corrective 

Actions: 

Part I - Applicable to Aircraft 4001-4304, 4314 and 4315: 

A. Detailed Visual Inspection and Conductivity Check of the Nacelle Attachment 

Fitting Assembly Part Number (P/N) 85414663: 

Within 100 hours air time from the effective date of this directive, conduct a Detailed 

Visual Inspection (DVI) and conductivity check on each of the four (4) nacelle 

attachment fittings, in accordance with the accomplishment instructions in section 3 

of the Bombardier Service Bulletin (SB) 84-54-14 Rev J dated 17 September 2010, 

or later revisions approved by the Chief, Continuing Airworthiness, Transport 

Canada. 

1. If any nacelle attachment fitting is found cracked, replace the cracked fitting in 

accordance with the accomplishment instructions in section 3. B. Part A. (3) of 

the Bombardier SB 84-54-14 Rev J dated 17 September 2010 or later revisions 

approved by the Chief, Continuing Airworthiness, Transport Canada, prior to next 

flight, and proceed to Part II of this directive. 
No.

 N° CF-2010-30R1 2/3 

tting(s) 

2. If the conductivity of any test points on the fitting is found to be less than 38.0% 

International Annealed Copper Standard (IACS), proceed to Part I. B. of this 

directive. 

3. If the conductivity of any test points on the fitting is found to be 38.0% IACS or 

greater, but not exceeding 45.0% IACS, proceed to Part I. C. of this directive. 

4. If the conductivity of any test points on the fitting is found to be greater than 

45.0% IACS, proceed to Part I. B. of this directive. 

Incorporation of previous revisions of Bombardier SB 84-54-14, prior to the effective 

date of this directive, meets the requirements of Part I. A of this directive. For the 

above aeroplanes that are within 100 hours air time of a repeat inspection interval, or 

are beyond 300 hours air time from the last DVI, conduct a DVI within 100 hours air 

time from the effective date of this directive.

B. Conductivity less than 38.0% IACS, or greater than 45.0% IACS: 

1. Conduct a daily repeat DVI of the nacelle attachment fitting, until Part I. B. 3. of 

this directive is completed, in accordance with the accomplishment instructions in 

section 3 of the Bombardier SB 84-54-14 Rev J dated 17 September 2010 or 

later revisions approved by the Chief, Continuing Airworthiness, Transport 

Canada. 

2. If any nacelle attachment fitting is found cracked, replace the cracked fitting in 

accordance with the accomplishment instructions in section 3. B. Part A. (3) of 

the Bombardier SB 84-54-14 Rev J dated 17 September 2010 or later revisions 

approved by the Chief, Continuing Airworthiness, Transport Canada, prior to next 

flight, and proceed to Part II of this directive. 

3. Replace the nacelle attachment fitting, in accordance with the accomplishment 

instructions in section 3. B. Part A. (3) of the Bombardier SB 84-54-14 Rev J

dated 17 September 2010 or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada, within 300 hours air time after the initial DVI 

carried out in Part I. A. of this directive and proceed to Part II of this directive. 

C. Conductivity 38.0% IACS or greater, but not exceeding 45.0% IACS: 

1. Conduct a DVI of the nacelle attachment fitting in accordance with the 

accomplishment instructions in section 3 of the Bombardier SB 84-54-14 Rev J

dated 17 September 2010 or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada, at intervals not to exceed 300 hours air time 

after the initial DVI carried out in Part I. A. of this directive. 

2. If any nacelle attachment fitting is found cracked, replace the cracked fitting in 

accordance with the accomplishment instructions in section 3. B. Part A. (3) of 

the Bombardier SB 84-54-14 Rev J dated 17 September 2010 or later revisions 

approved by the Chief, Continuing Airworthiness, Transport Canada, prior to next 

flight, and proceed to Part II of this directive. 

Part II - Applicable to Aircraft S/N 4305-4313, 4316 and subsequent and aircraft that 

have replaced nacelle attachment fi

A. Detailed Visual Inspection of new Nacelle Attachment Fitting Assembly Part 

Number (P/N) 85414663: 

Within 1200 hours air time from the date of the newly installed fitting, conduct a DVI 

of the nacelle attachment fitting, in accordance with the accomplishment instructions 
No.

 N° CF-2010-30R1 3/3 

ess, Transport

, Transport Canada, prior to next 

flight, and proceed to Part II. A. of this directive. 

Authorization: or Minister of Transport, Infrastructure and Communities 

Contact: 

13-996-9178 or e-mail CAWWEBFeedback@tc.gc.ca

in section 3 of the Bombardier Service Bulletin (SB) 84-54-14 Rev J dated 

17 September 2010, or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada. 

1. Subsequently, at intervals not to exceed 300 hours air time after the initial DVI 

carried out in Part II. A. of this directive, conduct a DVI of the nacelle attachment 

fitting, in accordance with the accomplishment instructions in section 3 of the 

Bombardier Service Bulletin (SB) 84-54-14 Rev J dated 17 September 2010, or 

later revisions approved by the Chief, Continuing Airworthin

Canada. 

2. If any nacelle attachment fitting is found cracked, replace the cracked fitting in 

accordance with the accomplishment instructions in section 3. B. Part A. (3) of 

the Bombardier SB 84-54-14 Rev J dated 17 September 2010, or later revisions 

approved by the Chief, Continuing Airworthiness

F

Derek Ferguson 

Chief, Continuing Airworthiness 

Mr. Robert Farinas, Continuing Airworthiness, Ottawa, telephone 613-952-4357, 

facsimile 6 or any Transport 

Canada Centre.