{"id":"F2006B05058","name":"AD/CESSNA 180/45 - Induction Air Box Seal","slug":"ad-cessna-180-45-induction-air-box-seal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44968,"registerId":"commonwealth-F2006B05058-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/45 - Induction Air Box Seal","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)  Cessna 180, 182 and Wren 460 Series Aeroplanes\n\n \n\nAD/CESSNA 180/45 Induction Air Box Seal 6/77\n\nApplicability: Model 180 with S/Nos. 18050662 to 18052711. Model 182 and Wren 460 with\n\nS/Nos. 18251557 to 18264790.\n\n \n\nRequirement: Action in accordance with Cessna SL No. SE76-18.\n\n \n\nNote: FAA AD 77-04-05 Amendment 39-2838 refers.\n\n \n\nCompliance: Within 100 hours time in service after 30 June 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive from 1977 addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection/replacement of induction air box seals in the identified Cessna and Wren aircraft models."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only 3 defined applicability criteria (specific aircraft models and serial number ranges)","Single requirement referencing an external document (Cessna Service Letter SE76-18)","Simple compliance deadline (100 hours time in service after fixed date)","No nested conditions, exceptions, or cross-references to other legislation beyond one note referencing FAA AD","No interpretation section or defined terms"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice for aircraft, but with legal force.\n\n**What it does:** It requires owners and operators of specific Cessna aeroplanes to inspect and fix a problem with the **induction air box seal** — a rubber or foam seal that sits where the engine breathes in air. If this seal fails, the engine can suck in unfiltered air (dust, debris), causing serious internal damage or engine failure.\n\n**Who it affects:**\n- **Cessna Model 180** aeroplanes with serial numbers 18050662 to 18052711\n- **Cessna Model 182** aeroplanes with serial numbers 18251557 to 18264790  \n- **Wren 460** aeroplanes with the same serial number range as the 182\n\n**What must be done:** Operators must follow the instructions in **Cessna Service Letter No. SE76-18** (a technical bulletin from the manufacturer). The Australian directive references an equivalent American safety order (FAA AD 77-04-05) for additional context.\n\n**When it had to be done:** Within **100 hours of flying time** after 30 June 1977. (This deadline has long passed — any affected aircraft still flying should have complied decades ago.)\n\n**Why it matters:** Engine induction leaks can cause catastrophic engine failure in flight. This directive prevents that by ensuring the air intake system is properly sealed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text sets a specific applicability, references the manufacturer’s service letter for required work, and fixes a compliance window. The instrument itself does not state any modification to an earlier scope or intent, and no information in the provided text indicates a change from an original intent."},"complexity_factors":["Narrow, precisely enumerated applicability by model and serial-number ranges (Applicability)","Requirement delegates technical detail to an external manufacturer document (Cessna SL No. SE76-18), requiring cross-reference (Requirement)","Fixed compliance window tied to a historical date and measured in flight hours (Compliance)","Short text with limited procedural detail reduces internal complexity but increases dependence on the external service letter (Requirement)","Cross-reference to an FAA AD adds an additional external document to consider (Note)"],"plain_english_summary":"This airworthiness directive mandates owners/operators of specific Cessna 180, Cessna 182 and Wren 460 aeroplanes (listed by serial-number ranges) to carry out the induction air box seal work specified in Cessna Service Letter SE76-18. \n\nThe work must be completed within 100 hours time in service after 30 June 1977; it’s safety-related and relies on the manufacturer’s service letter for technical details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-45-induction-air-box-seal","history":"/api/acts/ad-cessna-180-45-induction-air-box-seal/history","analysis":"/api/acts/ad-cessna-180-45-induction-air-box-seal/analysis","conflicts":"/api/acts/ad-cessna-180-45-induction-air-box-seal/conflicts","importantCases":"/api/acts/ad-cessna-180-45-induction-air-box-seal/important-cases","documents":"/api/acts/ad-cessna-180-45-induction-air-box-seal/documents"}}