{"id":"F2008L03271","name":"AD/PA-22/15 Amdt 1 - Brake Master Cylinder Diaphragm - Replacement - CANCELLED","slug":"ad-pa-22-15-amdt-1-brake-master-cylinder-diaphragm-replacement-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75388,"registerId":"commonwealth-F2008L03271-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-22 (Tri-Pacer and Colt) Series ","sectionType":"division","heading":"Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes","content":"### Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes\n\n| AD/PA-22/15 Amdt 1 | Brake Master CylinderDiaphragm - Replacement | 10/2008 |\n| ------------------ | -------------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                           |\n| ------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 25 September 2008.                                                                                                                                                                                                           |\n| Background:  | This unique Australian AD specified replacement of brake master cylinder diaphragms at intervals not exceeding 200 hours. This AD was not based on a Piper service instruction. This maintenance task no longer warrants an Airworthiness Directive. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n11 August 2008","sortOrder":0},{"sectionNumber":"AD/PA-22/15 Amdt 1","sectionType":"part","heading":"AD/PA-22/15 Amdt 1","content":"## AD/PA-22/15 Amdt 1","sortOrder":1},{"sectionNumber":"Brake Master CylinderDiaphragm - Replace","sectionType":"part","heading":"Brake Master CylinderDiaphragm - Replacement","content":"## Brake Master Cylinder  \nDiaphragm - Replacement","sortOrder":2},{"sectionNumber":"10/2008","sectionType":"part","heading":"10/2008","content":"## 10/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1462},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument terminates the regulatory requirement entirely rather than expanding the scope of the legislation. The original AD imposed a maintenance obligation; this amendment abolishes it completely effective 25 September 2008."},"complexity_factors":["Single operative provision (cancellation of previous instrument)","No definitions section or interpretative clauses","No conditional logic or exceptions","Minimal cross-referencing (only to the previous AD number being cancelled)","Extremely short (under 200 words of substantive content)"],"plain_english_summary":"**What this does:**\nThis document officially cancels a previous aviation safety rule (Airworthiness Directive AD/PA-22/15) that required owners of specific Piper aircraft to replace brake master cylinder diaphragms every 200 flight hours.\n\n**Who it affects:**\nOwners and operators of **Piper PA-22 (Tri-Pacer and Colt) series aeroplanes**.\n\n**What changed:**\n- **Before:** You legally had to replace these brake diaphragms every 200 hours of flying time.\n- **Now:** That requirement is scrapped (cancelled effective 25 September 2008).\n\n**Why it matters:**\nCASA (the aviation safety regulator) decided this particular maintenance task wasn't actually necessary to keep these planes safe. This saves owners the hassle and expense of doing this specific brake work every 200 hours. The original rule wasn't even based on the manufacturer's instructions—it was unique to Australia—so they've ditched it.\n\n**In short:** One less paperwork headache and maintenance bill for Tri-Pacer and Colt owners."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-15-amdt-1-brake-master-cylinder-diaphragm-replacement-cancelled","history":"/api/acts/ad-pa-22-15-amdt-1-brake-master-cylinder-diaphragm-replacement-cancelled/history","analysis":"/api/acts/ad-pa-22-15-amdt-1-brake-master-cylinder-diaphragm-replacement-cancelled/analysis","conflicts":"/api/acts/ad-pa-22-15-amdt-1-brake-master-cylinder-diaphragm-replacement-cancelled/conflicts","importantCases":"/api/acts/ad-pa-22-15-amdt-1-brake-master-cylinder-diaphragm-replacement-cancelled/important-cases","documents":"/api/acts/ad-pa-22-15-amdt-1-brake-master-cylinder-diaphragm-replacement-cancelled/documents"}}