{"id":"F2006B05617","name":"AD/PA-28/60 - Carburettor Air Filter Box - Modification","slug":"ad-pa-28-60-carburettor-air-filter-box-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135255,"registerId":"commonwealth-F2006B05617-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/60 - Carburettor Air Filter Box - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Piper PA-28 Series Aeroplanes\n\n \n\nAD/PA-28/60 Carburettor Air Filter Box - Modification 3/77\n\nApplicability: Model PA-28-151 with S/Nos. 28-7415001 to 28-7715278 and 28-7715289. Document:               1. Piper SB No. 536; or\n\n2. FAA AD 77-01-03.\n\n \n\nCompliance: Within 100 hours time in service after 31 March 1977.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text sets a targeted mandatory modification for a defined set of airframes and a fixed compliance period and does not itself expand or narrow those criteria relative to the instrument as presented. The AD references external documents for technical detail but does not change applicability, timeframe, or obligation within this text (Applicability; Document; Compliance)."},"complexity_factors":["Narrow applicability: applies only to a specific model (PA-28-151) and tightly defined serial number ranges (Applicability).","Single, short compliance window: fixed deadline of 'within 100 hours time in service after 31 March 1977' simplifies scheduling but imposes time pressure (Compliance).","Dependence on external technical documents: required procedures are in Piper SB No. 536 or FAA AD 77-01-03 rather than in the AD text itself (Document).","Technical work required: modification of a carburettor air filter box requires qualified maintenance, parts and aircraft downtime (implied by nature of work and Document).","Limited procedural detail in the AD: enforcement, acceptance of alternatives, and administrative steps are left to the broader regulatory framework (header), increasing procedural reliance on external rules."],"plain_english_summary":"This AD mandates a modification to the carburettor air filter box on specified Piper PA-28-151 serial numbers, to be done per Piper Service Bulletin No. 536 or FAA AD 77‑01‑03. It must be completed within 100 hours TIS after 31 March 1977.\n\nIt applies to owners/operators of the listed aircraft under CASA authority; compliance is mandatory, at the owner/operator’s expense, to address the identified airworthiness/safety concern."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive targeting a specific known defect in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document — approximately 150 words of substantive content","Only one defined term implicitly used ('time in service')","No cross-references to other legislation beyond citing two external technical documents","Simple conditional structure: applicability defined by exact model and serial number ranges","Single compliance requirement with clear deadline formula","No nested exceptions or conditional logic"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it requires:** Owners and operators of certain Piper PA-28-151 Cherokee Warrior aeroplanes must modify the carburettor air filter box. A carburettor mixes air and fuel for the engine; the air filter box houses the filter that cleans incoming air. The modification addresses a safety defect in this component.\n\n**Who it affects:** Specifically applies to Piper PA-28-151 aircraft with serial numbers ranging from 28-7415001 to 28-7715278 and 28-7715289. These are particular Cherokee Warrior planes manufactured in the mid-1970s.\n\n**When it had to be done:** The work had to be completed within 100 hours of flying time after 31 March 1977. \"Time in service\" means actual hours the aircraft was operated, not just calendar time.\n\n**How to comply:** Follow either Piper Service Bulletin No. 536 or the equivalent US Federal Aviation Administration AD 77-01-03 — both documents provide the technical instructions for the modification.\n\n**Why it matters:** Airworthiness Directives are legally binding safety requirements. Non-compliance means the aircraft cannot legally fly. This particular AD prevents potential engine problems (likely air intake issues that could affect engine performance or cause failure) in these specific Piper aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-60-carburettor-air-filter-box-modification","history":"/api/acts/ad-pa-28-60-carburettor-air-filter-box-modification/history","analysis":"/api/acts/ad-pa-28-60-carburettor-air-filter-box-modification/analysis","conflicts":"/api/acts/ad-pa-28-60-carburettor-air-filter-box-modification/conflicts","importantCases":"/api/acts/ad-pa-28-60-carburettor-air-filter-box-modification/important-cases","documents":"/api/acts/ad-pa-28-60-carburettor-air-filter-box-modification/documents"}}