{"id":"F2006B11107","name":"AD/LEARJET 35/28 - Crew Oxygen Plumbing and Map Light Wire Protection","slug":"ad-learjet-35-28-crew-oxygen-plumbing-and-map-light-wire-protection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56767,"registerId":"commonwealth-F2006B11107-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET 35/28 - Crew Oxygen Plumbing and Map Light Wire Protection","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)  \nGates Learjet 35 and 36 Series Aeroplanes\n\nAD/LEARJET 35/28 Crew Oxygen Plumbing and Map\n\nLight Wire Protection\n\n  \n2/93\n\nApplicability: All Learjet 35 and 36 series airplanes with serial numbers 35-001 to 35-661 inclusive and 36-001 to 36-063 inclusive.\n\nRequirement: Modify the cockpit map light wiring in accordance with Learjet Airplane Modification Kit AMK 90-5 dated 11 October 1991.\n\nNote: FAA AD 92-19-12 Amendment 39-8370 refers.\n\nCompliance: Prior to further flight after 4 July 1993.\n\nBackground: The FAA has received a report of an in-flight fire on a Learjet Model 24 series airplane caused by chafing of the cockpit map light wires. The electrical arcing against the oxygen mask tubing caused burn-through and the subsequent fire.\n\nCompliance with this Directive decreases the likelihood of an in-flight fire caused by map light wire chafing.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of preventing in-flight fires caused by wire chafing in Learjet 35/36 series aircraft."},"complexity_factors":["Single, specific technical requirement (install one modification kit)","Narrow applicability (two specific aircraft series with defined serial number ranges)","No nested exceptions or conditional logic","Only one defined term implicitly referenced (the modification kit, which is explicitly identified by document number and date)","Clear, absolute compliance deadline","Short document (approximately 150 words excluding header)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Learjet 35 and 36 series aircraft to fix a dangerous wiring problem.\n\n**What the problem is:**\nThe cockpit map light wires can rub against (\"chafe\") nearby oxygen mask tubing. This friction can wear through the wire insulation, causing electrical sparks (arcing) that can ignite the oxygen tubing and start an in-flight fire. The FAA already investigated one such fire on a similar aircraft.\n\n**Who must comply:**\nAnyone operating Learjet 35 or 36 series planes with serial numbers 35-001 through 35-661, or 36-001 through 36-063.\n\n**What must be done:**\nInstall a specific modification kit (Learjet AMK 90-5, dated 11 October 1991) to protect the map light wiring. This kit presumably reroutes or shields the wires to prevent contact with oxygen lines.\n\n**When it must be done:**\nBefore the aircraft flies again after 4 July 1993.\n\n**Why it matters:**\nIn-flight fires are catastrophic. This directive prevents a known hazard that has already caused at least one fire in a similar aircraft type."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is narrowly focused on preventing wiring chafe-related fires in specified Learjet 35 and 36 serial-numbered aeroplanes by mandating a single wiring modification (Applicability; Requirement). The document does not expand or narrow that technical scope compared with its stated purpose in the Background and does not introduce additional regulatory areas or obligations."},"complexity_factors":["Narrow, specific applicability by serial number (Applicability)","Single prescriptive technical requirement referencing a dated modification kit (Requirement)","Clear compliance deadline that grounds aircraft until done (Compliance)","Reference to an external FAA AD for background context (Note)","No multiple compliance pathways, exemptions, or complex procedural rules described (Requirement; Compliance)"],"plain_english_summary":"This directive requires owners/operators of specific Learjet 35 and 36 serials (35‑001 to 35‑661; 36‑001 to 36‑063) to install Learjet Airplane Modification Kit AMK 90‑5 (cockpit map light wiring) before any flight after 4 July 1993. It responds to a documented in‑flight fire risk from chafing wiring; compliance restores legal airworthiness and imposes direct parts, labour and downtime costs on operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-28-crew-oxygen-plumbing-and-map-light-wire-protection","history":"/api/acts/ad-learjet-35-28-crew-oxygen-plumbing-and-map-light-wire-protection/history","analysis":"/api/acts/ad-learjet-35-28-crew-oxygen-plumbing-and-map-light-wire-protection/analysis","conflicts":"/api/acts/ad-learjet-35-28-crew-oxygen-plumbing-and-map-light-wire-protection/conflicts","importantCases":"/api/acts/ad-learjet-35-28-crew-oxygen-plumbing-and-map-light-wire-protection/important-cases","documents":"/api/acts/ad-learjet-35-28-crew-oxygen-plumbing-and-map-light-wire-protection/documents"}}