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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 na me. 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 Can ada, 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 Communicat ions 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-2010-16

Issue Date 18 May 2010

Number: CF-2010-16

Subject: Cockpit Windshield Lower Frames – Potential for Corrosion

Effective: 8 June 2010

Applicability: Bombardier Inc. Model DHC-8 Aeroplanes, as follows:

DHC-8 Series 100, 200, and 300, serial numbers 003 through 566; and DHC-8 Series 400, serial numbers 4001, 4003, 4004, 4006, 4008 through 4274

Compliance: Within 6,000 hours air time or 3 years after the effective date of this Directive, whichever comes first, unless already accomplished.

Note: The compliance times in this Directive differ from the recommended compliance

times mentioned in the Bombardi er Service Bulletins (SB).

Background: There have been several in-service reports of finding trapped water on the bottom of the cockpit windshield frames (or lower windshield frames) that resulted in either corrosion or water ingress into the cockpit. In one occurrence, the trapped water caused severe

corrosion of numerous anchor nuts that secure the windshield to the lower windshield frame, such that the intended fastening f unction was seriously compromised.

Corrosion of the lower windshield frames, including the anchor nuts that secure the windshield to the aircraft structure, can resu lt in a serious structural degradation possibly leading to the loss of the windshield during fligh t. Also, water could leak into the cockpit

and cause either a malfunction or failure of the electrical and electronics systems in the area of the cockpit instrument panels.

The lower windshield frames do not have drain provisions to prevent moisture or water

run-off from the condensation of the winds hields from being trapped. The consequences of trapped water in the lower windshield frames can result in unsafe conditions, as noted

above. This Directive mandates the installation of a dr ain system for the lower

windshield frames.

Corrective

Actions: Within the compliance times specified in the Compliance paragraph of this Directive, install a drain system in the cockpit windshield lower frames, as follows:

1. For Model DHC-8 Series 100, 200, and 300 aeroplanes, in accordance with Bombardier Service Bulletin 8-53-78, Revision C, dated 29 April 2010, or later revisions approved by the Chief, Continui ng Airworthiness, Transport Canada Civil Aviation. Compliance with this SB’s In itial Issue dated 23 December 1999, or Revision A dated 7 June 2001, or Revision B dated 2 May 2002, fulfills the requirement of this Directive and no additional action is required.No.

N ° CF-2010-16 2/2

2. For Model DHC-8 Series 400 aeroplanes, in accordance with Bombardier SB 84-53-43, Initial Issue, dated 27 April 2010, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada Civil Aviation.

Authorization: For Minister of Transport, In frastructure and Communities



### ORIGINAL SIGNED BY

Derek Ferguson Chief, Continuing Airworthiness

Contact: Mr. Anthony Wan, Continuing Airworthi ness, Ottawa, telephone 613-952-4357, facsimile

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