{"id":"F2006B11069","name":"AD/LA-4/19 - Anchor Light and Bilge Pump Wiring - Modification","slug":"ad-la-4-19-anchor-light-and-bilge-pump-wiring-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56704,"registerId":"commonwealth-F2006B11069-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/19 - Anchor Light and Bilge Pump Wiring - Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nConsolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\nAD/LA-4/19 Anchor Light and Bilge Pump Wiring - Modification\n\n  \n12/79\n\nApplicability: 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.\n\nRequirement: Install a 5 amp inline fuse within 10 cm of the battery relay, in the power lines to the anchor light and bilge pump.\n\nFAA AD 79-21-09 refers.\n\nCompliance: Within 100 hours time in service after 31 January 1980.\n\nBackground: 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.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope is limited to the listed aircraft fitted with an anchor light and/or bilge pump and prescribes a single corrective modification. The directive aligns with and references the FAA AD (FAA AD 79‑21‑09) and does not extend obligations beyond those aircraft or the single installation task."},"complexity_factors":["Technical simplicity: single 5 amp inline fuse installation (Requirement).","Precise placement requirement: fuse must be installed within 10 cm of the battery relay (Requirement).","Narrow applicability: applies only to specified Colonial and Lake LA‑4 models with an anchor light and/or bilge pump installed (Applicability).","Fixed compliance window: action required within 100 hours time in service after 31 January 1980 (Compliance).","Safety-driven background: response to reported cable burning from electrical shorts between relay and switch (Background).","External coordination: references FAA AD 79‑21‑09, indicating alignment with a foreign AD (Requirement)."],"plain_english_summary":"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."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific wiring hazard in specific aircraft models. It has not expanded beyond its original purpose of preventing electrical fires in bilge pump and anchor light circuits."},"complexity_factors":["Single, specific technical requirement (install one fuse)","No defined terms section","No cross-references to other legislation (only references FAA AD 79-21-09 for context)","Clear applicability section listing specific aircraft models","Simple conditional logic (if you have this equipment, you must do this)","Single compliance deadline with straightforward calculation (100 hours time in service after fixed date)","Total length is approximately 150 words"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific small seaplanes made by Consolidated Aeronautics and Lake Aircraft.\n\n**What it does:**\nRequires owners and operators to install a **5 amp fuse** very close to the battery relay (within 10 cm) on the power lines running to two specific pieces of equipment:\n- The **anchor light** (a navigation light used when the plane is anchored on water)\n- The **bilge pump** (a pump that removes water from the hull)\n\n**Why it matters:**\nThere had been reports of electrical fires overseas. The problem was that the existing fuse was located at the switch, leaving a long stretch of wire between the battery and the fuse unprotected. If that wire short-circuited, it could overheat and burn. Moving the fuse closer to the battery relay protects the entire length of the wiring.\n\n**Who must comply:**\nAnyone operating these specific aircraft models with anchor lights and/or bilge pumps installed:\n- Colonial C-1 and C-2\n- Lake LA-4, LA-4P, and LA-4-200\n\n**Deadline:**\nThe modification must be done within 100 hours of flight time after 31 January 1980.\n\n**Key point:** This is a **retrospective safety fix** — it applies to planes already in service, not just new ones."}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-19-anchor-light-and-bilge-pump-wiring-modification","history":"/api/acts/ad-la-4-19-anchor-light-and-bilge-pump-wiring-modification/history","analysis":"/api/acts/ad-la-4-19-anchor-light-and-bilge-pump-wiring-modification/analysis","conflicts":"/api/acts/ad-la-4-19-anchor-light-and-bilge-pump-wiring-modification/conflicts","importantCases":"/api/acts/ad-la-4-19-anchor-light-and-bilge-pump-wiring-modification/important-cases","documents":"/api/acts/ad-la-4-19-anchor-light-and-bilge-pump-wiring-modification/documents"}}