Bombardier (Boeing Canada/De Havilland)
Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes
Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes
| AD/DHC-8/46 Amdt 4 | Cockpit Door Alternate Release | 11/2005 |
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| Applicability: | DHC-8 aircraft Models 102, 103, 106, 201, 202, 301, 311, 314, and 315; equipped with cockpit door assembly, part numbers 82510074-( ), 82510294-( ),82510310-001, 8Z4597-001, H85250010-( ), 82510700-( ), or 82510704-( ); except 82510704-502 and 82510704-503.Note 1: -( ) denotes all dash numbers. |
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| Requirement: | 1. Action in accordance with Section III, Accomplishment Instructions, “Special Inspection/Repair”, of de Havilland Service Bulletin (SB) 8-52-39 Revision B, dated 4 July 1997, or a later Transport Canada approved revision.2. Install Modification 8/2337 in accordance with SB 8-52-39 Revision B, or a later Transport Canada approved revision.Note 2: Modifications 8/2228, 8/2229, 8/2231, 8/2232, 8Q100859, 8Q900267, 8Q420101, 8Q420143, 8Q200131, or 8Q420440, installed during production are equivalent to Modification 8/2337, with respect to the cockpit door alternate release mechanism, and meet the intent of Requirement 2.Note 3: Transport Canada AD CF-1996-20R4 refers. |
| Compliance: | 1. Before 31 October 1997. Inspect thereafter at intervals not to exceed 800 flight hours.2. Before 31 October 1997.The compliance times remain unchanged by this issue of the Directive. |
| This Amendment becomes effective on 27 October 2005. | |
| Background: | Investigation by the manufacturer of an in-flight incident of failure of the cockpit door alternate release mechanism has revealed a serious design deficiency. This Directive requires incorporation of a modification to correct the design deficiency.Amendment 1 extended the compliance time. An All Operator Message from the manufacturer gave further instructions to operators regarding a redesign of the door hinges because the existing modification was not satisfactory under all conditions. |
| Amendment 2 again extended the compliance due to further difficulty with the modification, and introduced a post mod repetitive inspection, which will deal with the shortcoming of the modification until such time as terminating action is determined.Amendment 3 amended applicability due to the installation of new reinforced cockpit doors.Amendment 4 is issued in response to a revision of the related Transport Canada AD, which amends applicability to exempt new reinforced cockpit doors that are not subject to the alternate release jamming issue. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
15 September 2005