Commonwealth legislation

AD/LA-4/19 - Anchor Light and Bilge Pump Wiring - Modification

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legislative instrument

Plain English Summary

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This airworthiness directive requires owners/operators of Colonial C‑1 and C‑2, Lake LA‑4, LA‑4P and LA‑4‑200 aeroplanes fitted with an anchor light or bilge pump to install a 5‑amp inline fuse in the power line within 10 cm of the battery relay, within 100 flight hours after 31 January 1980. The measure is intended to stop electrical shorts and cable burnings by protecting the unprotected length of cable between the battery relay and the existing switch; owners bear the installation cost and scheduling burden.

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Direct links to the current provisions in AD/LA-4/19 - Anchor Light and Bilge Pump Wiring - Modification.

AD/LA-4/19 - Anchor Light and Bilge Pump Wiring - Modification

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes

AD/LA-4/19 Anchor Light and Bilge Pump Wiring - Modification

12/79

Applicability: All Colonial C-1 and C-2, Lake LA-4, Lake LA-4P and Lake LA-4-200 with an Anchor light and/or Bilge Pump installed.

Requirement: Install a 5 amp inline fuse within 10 cm of the battery relay, in the power lines to the anchor light and bilge pump.

FAA AD 79-21-09 refers.

Compliance: Within 100 hours time in service after 31 January 1980.

Background: There have been reports from overseas of a burning of the electrical power cable for the bilge pump caused by an electrical short between the battery relay and the bilge pump switch. The fuse for the bilge pump circuit was located at the switch leaving a substantial length of cable between the battery relay and the fuse unprotected. The same type of circuit is used for the anchor light. Installation of a fuse at the battery relay should overcome this problem.

Source text

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

1 AD/LA-4/19 - Anchor Light and Bilge Pump Wiring - Modification