Commonwealth legislation

AD/DHC-8/96 - Brake Hydraulic System

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires specified modifications to the brake hydraulic system on Bombardier DHC-8 aeroplanes (serials 003–593). Mechanically, it mandates installing check valves in the No.1 and No.2 hydraulic return lines and modifying brake shuttle valves to remove filters and, later, an internal garter spring. It affects aircraft operators and maintenance organisations because those parties must carry out the work within the stated compliance periods to address an identified unsafe condition.

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/96 Brake Hydraulic System 4/200

AD/DHC-8/96 Brake Hydraulic System 4/2004

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

Serial Numbers 003 through 593.

Requirement: 1. Install check valves in the Number 1 and Number 2 hydraulic return systems by incorporating Modsum 8Q101320 in accordance with Bombardier Service Bulletin (SB) 8-29-36, Revision B, dated 6 January 2003.

2. Modify the brake shuttle valves, P/N 5084-1, to remove filter assemblies by incorporating either Modsum 8Q101316 or 8Q101422 in accordance with Bombardier SB 8-29-37, Revision A, dated 19 September 2003, and SB 8-29-39, Initial Issue, dated 14 July 2003.

3. Incorporate Modsum 8Q101316 to remove the internal garter spring from the brake shuttle valve in accordance with Bombardier SB 8-29-37, Revision A.

Note 1: Canadian AD CF-2004-02 refers.

Note 2: Modsum 8Q101320 is required as a prerequisite prior to the installation of one or more shuttle valves that has been modified per Modsum 8Q101316. It is permissible to have a mix of shuttle valves that incorporated either Modsum 8Q101316 or 8Q101422.

Compliance: For Requirements 1 and 2. Unless previously accomplished within 12 months after the effective date of this Directive.

For Requirement 3. Subsequent to the accomplishment of Requirements 1 and 2 of this directive, and prior to installation on an aircraft following overhaul of each brake shuttle valve, P/N 5084-1A, (i.e. brake shuttle valves with filters removed but internal garter spring not removed).

This Airworthiness Directive becomes effective on 15 April 2004.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE