{"id":"F2006B05434","name":"AD/PA-22/3 Amdt 2 - Fuel Primer and Hydraulic Lines - Re-Routing","slug":"ad-pa-22-3-amdt-2-fuel-primer-and-hydraulic-lines-re-routing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46141,"registerId":"commonwealth-F2006B05434-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-22/3 Amdt 2 - Fuel Primer and Hydraulic Lines - Re-Routing","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-22 (Tri-Pacer and Colt) Series Aeroplanes\n\nAD/PA-22/3\n\nAmdt 2\n\n  \nFuel Primer and Hydraulic Lines \\- Re-Routing 4/85 DM\n\nApplicability: All models.\n\nRequirement: 1. To prevent contact with the exhaust muffler, re-route fuel primer line, and wheel brake hydraulic line if necessary, to ensure that they do not pass behind the muffler.\n\n2. Using clamps, secure the lines to the firewall \\- refer to Piper SL No. 213 for fuel primer line clamping instructions.\n\nNote: FAA AD 53-24-4 refers.\n\nCompliance: Within 25 hours time in service after 31 March 1985.\n\nBackground: This Directive has been amended to combine the intent of Piper SL No. 213 and FAA AD 53-24-4 into a single requirement. Re-routing, as applicable, of the fuel primer line and wheel brake hydraulic line is necessary to preclude the possibility of an in- flight fire.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment consolidates two existing safety requirements into one directive but does not expand the scope beyond the original safety purpose of preventing in-flight fires due to fuel/hydraulic line contact with exhaust components."},"complexity_factors":["Very short document (under 300 words)","Only 2 substantive requirements with clear mechanical actions","Single applicability clause ('All models')","No defined terms section","No cross-references to other legislation beyond a single FAA AD reference and manufacturer service letter","Simple temporal compliance condition (25 hours after fixed date)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) for owners and operators of **Piper PA-22 Tri-Pacer and Colt aircraft**.\n\n**What it does:**\n- Requires aircraft owners to **re-route two specific lines** — the fuel primer line and the wheel brake hydraulic line — so they don't pass behind the exhaust muffler.\n- Requires these lines to be **clamped to the firewall** using specific instructions from the manufacturer (Piper Service Letter No. 213).\n\n**Why it matters:**\nIf these fuel and hydraulic lines touch or run too close to the hot exhaust muffler, they can overheat, leak, or ignite — causing an **in-flight fire**. This directive prevents that catastrophic failure.\n\n**Who must comply:**\n- All owners/operators of Piper PA-22 series aircraft (all models).\n- The work had to be done within **25 flight hours after 31 March 1985**.\n\n**Key point:** This is Amendment 2, which combines two earlier safety notices (one from the manufacturer, one from the US FAA) into a single, clearer Australian requirement."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The Directive has been amended to combine the intent of Piper Service Letter No. 213 and FAA AD 53-24-4 into a single requirement, consolidating the manufacturer's clamping guidance and the FAA's earlier directive into one enforceable action (Background; Note)."},"complexity_factors":["Single, narrowly focused technical requirement (re-route lines and clamp to firewall).","Applicability to all models of a single aircraft series simplifies scope (Applicability).","Short, fixed compliance timeframe creates scheduling pressure (Compliance).","Dependency on external manufacturer's document (Piper SL No. 213) for specific clamping instructions (Requirement 2).","Reference to an external FAA AD introduces cross-jurisdictional provenance but does not add procedural steps (Note).","Implementation technical risk depends on maintenance skill and correct execution (Requirement 1–2; Background)."],"plain_english_summary":"This Directive requires owners/operators of all Piper PA-22 (Tri‑Pacer and Colt) aircraft to re‑route the fuel primer—and if needed the wheel‑brake hydraulic—lines so they do not pass behind the exhaust muffler, and to clamp them to the firewall per Piper Service Letter No. 213. It must be done within 25 hours TIS to reduce the risk of heat/contact damage and possible in‑flight fire."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-3-amdt-2-fuel-primer-and-hydraulic-lines-re-routing","history":"/api/acts/ad-pa-22-3-amdt-2-fuel-primer-and-hydraulic-lines-re-routing/history","analysis":"/api/acts/ad-pa-22-3-amdt-2-fuel-primer-and-hydraulic-lines-re-routing/analysis","conflicts":"/api/acts/ad-pa-22-3-amdt-2-fuel-primer-and-hydraulic-lines-re-routing/conflicts","importantCases":"/api/acts/ad-pa-22-3-amdt-2-fuel-primer-and-hydraulic-lines-re-routing/important-cases","documents":"/api/acts/ad-pa-22-3-amdt-2-fuel-primer-and-hydraulic-lines-re-routing/documents"}}