{"id":"F2008L04113","name":"AD/PA-24/14 Amdt 2 - Exhaust System - Inspection","slug":"ad-pa-24-14-amdt-2-exhaust-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76024,"registerId":"commonwealth-F2008L04113-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-24 (Comanche) Series Aeroplanes","sectionType":"division","heading":"Piper PA-24 (Comanche) Series Aeroplanes","content":"### Piper PA-24 (Comanche) Series Aeroplanes\n\n| AD/PA-24/14 Amdt 2 | Exhaust System - Inspection | 12/2008 |\n| ------------------ | --------------------------- | ------- |\n\n| Applicability: | Models PA-24, PA-24-250 and PA-24-260 except PA-24-260 with serial numbers24-4783, 24-4804 and subsequent.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Inspect the engine exhaust muffler and shroud assembly (including the internal baffle tube and tail pipe), carburettor heat shroud and air duct, support braces, clamps and brackets, exhaust stacks and manifolds in accordance with USA AD 68-05-01.This repetitive inspection may be discontinued when:For PA-24 aircraft, hollow muffler P/N 24506 or P/N 26385 is installed.For PA-24-250 aircraft, hollow muffler P/N 24506 or P/N 26385 is installed in combination with muffler support Kit No. 756775 or Kit No. 757058.For PA-24-260 aircraft, a barrier device is installed in each muffler in accordance with Piper Service Letter No. 518.Note: Piper Service Letters 324B, 324C, 412A, 481 and 518 are relevant. |\n| Compliance:    | At each scheduled inspection for issue of a maintenance release following the date of effectivity of this Amendment.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Amendment becomes effective on 20 November 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Background:    | The original issue of this AD in 1963 specified compliance with Piper Service Letter No. 324B which covered models PA-24 and PA-24-250.Amendment 1 in 1969 specified compliance with Piper Service Letter No. 324C which also covered models PA-24-260 and PA-24-400.                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n\n|     | This Amendment specifies compliance with USA AD 68-05-01 which excludesPA-24-400 and certain examples of PA-24-260; and allows discontinuation of repetitive inspections in some circumstances. The compliance period has been changed from each 100 hours to each maintenance release inspection. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n10 October 2008","sortOrder":0},{"sectionNumber":"AD/PA-24/14 Amdt 2","sectionType":"part","heading":"AD/PA-24/14 Amdt 2","content":"## AD/PA-24/14 Amdt 2","sortOrder":1},{"sectionNumber":"Exhaust System - Inspection","sectionType":"part","heading":"Exhaust System - Inspection","content":"## Exhaust System - Inspection","sortOrder":2},{"sectionNumber":"12/2008","sectionType":"part","heading":"12/2008","content":"## 12/2008","sortOrder":3}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment narrows and refines scope compared with earlier issues: it adopts USA AD 68-05-01 (excluding PA-24-400 and certain PA-24-260 examples), permits discontinuation of repetitive inspections when specified mufflers, support kits or barrier devices are installed, and changes the inspection interval from each 100 hours to each maintenance-release inspection (Requirement; Background; Compliance)."},"complexity_factors":["Cross-reference to an external United States AD (USA AD 68-05-01) requiring implementers to consult another jurisdictional document (Requirement; Background).","Multiple model applicability and explicit serial-number exceptions for PA-24-260, requiring operators to check individual aircraft identity (Applicability).","Conditional discontinuation of repetitive inspections dependent on fitting specific parts or kits (muffler P/Ns, muffler support Kit Nos., or barrier device) which creates a compliance-by-modification pathway (Requirement).","References to several Piper Service Letters (324B, 324C, 412A, 481 and 518) that operators must consult to meet the AD (Requirement).","Change of compliance metric from a fixed flight-hour interval (100 hours) to inspection at each maintenance-release, altering operator scheduling and record-keeping practices (Background; Compliance).","Enforcement and effective-date administrative detail (effective 20 November 2008) that frames when operators must have adjusted procedures (Compliance)."],"plain_english_summary":"This amendment requires owners/operators of Piper PA-24, PA-24-250 and most PA-24-260 aeroplanes to inspect the engine exhaust muffler and shroud assembly, carburettor heat shroud and ducting, supports, clamps, brackets, exhaust stacks and manifolds at each scheduled maintenance-release (Requirement; Compliance). Repetitive inspections may be stopped when specified hollow mufflers, support kits or barrier devices are fitted; the amendment also aligns with USA AD 68-05-01 and replaces the previous 100-hour interval with inspection at each maintenance release (Requirement; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original 1963 AD applied to PA-24 and PA-24-250 models only. Amendment 1 (1969) expanded scope to include PA-24-260 and PA-24-400. This Amendment 2 (2008) narrows scope by excluding PA-24-400 and certain PA-24-260 serial numbers, while also changing the compliance interval from rigid 100-hour intervals to maintenance release inspections (typically annual or 100-hour, but more flexible). The termination conditions allowing discontinuation of inspections are also new, effectively reducing ongoing burden for compliant owners."},"complexity_factors":["Short, single-purpose document (1 page)","Only 3 defined aircraft models with specific serial number exemptions","Single primary requirement with 3 alternative termination conditions","References external documents (USA AD 68-05-01 and Piper Service Letters) without reproducing their content","Simple compliance trigger (maintenance release inspection)","No nested conditional logic or cross-references to other legislation"],"plain_english_summary":"This AD mandates regular inspections of the engine exhaust system on Piper Comanche (PA-24, PA-24-250, most PA-24-260) to detect cracks, corrosion or failures that can cause cabin carbon monoxide leaks or engine fires. It affects owners, operators and certifying mechanics; a few PA-24-260 serials are exempt.\n\nAmendment 2 moves checks from every 100 flight hours to at each scheduled maintenance release, and allows terminating repetitive inspections by installing specified replacement parts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-24-14-amdt-2-exhaust-system-inspection","history":"/api/acts/ad-pa-24-14-amdt-2-exhaust-system-inspection/history","analysis":"/api/acts/ad-pa-24-14-amdt-2-exhaust-system-inspection/analysis","conflicts":"/api/acts/ad-pa-24-14-amdt-2-exhaust-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-24-14-amdt-2-exhaust-system-inspection/important-cases","documents":"/api/acts/ad-pa-24-14-amdt-2-exhaust-system-inspection/documents"}}