{"id":"F2006B05922","name":"AD/PA-34/6 Amdt 2 - Exhaust System - Inspection","slug":"ad-pa-34-6-amdt-2-exhaust-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136007,"registerId":"commonwealth-F2006B05922-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-34/6 Amdt 2 - Exhaust System - Inspection","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-34 (Seneca) Series Aeroplanes\n\nAD/PA-34/6\n\nAmdt 2\n\n  \nExhaust System \\- Inspection 9/73\n\nApplicability: Model PA34-200 S/Nos. 34-E4, 34-7250001 and higher, fitted with exhaust stack assemblies P/N 96465-00 and 96466-00.\n\nRequirement: PART 1\n\nInspect the exhaust system for cracks or broken pipes in the vicinity of all welded areas and feel for any looseness of the pipes in the vicinity of mounting flanges.\n\nNote: The above inspection may be performed and certified by the pilot.\n\nPART 2\n\nCarry out inspection in accordance with Piper SB No. 373A or FAA AD 73-14-12. In addition remove the cabin air heater shroud and inspect the exhaust pipe for chafing marks made by the shroud. Also inspect cowls for chafing marks.\n\nCompliance: Part 1 \\- At each daily inspection.\n\nPart 2 \\- Within 10 hours time in service after 28 September 1973 and thereafter at intervals not exceeding 25 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 of an existing Airworthiness Directive, maintaining the original scope of exhaust system inspection requirements for specific Piper aircraft. The amendment appears to be a routine update without expansion beyond the original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined terms (Applicability, Requirement, Compliance, Note)","Simple two-part structure with clear sequential requirements","Single cross-reference to external technical documents (Piper SB 373A, FAA AD 73-14-12)","No nested exceptions or conditional logic","Clear compliance deadlines and intervals"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) for specific Piper PA-34 Seneca aircraft. It requires owners and operators to inspect the exhaust system for dangerous cracks, breaks, and wear.\n\n**Who it affects:**\n- Owners and operators of Piper PA-34-200 aircraft with specific serial numbers (34-E4, 34-7250001 and higher)\n- Only applies if the plane has exhaust stack assemblies with part numbers 96465-00 and 96466-00\n\n**What it requires:**\n\n**Part 1 (Simple check):**\n- Look for cracks or broken pipes near welded joints\n- Feel if pipes are loose near mounting flanges\n- Pilots can do and sign off on this themselves\n- Must be done at every daily inspection\n\n**Part 2 (Detailed check):**\n- Follow Piper Service Bulletin 373A or FAA Airworthiness Directive 73-14-12\n- Remove the cabin heater cover and check for rubbing/chafing damage on exhaust pipes\n- Check engine cowls for similar rubbing marks\n- First due within 10 flight hours after 28 September 1973\n- Then repeat every 25 flight hours\n\n**Why it matters:**\nExhaust system failures can leak deadly carbon monoxide into the cabin or cause engine fires. This directive prevents accidents by catching cracks and wear before they become dangerous."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This is Amendment 2 of the AD and it sets out a two-part inspection regime where Part 1 is a pilot-performed daily inspection and Part 2 is a detailed inspection referencing Piper SB No. 373A or FAA AD 73-14-12 and adding specific steps (removal of the cabin air heater shroud and inspection for chafing on the exhaust pipe and cowls). The amendment therefore adds or formalises the additional Part 2 requirements and the specific compliance intervals (initial within 10 hours after 28 September 1973 and then every 25 hours), while retaining the daily pilot inspection (Requirement: PART 1; Requirement: PART 2; Compliance; Note)."},"complexity_factors":["Two-part structure (simple daily pilot-check plus a separate detailed inspection) increases procedural steps (Requirement: PART 1; Requirement: PART 2)","Specific applicability by model, serial number range and exhaust part numbers narrows scope but requires cross-checking aircraft records (Applicability)","References external documents (Piper SB No. 373A and FAA AD 73-14-12) for the detailed inspection procedure, creating dependence on other texts (Requirement: PART 2)","Different compliance intervals (daily for Part 1; initial within 10 hours after a date, then every 25 hours for Part 2) require scheduling coordination (Compliance)","Pilot certification allowed for Part 1 creates a mix of operator-level and document-specified procedural obligations (Note)"],"plain_english_summary":"This directive requires recurring inspections of the exhaust system on specified Piper PA‑34‑200 (Seneca) aeroplanes with certain serial and exhaust part numbers: a pilot‑performable daily check for cracks, looseness and broken welds, and a deeper inspection (removing the cabin air heater shroud to check for chafing and cowling damage) to be done per Piper SB No. 373A/FAA AD 73‑14‑12.\n\nIt affects owners/operators who must add these checks to routines, bear associated time and repair costs, and follow the initial 10‑hour then 25‑hour inspection cadence."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-34-6-amdt-2-exhaust-system-inspection","history":"/api/acts/ad-pa-34-6-amdt-2-exhaust-system-inspection/history","analysis":"/api/acts/ad-pa-34-6-amdt-2-exhaust-system-inspection/analysis","conflicts":"/api/acts/ad-pa-34-6-amdt-2-exhaust-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-34-6-amdt-2-exhaust-system-inspection/important-cases","documents":"/api/acts/ad-pa-34-6-amdt-2-exhaust-system-inspection/documents"}}