{"id":"F2006B05791","name":"AD/PA-31/85 - Cigar Lighters - Disconnection","slug":"ad-pa-31-85-cigar-lighters-disconnection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135690,"registerId":"commonwealth-F2006B05791-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/85 - Cigar Lighters - Disconnection","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)  \nPiper PA-31 Series Aeroplanes\n\nAD/PA-31/85 Cigar Lighters \\- Disconnection 11/79\n\nApplicability: All models PA-31 and PA-31-325 with S/Nos. 31-7712074 to 31-7912098 and PA- 31-350 with S/Nos. 31-7752096 to 31-7952197 equipped with three 12 Volt cigar lighters powered through a triplet of voltage dropping resistors.\n\nRequirement: 1. For models PA-31 and PA-31-325 S/Nos 31-7712074 to 31-7912000, and PA-31- 350 S/Nos. 31-7752096 to 31-7952000; disconnect wire CIG-1 from the 7 amp circuit breaker located at the voltage dropping resistor assembly under the instrument panel or disconnect wire CIG-1A from the 15 Amp “Heater and Cigar Lighter” circuit breaker located on the pilot’s circuit breaker panel.\n\n2. For models PA-31 and PA-31-325 S/Nos. 31-7912001 to 31-7912098 and PA-31-\n\n350 S/Nos. 31-7952001 to 31-7952197 except 31-7952191, 31-7952193, 31-\n\n7952195; disconnect wire CIG-1 from the 7 Amp “Lighter” circuit breaker located on the pilot’s circuit breaker panel.\n\n3. After disconnection, protect the wire by insulating its disconnected end and fold the wire end back against itself or the bundle in which it is routed and secure it.\n\nNote: FAA AD 79-20-07 Amdt. 39-3573 refers.\n\nCompliance: Within the next 100 hours time in service after 30 November 1979.\n\nBackground: During flight voltage dropping resistors have been burning and causing smoke in the cockpit.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific fire hazard in specific aircraft. It has not expanded beyond its original purpose of preventing in-flight fires caused by cigar lighter voltage dropping resistors."},"complexity_factors":["Multiple serial number ranges with different technical requirements (two distinct groups with different wire disconnection procedures)","Specific wire identifiers (CIG-1, CIG-1A) and circuit breaker specifications (7 amp vs 15 amp, different locations)","Exception within exception: third serial number group excludes specific individual serial numbers (31-7952191, 31-7952193, 31-7952195)","Technical aviation terminology (time in service, voltage dropping resistors, circuit breaker panels)","Cross-reference to US FAA directive (FAA AD 79-20-07)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of certain Piper PA-31 series aeroplanes to disconnect and insulate the cockpit cigar-lighter wiring because the voltage-dropping resistors have been catching fire and producing cockpit smoke. It applies only to specified serial-numbered aircraft with three 12‑volt cigar lighters and must be complied with within 100 flight hours after 30 November 1979 to eliminate the in‑flight fire/smoke hazard."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope remains focused on specified PA‑31 serial ranges and the single corrective action of disconnecting cigar lighter feed wires to mitigate resistor burning and smoke. The instrument does not expand to other systems or airframes and does not alter the required corrective measure or compliance deadline."},"complexity_factors":["Applicability defined by multiple overlapping serial‑number ranges and model variants (Applicability section)","Different disconnection actions depending on serial‑number subgroup and wiring location (Requirement paragraphs 1–2)","Physical access and skill needed to locate wires under instrument panel or on pilot circuit breaker panel (Requirement 1–2)","Requirement to insulate and secure disconnected wire ends to prevent chafing/electrical hazards (Requirement 3)","Short compliance window tied to flight hours (100 hours from 30 November 1979) creating scheduling pressure (Compliance)","Operational consequence of disabling cigar lighters (loss of functionality borne by operators)","Cross‑reference to FAA AD introduces an external regulatory linkage (Note)","Safety rationale based on in‑flight resistor burning and cockpit smoke, implying an urgent risk mitigation priority (Background)"],"plain_english_summary":"This airworthiness directive requires owners/operators of specified Piper PA‑31 series aeroplanes to disconnect the electrical feed to cockpit cigar lighters and to insulate and secure the disconnected wire ends. It applies to aircraft in specific serial‑number ranges fitted with three 12‑volt cigar lighters powered through voltage‑dropping resistors. The action is intended to remove a source of resistor burning and cockpit smoke; compliance (within 100 hours) creates a maintenance cost, loss of lighter function and a short inspection/repair task for operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-85-cigar-lighters-disconnection","history":"/api/acts/ad-pa-31-85-cigar-lighters-disconnection/history","analysis":"/api/acts/ad-pa-31-85-cigar-lighters-disconnection/analysis","conflicts":"/api/acts/ad-pa-31-85-cigar-lighters-disconnection/conflicts","importantCases":"/api/acts/ad-pa-31-85-cigar-lighters-disconnection/important-cases","documents":"/api/acts/ad-pa-31-85-cigar-lighters-disconnection/documents"}}