Commonwealth legislation

AD/DHC-8/31 - Firewall Electrical Terminal Block

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires owners/operators of specified De Havilland/Bombardier DHC‑8 aeroplanes (models 102, 103, 106, 301, 311, 314; serials 003–362) to install de Havilland Modification 8/1984 by following Bombardier Service Bulletin S.B.8‑24‑47 Revision A to eliminate aluminium washers in firewall DC terminal blocks and battery shunt assemblies (Requirement; Background). The stated aim is to prevent corrosion that can cause loose or high‑resistance electrical connections; operators must comply by 23 April 1994, bearing the costs and possible downtime (Compliance; Note).

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AD/DHC-8/31 - Firewall Electrical Terminal Block

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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

AD/DHC-8/31 Firewall Electrical Terminal Block 4/94

Applicability: DHC-8 aircraft, models 102, 103, 106, 301, 311 and 314, serial numbers 003 through

362 inclusive.

Requirement: Incorporate de Havilland Modification 8/1984 in accordance with Bombardier Regional Aircraft Division de Havilland Dash 8 Service Bulletin S.B.8-24-47 Revision A dated 29 November 1993.

Note: Transport Canada AD CF-93-31 dated 17 December 1993 refers.

Compliance: Prior to 23 April 1994.

Background: Results from a de Havilland investigation show that the use of aluminium washers in the DC firewall terminal block and battery shunt cable assemblies can cause corrosion at the electrical connections. This can result in either a loose connection or generate a high electrical resistance at the connection point. Compliance with this Directive is designed to prevent the corrosion occurring. Compliance required by Transport Canada is extended by 30 days.

Source text

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

1 AD/DHC-8/31 - Firewall Electrical Terminal Block